{"id":105246,"date":"2026-09-15T06:56:20","date_gmt":"2026-09-14T22:56:20","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/105246.html"},"modified":"2026-09-15T06:56:20","modified_gmt":"2026-09-14T22:56:20","slug":"guest-%e4%b8%80%e8%b7%91%e5%b0%b1%e5%8d%a1%e6%ad%bb%ef%bc%9fvt-x-amd-v-%e4%bb%8e%e7%89%b9%e6%9d%83%e7%ba%a7%e5%88%b0vm-exit-%e5%8e%9f%e5%9b%a0%e7%a0%81%e4%b8%80%e6%9d%a1%e7%ba%bf%e8%ae%b2%e9%80%8f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/105246.html","title":{"rendered":"Guest \u4e00\u8dd1\u5c31\u5361\u6b7b\uff1fVT-x\/AMD-V \u4ece\u7279\u6743\u7ea7\u5230VM-Exit \u539f\u56e0\u7801\u4e00\u6761\u7ebf\u8bb2\u900f"},"content":{"rendered":"<p>\u865a\u62df\u673a\u542f\u52a8\u540e\u6253\u5b57\u90fd\u5361\u3001perf \u91cc kvm_exit \u5237\u5c4f&#xff1b;\u5d4c\u5957\u573a\u666f L2 \u8fdb\u4e0d\u4e86&#xff1b;\u540c\u955c\u50cf\u5728\u88f8\u673a KVM \u98de\u5feb\u3001\u5728\u67d0\u53f0\u673a\u5668\u4e0a\u5374\u50cf\u7eaf\u4eff\u771f\u2014\u2014\u6839\u56e0\u7ecf\u5e38\u4e0d\u5728\u78c1\u76d8\u955c\u50cf&#xff0c;\u800c\u5728 CPU \u865a\u62df\u5316\u6a21\u5f0f\u9009\u9519\u3001\u7279\u6743\u6307\u4ee4\u62e6\u622a\u8fc7\u5bbd\/\u8fc7\u7a84\u3001VM-Entry \u5931\u8d25\u3001\u6216 Exit \u539f\u56e0\u6ca1\u5bf9\u4e0a\u8bbe\u5907\u6a21\u578b\u3002\u672c\u6587\u6cbf\u4e00\u6761\u4e3b\u7ebf\u8bb2\u900f&#xff1a;\u7279\u6743\u7ea7\u4e0e\u654f\u611f\u6307\u4ee4\u95ee\u9898 \u2192 Intel VT-x \/ AMD-V \u5982\u4f55\u6539\u5199\u6267\u884c\u6a21\u5f0f \u2192 VM-Entry\/VM-Exit \u4e0e\u539f\u56e0\u7801 \u2192 \u62e6\u622a\u63a7\u5236 \u2192 Linux kvm_x86_ops \u5982\u4f55\u62b9\u5e73\u5382\u5546\u5dee\u5f02 \u2192 \u786c\u4ef6\u8f85\u52a9\u5bf9\u6bd4\u4e8c\u8fdb\u5236\u7ffb\u8bd1 \u2192 \u89c2\u6d4b\u4e0e\u6392\u969c\u3002\u8def\u5f84\u5bf9\u9f50 arch\/x86\/kvm\/ \u4e0e Intel SDM \/ AMD APM \u6982\u5ff5&#xff08;\u5bc4\u5b58\u5668\u7ea7\u7ec6\u8282\u4ee5\u5382\u5546\u624b\u518c\u4e3a\u51c6&#xff09;\u3002<\/p>\n<h3>\u9605\u8bfb\u5730\u56fe<\/h3>\n<li>\u7b2c\u4e00\u5c42&#xff1a;\u95ee\u9898\u4ece\u54ea\u6765\u2014\u2014\u89e3\u51b3\u300c\u4e3a\u4f55\u4e0d\u80fd\u76f4\u63a5\u5728 Ring0 \u8dd1 Guest\u3001\u9677\u9631\u4e0e\u6a21\u62df\u7684\u7ecf\u5178\u77db\u76fe\u300d\u3002<\/li>\n<li>\u7b2c\u4e8c\u5c42&#xff1a;\u786c\u4ef6\u8f85\u52a9\u865a\u62df\u5316\u2014\u2014\u89e3\u51b3\u300cVT-x\/AMD-V \u5f15\u5165\u4e86\u4ec0\u4e48\u6a21\u5f0f\u3001VMX root\/non-root \u4e0e Guest\/Host \u72b6\u6001\u5982\u4f55\u5207\u6362\u300d\u3002<\/li>\n<li>\u7b2c\u4e09\u5c42&#xff1a;VM-Entry \/ VM-Exit\u2014\u2014\u89e3\u51b3\u300c\u4f55\u65f6\u8fdb\u5165 Guest\u3001\u4e3a\u4f55\u9000\u51fa\u3001\u539f\u56e0\u7801\u600e\u4e48\u8bfb\u3001\u548c KVM_EXIT_* \u5982\u4f55\u6620\u5c04\u300d\u3002<\/li>\n<li>\u7b2c\u56db\u5c42&#xff1a;\u62e6\u622a\u4e0e kvm_x86_ops\u2014\u2014\u89e3\u51b3\u300c\u63a7\u5236\u54ea\u4e9b\u4e8b\u4ef6\u9000\u51fa\u3001Linux \u5982\u4f55\u7528\u56de\u8c03\u8868\u7edf\u4e00 Intel\/AMD\u300d\u3002<\/li>\n<li>\u7b2c\u4e94\u5c42&#xff1a;\u786c\u4ef6\u8f85\u52a9 vs \u4e8c\u8fdb\u5236\u7ffb\u8bd1\u2014\u2014\u89e3\u51b3\u300cKVM \u4e0e TCG \u5dee\u5728\u54ea\u3001\u4f55\u65f6\u53ea\u80fd\u7528\u7ffb\u8bd1\u300d\u3002<\/li>\n<li>\u7b2c\u516d\u5c42&#xff1a;\u89c2\u6d4b\u4e0e\u6392\u969c\u2014\u2014\u89e3\u51b3\u300cExit \u98ce\u66b4\u3001Entry \u5931\u8d25\u3001\u65e0 vmx \u6807\u5fd7\u3001\u5d4c\u5957\u4e0e\u7279\u6027\u4f4d\u300d\u3002<\/li>\n<h3>\u6e90\u7801\u951a\u70b9<\/h3>\n<table>\n<tr>\u8def\u5f84\u4f5c\u7528<\/tr>\n<tbody>\n<tr>\n<td>arch\/x86\/include\/asm\/kvm_host.h<\/td>\n<td>struct kvm_x86_ops\u3001x86 KVM \u4e3b\u673a\u4fa7\u6838\u5fc3\u58f0\u660e<\/td>\n<\/tr>\n<tr>\n<td>arch\/x86\/kvm\/x86.c<\/td>\n<td>\u516c\u5171 run \u5faa\u73af\u3001MSR\/CR\/CPUID\u3001\u6a21\u5f0f\u5207\u6362\u80f6\u6c34<\/td>\n<\/tr>\n<tr>\n<td>arch\/x86\/kvm\/vmx\/vmx.c<\/td>\n<td>Intel VMX&#xff1a;VMCS \u914d\u7f6e\u3001vmx_handle_exit\u3001Entry<\/td>\n<\/tr>\n<tr>\n<td>arch\/x86\/kvm\/vmx\/vmcs.h \/ vmx\/capabilities.h<\/td>\n<td>VMCS \u5b57\u6bb5\u4e0e\u80fd\u529b<\/td>\n<\/tr>\n<tr>\n<td>arch\/x86\/include\/asm\/vmx.h<\/td>\n<td>Exit reason \u7b49\u5b8f&#xff08;\u5185\u6838\u4fa7&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>arch\/x86\/kvm\/svm\/svm.c<\/td>\n<td>AMD SVM&#xff1a;VMCB\u3001handle_exit\u3001svm_vcpu_run<\/td>\n<\/tr>\n<tr>\n<td>arch\/x86\/include\/asm\/svm.h<\/td>\n<td>SVM Exit code \u7b49<\/td>\n<\/tr>\n<tr>\n<td>arch\/x86\/kvm\/mmu\/<\/td>\n<td>EPT\/NPT \u4e0e\u9875\u9519\u8bef\u76f8\u5173 Exit \u5904\u7406<\/td>\n<\/tr>\n<tr>\n<td>include\/uapi\/linux\/kvm.h<\/td>\n<td>\u7528\u6237\u6001\u53ef\u89c1\u7684 KVM_EXIT_*<\/td>\n<\/tr>\n<tr>\n<td>virt\/kvm\/kvm_main.c<\/td>\n<td>KVM_RUN \u8fdb\u5165\u67b6\u6784\u8def\u5f84\u7684\u603b\u5165\u53e3<\/td>\n<\/tr>\n<tr>\n<td>QEMU accel\/tcg\/<\/td>\n<td>\u4e8c\u8fdb\u5236\u7ffb\u8bd1\u52a0\u901f\u5668\u5bf9\u7167<\/td>\n<\/tr>\n<tr>\n<td>QEMU accel\/kvm\/<\/td>\n<td>\u786c\u4ef6\u8f85\u52a9\u52a0\u901f\u5668<\/td>\n<\/tr>\n<tr>\n<td>Intel SDM Vol.3 \u7684 VMX \u7ae0\u8282<\/td>\n<td>VMCS\u3001Exit reason \u6743\u5a01\u5b9a\u4e49&#xff08;\u4ee5\u624b\u518c\u4e3a\u51c6&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>AMD APM Vol.2 \u7684 SVM \u7ae0\u8282<\/td>\n<td>VMCB\u3001Exit code \u6743\u5a01\u5b9a\u4e49&#xff08;\u4ee5\u624b\u518c\u4e3a\u51c6&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>kvm_x86_ops \u6982\u5ff5\u5f62\u72b6&#xff08;\u5b57\u6bb5\u540d\u968f\u5185\u6838\u6f14\u8fdb&#xff0c;\u4ee5\u672c\u673a\u5934\u6587\u4ef6\u4e3a\u51c6&#xff09;&#xff1a;<\/p>\n<p><span class=\"token comment\">\/* arch\/x86\/include\/asm\/kvm_host.h \u2014 \u903b\u8f91\u6458\u8981 *\/<\/span><br \/>\n<span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_x86_ops<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>hardware_enable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>hardware_disable<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>vcpu_create<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_vcpu<\/span> <span class=\"token operator\">*<\/span>vcpu<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>vcpu_free<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_vcpu<\/span> <span class=\"token operator\">*<\/span>vcpu<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>vcpu_reset<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_vcpu<\/span> <span class=\"token operator\">*<\/span>vcpu<span class=\"token punctuation\">,<\/span> bool init_event<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>vcpu_run<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_vcpu<\/span> <span class=\"token operator\">*<\/span>vcpu<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>          <span class=\"token comment\">\/* \u8fdb Guest *\/<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>handle_exit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_vcpu<\/span> <span class=\"token operator\">*<\/span>vcpu<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/* \u5904\u7406\u9000\u51fa *\/<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>set_rflags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_vcpu<\/span> <span class=\"token operator\">*<\/span>vcpu<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">unsigned<\/span> <span class=\"token keyword\">long<\/span> rflags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">u64<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>get_rflags<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_vcpu<\/span> <span class=\"token operator\">*<\/span>vcpu<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">void<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span>tlb_flush_guest<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_vcpu<\/span> <span class=\"token operator\">*<\/span>vcpu<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/* \u5927\u91cf MSR\/CR\/\u6bb5\/\u5d4c\u5957\/PML \u7b49\u56de\u8c03 \u2026 *\/<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/* \u542f\u52a8\u65f6\u4e8c\u9009\u4e00\u6302\u63a5 *\/<\/span><br \/>\n<span class=\"token keyword\">extern<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_x86_ops<\/span> vmx_x86_ops<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/* vmx.c *\/<\/span><br \/>\n<span class=\"token keyword\">extern<\/span> <span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_x86_ops<\/span> svm_x86_ops<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/* svm.c *\/<\/span><\/p>\n<p>Intel \u9000\u51fa\u539f\u56e0\u5728\u5185\u6838\u4e2d\u7684\u5e38\u7528\u5b8f\u793a\u4f8b&#xff08;\u6570\u503c\u4ee5 asm\/vmx.h \/ SDM \u4e3a\u51c6&#xff09;&#xff1a;<\/p>\n<p><span class=\"token comment\">\/* arch\/x86\/include\/asm\/vmx.h \u2014 \u793a\u610f *\/<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_EXCEPTION_NMI<\/span>        <span class=\"token expression\"><span class=\"token number\">0<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_EXTERNAL_INTERRUPT<\/span>   <span class=\"token expression\"><span class=\"token number\">1<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_TRIPLE_FAULT<\/span>         <span class=\"token expression\"><span class=\"token number\">2<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_CPUID<\/span>                <span class=\"token expression\"><span class=\"token number\">10<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_HLT<\/span>                  <span class=\"token expression\"><span class=\"token number\">12<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_VMCALL<\/span>               <span class=\"token expression\"><span class=\"token number\">18<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_CR_ACCESS<\/span>            <span class=\"token expression\"><span class=\"token number\">28<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_IO_INSTRUCTION<\/span>       <span class=\"token expression\"><span class=\"token number\">30<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_MSR_READ<\/span>             <span class=\"token expression\"><span class=\"token number\">31<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_MSR_WRITE<\/span>            <span class=\"token expression\"><span class=\"token number\">32<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_EPT_VIOLATION<\/span>        <span class=\"token expression\"><span class=\"token number\">48<\/span><\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">EXIT_REASON_EPT_MISCONFIG<\/span>        <span class=\"token expression\"><span class=\"token number\">49<\/span><\/span><\/span><\/p>\n<h3>\u8c03\u7528\u94fe<\/h3>\n<h4>\u4e00\u6b21 KVM_RUN&#xff1a;\u4ece\u7528\u6237\u6001\u5230\u786c\u4ef6\u518d\u56de\u6765<\/h4>\n<p>CPU VT-x\/SVMkvm_x86_opskvm_main \/ x86.cQEMU vCPU \u7ebf\u7a0bCPU VT-x\/SVMkvm_x86_opskvm_main \/ x86.cQEMU vCPU \u7ebf\u7a0b#mermaid-svg-Pwll699noPJn9l0y{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-Pwll699noPJn9l0y .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-Pwll699noPJn9l0y .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-Pwll699noPJn9l0y .error-icon{fill:#552222;}#mermaid-svg-Pwll699noPJn9l0y 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.actor-line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-Pwll699noPJn9l0y .innerArc{stroke-width:1.5;stroke-dasharray:none;}#mermaid-svg-Pwll699noPJn9l0y .messageLine0{stroke-width:1.5;stroke-dasharray:none;stroke:#333;}#mermaid-svg-Pwll699noPJn9l0y .messageLine1{stroke-width:1.5;stroke-dasharray:2,2;stroke:#333;}#mermaid-svg-Pwll699noPJn9l0y #arrowhead path{fill:#333;stroke:#333;}#mermaid-svg-Pwll699noPJn9l0y .sequenceNumber{fill:white;}#mermaid-svg-Pwll699noPJn9l0y #sequencenumber{fill:#333;}#mermaid-svg-Pwll699noPJn9l0y #crosshead path{fill:#333;stroke:#333;}#mermaid-svg-Pwll699noPJn9l0y .messageText{fill:#333;stroke:none;}#mermaid-svg-Pwll699noPJn9l0y .labelBox{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-Pwll699noPJn9l0y .labelText,#mermaid-svg-Pwll699noPJn9l0y .labelText&gt;tspan{fill:black;stroke:none;}#mermaid-svg-Pwll699noPJn9l0y .loopText,#mermaid-svg-Pwll699noPJn9l0y .loopText&gt;tspan{fill:black;stroke:none;}#mermaid-svg-Pwll699noPJn9l0y .loopLine{stroke-width:2px;stroke-dasharray:2,2;stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);}#mermaid-svg-Pwll699noPJn9l0y .note{stroke:#aaaa33;fill:#fff5ad;}#mermaid-svg-Pwll699noPJn9l0y .noteText,#mermaid-svg-Pwll699noPJn9l0y .noteText&gt;tspan{fill:black;stroke:none;}#mermaid-svg-Pwll699noPJn9l0y .activation0{fill:#f4f4f4;stroke:#666;}#mermaid-svg-Pwll699noPJn9l0y .activation1{fill:#f4f4f4;stroke:#666;}#mermaid-svg-Pwll699noPJn9l0y .activation2{fill:#f4f4f4;stroke:#666;}#mermaid-svg-Pwll699noPJn9l0y .actorPopupMenu{position:absolute;}#mermaid-svg-Pwll699noPJn9l0y .actorPopupMenuPanel{position:absolute;fill:#ECECFF;box-shadow:0px 8px 16px 0px rgba(0,0,0,0.2);filter:drop-shadow(3px 5px 2px rgb(0 0 0 \/ 0.4));}#mermaid-svg-Pwll699noPJn9l0y .actor-man line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;}#mermaid-svg-Pwll699noPJn9l0y .actor-man circle,#mermaid-svg-Pwll699noPJn9l0y line{stroke:hsl(259.6261682243, 59.7765363128%, 87.9019607843%);fill:#ECECFF;stroke-width:2px;}#mermaid-svg-Pwll699noPJn9l0y :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}Guest \u6a21\u5f0f\u6267\u884c\u666e\u901a\u6307\u4ee4alt[\u5185\u6838\u53ef\u6d88\u5316][\u9700\u7528\u6237\u6001\u6a21\u62df]ioctl(KVM_RUN)vcpu_run()VMLAUNCH\/VMRESUME \u6216 VMRUNVM-Exit \/handle_exit() \u5206\u53d1\u518d Entry\u586b kvm_run.exit_reason\u8fd4\u56de ioctl\u6a21\u62df PIO\/MMIO\/\u8bbe\u5907<\/p>\n<h4>Exit \u5206\u53d1\u4e0e\u5382\u5546\u62b9\u5e73<\/h4>\n<p>#mermaid-svg-OXvRSlf83UbYlJ8D{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}@keyframes edge-animation-frame{from{stroke-dashoffset:0;}}@keyframes dash{to{stroke-dashoffset:0;}}#mermaid-svg-OXvRSlf83UbYlJ8D .edge-animation-slow{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 50s linear infinite;stroke-linecap:round;}#mermaid-svg-OXvRSlf83UbYlJ8D .edge-animation-fast{stroke-dasharray:9,5!important;stroke-dashoffset:900;animation:dash 20s linear infinite;stroke-linecap:round;}#mermaid-svg-OXvRSlf83UbYlJ8D .error-icon{fill:#552222;}#mermaid-svg-OXvRSlf83UbYlJ8D .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-OXvRSlf83UbYlJ8D .edge-thickness-normal{stroke-width:1px;}#mermaid-svg-OXvRSlf83UbYlJ8D .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-OXvRSlf83UbYlJ8D .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-OXvRSlf83UbYlJ8D .edge-thickness-invisible{stroke-width:0;fill:none;}#mermaid-svg-OXvRSlf83UbYlJ8D .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-OXvRSlf83UbYlJ8D .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-OXvRSlf83UbYlJ8D .marker{fill:#333333;stroke:#333333;}#mermaid-svg-OXvRSlf83UbYlJ8D .marker.cross{stroke:#333333;}#mermaid-svg-OXvRSlf83UbYlJ8D svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-OXvRSlf83UbYlJ8D p{margin:0;}#mermaid-svg-OXvRSlf83UbYlJ8D .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-OXvRSlf83UbYlJ8D .cluster-label text{fill:#333;}#mermaid-svg-OXvRSlf83UbYlJ8D .cluster-label span{color:#333;}#mermaid-svg-OXvRSlf83UbYlJ8D .cluster-label span p{background-color:transparent;}#mermaid-svg-OXvRSlf83UbYlJ8D .label text,#mermaid-svg-OXvRSlf83UbYlJ8D span{fill:#333;color:#333;}#mermaid-svg-OXvRSlf83UbYlJ8D .node rect,#mermaid-svg-OXvRSlf83UbYlJ8D .node circle,#mermaid-svg-OXvRSlf83UbYlJ8D .node ellipse,#mermaid-svg-OXvRSlf83UbYlJ8D .node polygon,#mermaid-svg-OXvRSlf83UbYlJ8D .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-OXvRSlf83UbYlJ8D .rough-node .label text,#mermaid-svg-OXvRSlf83UbYlJ8D .node .label text,#mermaid-svg-OXvRSlf83UbYlJ8D .image-shape .label,#mermaid-svg-OXvRSlf83UbYlJ8D .icon-shape .label{text-anchor:middle;}#mermaid-svg-OXvRSlf83UbYlJ8D .node .katex path{fill:#000;stroke:#000;stroke-width:1px;}#mermaid-svg-OXvRSlf83UbYlJ8D .rough-node .label,#mermaid-svg-OXvRSlf83UbYlJ8D .node .label,#mermaid-svg-OXvRSlf83UbYlJ8D .image-shape .label,#mermaid-svg-OXvRSlf83UbYlJ8D .icon-shape .label{text-align:center;}#mermaid-svg-OXvRSlf83UbYlJ8D .node.clickable{cursor:pointer;}#mermaid-svg-OXvRSlf83UbYlJ8D .root .anchor path{fill:#333333!important;stroke-width:0;stroke:#333333;}#mermaid-svg-OXvRSlf83UbYlJ8D .arrowheadPath{fill:#333333;}#mermaid-svg-OXvRSlf83UbYlJ8D .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-OXvRSlf83UbYlJ8D .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-OXvRSlf83UbYlJ8D .edgeLabel{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-OXvRSlf83UbYlJ8D .edgeLabel p{background-color:rgba(232,232,232, 0.8);}#mermaid-svg-OXvRSlf83UbYlJ8D .edgeLabel rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-OXvRSlf83UbYlJ8D .labelBkg{background-color:rgba(232, 232, 232, 0.5);}#mermaid-svg-OXvRSlf83UbYlJ8D .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-OXvRSlf83UbYlJ8D .cluster text{fill:#333;}#mermaid-svg-OXvRSlf83UbYlJ8D .cluster span{color:#333;}#mermaid-svg-OXvRSlf83UbYlJ8D div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-OXvRSlf83UbYlJ8D .flowchartTitleText{text-anchor:middle;font-size:18px;fill:#333;}#mermaid-svg-OXvRSlf83UbYlJ8D rect.text{fill:none;stroke-width:0;}#mermaid-svg-OXvRSlf83UbYlJ8D .icon-shape,#mermaid-svg-OXvRSlf83UbYlJ8D .image-shape{background-color:rgba(232,232,232, 0.8);text-align:center;}#mermaid-svg-OXvRSlf83UbYlJ8D .icon-shape p,#mermaid-svg-OXvRSlf83UbYlJ8D .image-shape p{background-color:rgba(232,232,232, 0.8);padding:2px;}#mermaid-svg-OXvRSlf83UbYlJ8D .icon-shape rect,#mermaid-svg-OXvRSlf83UbYlJ8D .image-shape rect{opacity:0.5;background-color:rgba(232,232,232, 0.8);fill:rgba(232,232,232, 0.8);}#mermaid-svg-OXvRSlf83UbYlJ8D .label-icon{display:inline-block;height:1em;overflow:visible;vertical-align:-0.125em;}#mermaid-svg-OXvRSlf83UbYlJ8D .node .label-icon path{fill:currentColor;stroke:revert;stroke-width:revert;}#mermaid-svg-OXvRSlf83UbYlJ8D :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/p>\n<p>Intel<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/p>\n<p>AMD<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/p>\n<p>\u662f<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/span><span class=\"edgeLabel\"><\/p>\n<p>\u5426<\/p>\n<p><\/span><span class=\"edgeLabel\"><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u786c\u4ef6 Exit<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u5382\u5546<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>vmx_handle_exit<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>svm handle_exit<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u6309 EXIT_REASON_* \u5206\u652f<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u6309 SVM_EXIT_* \u5206\u652f<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u5b8c\u5168\u5185\u6838\u5904\u7406?<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u66f4\u65b0 vCPU \u72b6\u6001 \/ \u6ce8\u5165\u4e8b\u4ef6<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u518d\u6b21 vcpu_run<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u7ffb\u8bd1\u4e3a KVM_EXIT_IO\/MMIO\/&#8230;<\/p>\n<p><\/span><span class=\"nodeLabel\"><\/p>\n<p>\u8fd4\u56de\u7528\u6237\u6001 VMM<\/p>\n<p><\/span><\/p>\n<hr \/>\n<h3>\u7b2c\u4e00\u5c42&#xff1a;\u95ee\u9898\u4ece\u54ea\u6765\u2014\u2014\u7279\u6743\u7ea7\u4e0e\u300c\u654f\u611f\u6307\u4ee4\u300d<\/h3>\n<h4>1.1 x86 \u7279\u6743\u7ea7\u56de\u987e<\/h4>\n<p>\u4f20\u7edf\u4fdd\u62a4\u6a21\u5f0f\u56db\u7ea7 Ring&#xff1a;<\/p>\n<table>\n<tr>Ring\u5178\u578b\u89d2\u8272\u80fd\u505a\u7684\u4e8b<\/tr>\n<tbody>\n<tr>\n<td>0<\/td>\n<td>\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838<\/td>\n<td>\u6539 CR3\u3001\u5173\u4e2d\u65ad\u3001\u6267\u884c\u7279\u6743\u6307\u4ee4<\/td>\n<\/tr>\n<tr>\n<td>1\u20132<\/td>\n<td>\u5386\u53f2\u6781\u5c11\u7528<\/td>\n<td>\u2014<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>\u7528\u6237\u6001\u5e94\u7528<\/td>\n<td>\u53d7\u95e8\u63a7\u7684\u7cfb\u7edf\u8c03\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u865a\u62df\u5316\u7684\u6838\u5fc3\u77db\u76fe&#xff1a;Guest \u5185\u6838\u4e5f\u8ba4\u4e3a\u81ea\u5df1\u8dd1\u5728 Ring0&#xff0c;\u4f46\u5bbf\u4e3b\u673a\u5185\u6838\u5df2\u7ecf\u5360\u7528 Ring0\u3002\u82e5\u628a Guest \u5185\u6838\u964d\u5230 Ring1\/3&#xff08;\u7ecf\u5178 trap-and-emulate&#xff09;&#xff0c;\u4f1a\u9047\u5230&#xff1a;<\/p>\n<li>\u4e0d\u80fd\u5b8c\u5168\u9677\u5165\u7684\u654f\u611f\u6307\u4ee4&#xff1a;\u6709\u4e9b\u6307\u4ee4\u5728\u975e Ring0 \u4e0d\u89e6\u53d1\u5f02\u5e38&#xff0c;\u5374\u80fd\u8bfb\u5230\u7279\u6743\u72b6\u6001&#xff08;\u5386\u53f2\u4e0a\u7684\u300c\u6f0f\u6d1e\u6307\u4ee4\u300d\u95ee\u9898&#xff09;&#xff1b;<\/li>\n<li>\u6027\u80fd&#xff1a;\u6bcf\u4e2a\u7279\u6743\u884c\u4e3a\u90fd\u5f02\u5e38&#043;\u6a21\u62df&#xff0c;\u5f00\u9500\u5de8\u5927&#xff1b;<\/li>\n<li>\u6b63\u786e\u6027&#xff1a;\u6bb5\u3001\u5206\u9875\u3001\u4e2d\u65ad\u6a21\u578b\u4e0e\u771f\u5b9e Ring0 \u4e0d\u5b8c\u5168\u4e00\u81f4\u3002<\/li>\n<p>\u8fd9\u5c31\u662f\u786c\u4ef6\u8f85\u52a9\u865a\u62df\u5316\u51fa\u73b0\u4e4b\u524d&#xff0c;\u5168\u865a\u62df\u5316\u75db\u82e6\u7684\u6839\u6e90&#xff1b;\u534a\u865a\u62df\u5316&#xff08;\u6539 Guest \u5185\u6838&#xff09;\u548c\u4e8c\u8fdb\u5236\u7ffb\u8bd1&#xff08;\u6539\u6307\u4ee4\u6d41&#xff09;\u662f\u4e24\u6761\u8f6f\u4ef6\u51fa\u8def\u3002<\/p>\n<h4>1.2 \u654f\u611f vs \u7279\u6743<\/h4>\n<ul>\n<li>\u7279\u6743\u6307\u4ee4&#xff1a;\u4ec5\u6700\u9ad8\u7279\u6743\u53ef\u6267\u884c&#xff0c;\u5426\u5219 #GP\u3002<\/li>\n<li>\u654f\u611f\u6307\u4ee4&#xff1a;\u5f71\u54cd\u865a\u62df\u673a\u6b63\u786e\u6027\u6216\u9694\u79bb&#xff0c;\u5374\u672a\u5fc5\u90fd\u89e6\u53d1\u9677\u9631\u3002<\/li>\n<\/ul>\n<p>CPU \u865a\u62df\u5316\u8981\u4fdd\u8bc1&#xff1a;\u6240\u6709\u654f\u611f\u884c\u4e3a\u8981\u4e48\u7531\u786c\u4ef6\u62e6\u622a&#xff0c;\u8981\u4e48\u7531\u7ffb\u8bd1\u5668\u6539\u5199&#xff0c;\u4e0d\u80fd\u9759\u9ed8\u4ee5\u9519\u8bef\u8bed\u4e49\u6267\u884c\u3002<\/p>\n<h4>1.3 \u7ecf\u5178\u4e09\u6761\u6280\u672f\u8def\u7ebf<\/h4>\n<table>\n<tr>\u8def\u7ebf\u505a\u6cd5\u4ee3\u8868<\/tr>\n<tbody>\n<tr>\n<td>\u4fee\u6539 Guest<\/td>\n<td>hypercall \u66ff\u4ee3\u654f\u611f\u64cd\u4f5c<\/td>\n<td>Xen PV<\/td>\n<\/tr>\n<tr>\n<td>\u7ffb\u8bd1\u6307\u4ee4<\/td>\n<td>\u626b\u63cf\u4ee3\u7801\u5757&#xff0c;\u6539\u5199\u654f\u611f\u6307\u4ee4<\/td>\n<td>QEMU TCG\u3001\u65e9\u671f VMware<\/td>\n<\/tr>\n<tr>\n<td>\u786c\u4ef6\u8f85\u52a9<\/td>\n<td>\u65b0 CPU \u6a21\u5f0f &#043; \u63a7\u5236\u5757<\/td>\n<td>VT-x \/ AMD-V &#043; KVM<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5f53\u4ee3\u670d\u52a1\u5668\u9ed8\u8ba4\u7b2c\u4e09\u6761&#xff1b;\u524d\u4e24\u6761\u4ecd\u7528\u4e8e\u65e0\u786c\u4ef6\u3001\u8de8\u67b6\u6784\u4eff\u771f\u3001\u6216\u8c03\u8bd5\u3002<\/p>\n<h4>1.4 \u548c\u5185\u5b58\/IO \u865a\u62df\u5316\u7684\u4ea4\u754c<\/h4>\n<p>CPU \u865a\u62df\u5316\u89e3\u51b3\u300c\u8c01\u5728\u8dd1\u6307\u4ee4\u300d&#xff1b;\u5185\u5b58\u9760\u4e8c\u7ea7\u9875\u8868&#xff08;Intel EPT \/ AMD NPT&#xff09;&#xff1b;IO \u9760\u62e6\u622a\u6216\u76f4\u901a&#xff08;VFIO&#xff09;\u3002\u4e09\u8005\u5728 Exit \u539f\u56e0\u4e0a\u4ea4\u6c47&#xff1a;\u4f8b\u5982 EPT violation \u662f MMU \u95ee\u9898&#xff0c;\u5374\u8868\u73b0\u4e3a\u4e00\u6b21 CPU Exit\u3002\u672c\u6587\u805a\u7126 CPU \u63a7\u5236\u6d41&#xff0c;\u9875\u8868\u7ec6\u8282\u70b9\u5230\u5373\u6b62\u3002<\/p>\n<hr \/>\n<h3>\u7b2c\u4e8c\u5c42&#xff1a;\u786c\u4ef6\u8f85\u52a9\u2014\u2014VT-x \u4e0e AMD-V \u6539\u5199\u4e86\u4ec0\u4e48<\/h3>\n<h4>2.1 Intel VT-x&#xff1a;VMX root \/ non-root<\/h4>\n<p>Intel \u5f15\u5165 VMX \u64cd\u4f5c&#xff1a;<\/p>\n<ul>\n<li>VMX root&#xff1a;\u5bbf\u4e3b\u673a\u5185\u6838&#xff08;VMM&#xff09;\u8fd0\u884c\u7684\u73af\u5883&#xff0c;\u53ef\u6267\u884c VMXON\u3001\u914d\u7f6e VMCS\u3001\u53d1\u8d77 Entry&#xff1b;<\/li>\n<li>VMX non-root&#xff1a;Guest \u8fd0\u884c\u73af\u5883&#xff1b;\u654f\u611f\u4e8b\u4ef6\u6309 VMCS \u63a7\u5236\u89e6\u53d1 VM-Exit \u56de\u5230 root\u3002<\/li>\n<\/ul>\n<p>\u5173\u952e\u6307\u4ee4&#xff08;\u540d\u79f0\u4ee5 SDM \u4e3a\u51c6&#xff09;&#xff1a;<\/p>\n<table>\n<tr>\u6307\u4ee4\u4f5c\u7528<\/tr>\n<tbody>\n<tr>\n<td>VMXON<\/td>\n<td>\u6253\u5f00 VMX \u64cd\u4f5c<\/td>\n<\/tr>\n<tr>\n<td>VMXOFF<\/td>\n<td>\u5173\u95ed<\/td>\n<\/tr>\n<tr>\n<td>VMPTRLD<\/td>\n<td>\u52a0\u8f7d\u5f53\u524d VMCS \u6307\u9488<\/td>\n<\/tr>\n<tr>\n<td>VMREAD\/VMWRITE<\/td>\n<td>\u8bfb\u5199 VMCS \u5b57\u6bb5<\/td>\n<\/tr>\n<tr>\n<td>VMLAUNCH<\/td>\n<td>\u9996\u6b21\u8fdb\u5165 Guest<\/td>\n<\/tr>\n<tr>\n<td>VMRESUME<\/td>\n<td>\u518d\u6b21\u8fdb\u5165 Guest<\/td>\n<\/tr>\n<tr>\n<td>VMCALL<\/td>\n<td>Guest \u4e3b\u52a8\u547c\u53eb VMM&#xff08;\u53ef\u914d\u7f6e&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Linux \u5728\u52a0\u8f7d kvm_intel \u4e14 hardware_enable \u65f6\u5bf9\u6bcf\u4e2a CPU \u505a VMXON&#xff1b;\u6bcf\u4e2a vCPU \u7ed1\u5b9a VMCS\u3002<\/p>\n<h4>2.2 AMD-V&#xff1a;SVM<\/h4>\n<p>AMD \u7528 SVM&#xff0c;\u6838\u5fc3\u6307\u4ee4 VMRUN \u52a0\u8f7d VMCB \u8fdb\u5165 Guest&#xff1b;\u9000\u51fa\u79f0 #VMEXIT\u3002\u62e6\u622a\u4f4d\u5728 VMCB \u63a7\u5236\u533a\u914d\u7f6e&#xff0c;\u8bed\u4e49\u4e0e Intel \u76f8\u8fd1\u4f46\u7f16\u7801\u4e0d\u540c\u3002Linux \u5bf9\u5e94\u6a21\u5757 kvm_amd\u3002<\/p>\n<h4>2.3 Guest \u72b6\u6001\u4e0e Host \u72b6\u6001<\/h4>\n<p>\u65e0\u8bba VMCS \u8fd8\u662f VMCB&#xff0c;\u90fd\u8981\u4fdd\u5b58\u4e24\u5957\u4e0a\u4e0b\u6587&#xff1a;<\/p>\n<ul>\n<li>Guest state&#xff1a;Guest \u7684 RIP\u3001RSP\u3001RFLAGS\u3001CR0\/CR3\/CR4\u3001\u6bb5\u5bc4\u5b58\u5668\u3001\u90e8\u5206 MSR\u2026<\/li>\n<li>Host state&#xff1a;Exit \u540e\u7acb\u523b\u6062\u590d\u7684 Host \u5185\u6838\u4e0a\u4e0b\u6587&#xff0c;\u4fdd\u8bc1 VMM \u4ece\u786e\u5b9a\u70b9\u7ee7\u7eed\u8dd1\u3002<\/li>\n<\/ul>\n<p>\u53e6\u5916\u8fd8\u6709 \u63a7\u5236\u5b57\u6bb5&#xff1a;\u5f02\u5e38 bitmap\u3001CR \u63a9\u7801\u3001IO bitmap\u3001MSR bitmap\u3001\u4e8c\u7ea7\u9875\u8868\u6307\u9488\u3001\u4e2d\u65ad\u865a\u62df\u5316\u5f00\u5173\u7b49\u3002KVM \u7684\u5927\u91cf\u4ee3\u7801\u662f\u5728\u300c\u6309\u7b56\u7565\u5199\u8fd9\u4e9b\u63a7\u5236\u5b57\u6bb5\u300d\u4e0e\u300cExit \u540e\u8bfb\u539f\u56e0\u5b57\u6bb5\u300d\u3002<\/p>\n<h4>2.4 \u6a21\u5f0f\u5207\u6362\u7684\u76f4\u89c2\u6a21\u578b<\/h4>\n<p>[ Host Ring0, VMX root ]<br \/>\n        | VMLAUNCH\/VMRESUME<br \/>\n        v<br \/>\n[ Guest \u4ee5\u4e3a\u81ea\u5df1 Ring0, \u5b9e\u9645 non-root ]<br \/>\n        | \u654f\u611f\u4e8b\u4ef6<br \/>\n        v<br \/>\n[ VM-Exit \u2192 \u56de\u5230 Host root&#xff0c;\u8bfb exit reason ]<br \/>\n        | \u5904\u7406\u5b8c<br \/>\n        v<br \/>\n[ \u518d VMRESUME \u2026 ]<\/p>\n<p>Guest \u770b\u4e0d\u5230\u300c\u81ea\u5df1\u5728 non-root\u300d\u2014\u2014\u9664\u975e\u66b4\u9732\u4e86 hypervisor \u53f6\u5b50 CPUID \u6216\u901a\u8fc7\u65f6\u5e8f\u4fa7\u4fe1\u9053&#xff0c;\u90a3\u662f\u5b89\u5168\u8bdd\u9898\u3002<\/p>\n<h4>2.5 \u6a21\u5757\u4e0e CPUID \u6807\u5fd7<\/h4>\n<p><span class=\"token function\">grep<\/span> <span class=\"token parameter variable\">-E<\/span> <span class=\"token string\">&#039;vmx|svm&#039;<\/span> \/proc\/cpuinfo<br \/>\nlsmod <span class=\"token operator\">|<\/span> <span class=\"token function\">egrep<\/span> <span class=\"token string\">&#039;kvm_intel|kvm_amd&#039;<\/span><br \/>\n<span class=\"token function\">dmesg<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> <span class=\"token parameter variable\">-iE<\/span> <span class=\"token string\">&#039;VMX|SVM|kvm&#039;<\/span><\/p>\n<p>\u65e0\u6807\u5fd7\u65f6&#xff0c;\u8f6f\u4ef6\u518d\u52aa\u529b\u4e5f\u65e0\u6cd5\u8d70\u786c\u4ef6\u8f85\u52a9\u8def\u5f84&#xff08;\u9664\u975e\u662f\u5d4c\u5957\u91cc\u7236\u7ea7\u6ca1\u628a\u6807\u5fd7\u4f20\u4e0b\u6765&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u7b2c\u4e09\u5c42&#xff1a;VM-Entry \/ VM-Exit\u2014\u2014\u8fdb\u5165\u3001\u9000\u51fa\u4e0e\u539f\u56e0\u7801<\/h3>\n<h4>3.1 VM-Entry \u505a\u4ec0\u4e48<\/h4>\n<p>Entry \u5927\u81f4\u5305\u62ec&#xff08;\u6982\u5ff5\u5e8f&#xff0c;\u7ec6\u8282\u4ee5\u624b\u518c\u4e3a\u51c6&#xff09;&#xff1a;<\/p>\n<li>\u68c0\u67e5 VMCS\/VMCB \u4e00\u81f4\u6027&#xff08;\u5931\u8d25\u5219 Entry \u5931\u8d25&#xff0c;\u7559\u5728 Host&#xff09;&#xff1b;<\/li>\n<li>\u52a0\u8f7d Guest \u72b6\u6001&#xff1b;<\/li>\n<li>\u6309\u63a7\u5236\u4f4d\u6b66\u88c5\u62e6\u622a&#xff1b;<\/li>\n<li>\u8df3\u5230 Guest RIP \u7ee7\u7eed\u6267\u884c\u3002<\/li>\n<p>KVM \u5728 Entry \u524d\u8fd8\u4f1a\u5904\u7406&#xff1a;\u5f85\u6ce8\u5165\u4e8b\u4ef6\u3001MMU \u540c\u6b65\u3001\u8bf7\u6c42\u7684\u65f6\u949f\u66f4\u65b0\u7b49\u3002x86.c \u7684 run \u8def\u5f84\u4e0a\u6709\u4e00\u4e32 vcpu-&gt;requests \u4f4d\u3002<\/p>\n<h4>3.2 Entry \u5931\u8d25 vs Exit<\/h4>\n<table>\n<tr>\u7c7b\u578b\u542b\u4e49\u5178\u578b\u8868\u73b0<\/tr>\n<tbody>\n<tr>\n<td>VM-Entry failure<\/td>\n<td>\u6ca1\u80fd\u8fdb\u5165 Guest<\/td>\n<td>\u9519\u8bef\u7801\u5728 VMCS&#xff1b;KVM \u6253\u65e5\u5fd7 \/ \u8fd4\u56de\u9519\u8bef<\/td>\n<\/tr>\n<tr>\n<td>VM-Exit<\/td>\n<td>\u8fdb\u5165\u540e\u53c8\u51fa\u6765<\/td>\n<td>\u6b63\u5e38\u8def\u5f84&#xff1b;\u6309 reason \u5904\u7406<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6392\u969c\u65f6\u4e8c\u8005\u4e0d\u53ef\u6df7\u6dc6&#xff1a;\u524d\u8005\u662f\u914d\u7f6e\/\u72b6\u6001\u673a\u9519\u8bef&#xff1b;\u540e\u8005\u662f\u9884\u671f\u7684\u62e6\u622a\u6216\u5916\u90e8\u4e8b\u4ef6\u3002<\/p>\n<h4>3.3 \u5e38\u89c1 Exit \u539f\u56e0&#xff08;\u5de5\u7a0b\u9ad8\u9891&#xff09;<\/h4>\n<table>\n<tr>\u539f\u56e0\u7c7b\u4f8b\u5b50KVM\/QEMU \u5e38\u89c1\u540e\u7eed<\/tr>\n<tbody>\n<tr>\n<td>\u6307\u4ee4\u62e6\u622a<\/td>\n<td>CPUID\u3001HLT\u3001IN\/OUT\u3001RDMSR\/WRMSR<\/td>\n<td>\u6a21\u62df\u6216\u77ed\u8def<\/td>\n<\/tr>\n<tr>\n<td>\u63a7\u5236\u5bc4\u5b58\u5668<\/td>\n<td>CR3 \u5207\u6362\u3001CR0 \u66f4\u65b0<\/td>\n<td>MMU \/ \u6a21\u5f0f\u5904\u7406<\/td>\n<\/tr>\n<tr>\n<td>\u5f02\u5e38\/NMI<\/td>\n<td>\u53ef\u914d\u7f6e\u54ea\u4e9b\u5f02\u5e38 Exit<\/td>\n<td>\u6ce8\u5165\u6216\u6a21\u62df<\/td>\n<\/tr>\n<tr>\n<td>\u5916\u90e8\u4e2d\u65ad<\/td>\n<td>Host \u4e2d\u65ad\u62a2\u5360<\/td>\n<td>Host \u5904\u7406\u5b8c\u518d Entry<\/td>\n<\/tr>\n<tr>\n<td>\u5185\u5b58<\/td>\n<td>EPT violation \/ misconfig<\/td>\n<td>\u8865\u9875\u3001MMIO\u3001\u6216\u9519\u8bef<\/td>\n<\/tr>\n<tr>\n<td>\u4e09\u500d\u6545\u969c<\/td>\n<td>Guest \u5d29\u574f<\/td>\n<td>KVM_EXIT_SHUTDOWN \u7b49<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3.4 \u786c\u4ef6 reason \u2192 KVM_EXIT_*<\/h4>\n<p>\u7528\u6237\u6001 \u4e0d\u8981 \u5047\u8bbe\u786c\u4ef6 Exit reason \u6570\u503c\u7b49\u4e8e kvm_run.exit_reason\u3002KVM \u505a\u4e86\u7a33\u5b9a ABI \u7ffb\u8bd1&#xff0c;\u4f8b\u5982&#xff1a;<\/p>\n<ul>\n<li>IO \u6307\u4ee4 Exit \u2192 KVM_EXIT_IO&#xff08;\u5e26 port\/size\/direction&#xff09;&#xff1b;<\/li>\n<li>\u67d0\u7c7b MMIO \u2192 KVM_EXIT_MMIO&#xff1b;<\/li>\n<li>HLT \u2192 KVM_EXIT_HLT&#xff1b;<\/li>\n<li>\u5f88\u591a EPT violation \u82e5\u5bf9\u5e94\u666e\u901a RAM \u7f3a\u9875&#xff0c;\u53ef\u80fd\u5728\u5185\u6838\u6d88\u5316&#xff0c;\u7528\u6237\u6001\u6839\u672c\u770b\u4e0d\u89c1\u3002<\/li>\n<\/ul>\n<p>\u56e0\u6b64&#xff1a;<\/p>\n<ul>\n<li>\u770b \u786c\u4ef6\/KVM \u5185\u90e8 \u7528 tracepoint:kvm:kvm_exit\u3001perf kvm&#xff1b;<\/li>\n<li>\u770b \u7528\u6237\u6001\u5f80\u8fd4 \u7528 QEMU \u65e5\u5fd7\u6216\u5bf9 KVM_RUN \u8fd4\u56de\u540e\u7684 exit_reason \u8ba1\u6570\u3002<\/li>\n<\/ul>\n<h4>3.5 \u9000\u51fa\u8d44\u683c\u5b57\u6bb5&#xff08;qualification&#xff09;<\/h4>\n<p>\u4ec5\u6709 reason \u4e0d\u591f\u3002\u4f8b\u5982 IO Exit \u8981\u77e5\u9053\u7aef\u53e3\u4e0e\u65b9\u5411&#xff1b;CR Access \u8981\u77e5\u9053\u54ea\u4e2a CR\u3001\u662f mov \u8fd8\u662f clts\u3002Intel \u628a\u7ec6\u8282\u653e\u5728 Exit qualification \u7b49\u5b57\u6bb5&#xff1b;AMD \u6709\u5bf9\u5e94\u7684 EXITINFO\u3002vmx_handle_exit \/ SVM \u5904\u7406\u51fd\u6570\u4f1a\u89e3\u7801\u8fd9\u4e9b\u5b57\u6bb5\u518d\u5206\u652f\u3002<\/p>\n<h4>3.6 \u4e2d\u65ad\u7a97\u53e3\u4e0e\u6ce8\u5165<\/h4>\n<p>\u865a\u62df\u4e2d\u65ad\u4e0d\u80fd\u968f\u65f6\u585e\u8fdb Guest&#xff0c;\u9700\u5728\u300c\u53ef\u63a5\u6536\u4e2d\u65ad\u300d\u7684\u7a97\u53e3\u6ce8\u5165\u3002\u4e8e\u662f\u6709&#xff1a;<\/p>\n<ul>\n<li>interrupt-window exiting&#xff1b;<\/li>\n<li>KVM_EXIT_IRQ_WINDOW_OPEN&#xff08;\u7528\u6237\u6001 irqchip \u573a\u666f\u66f4\u5e38\u89c1&#xff09;&#xff1b;<\/li>\n<li>\u5185\u6838 irqchip \u5219\u591a\u5728\u5185\u6838\u5b8c\u6210\u6ce8\u5165&#xff0c;\u51cf\u5c11\u5f80\u8fd4\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u662f\u300cGuest \u6536\u4e0d\u5230\u4e2d\u65ad\u300d\u7c7b\u95ee\u9898\u7684 CPU \u4fa7\u673a\u5236\u70b9\u3002<\/p>\n<hr \/>\n<h3>\u7b2c\u56db\u5c42&#xff1a;\u62e6\u622a\u63a7\u5236\u4e0e kvm_x86_ops<\/h3>\n<h4>4.1 \u62e6\u622a &#061; \u53ef\u7f16\u7a0b\u7684\u300c\u654f\u611f\u5217\u8868\u300d<\/h4>\n<p>VMM \u901a\u8fc7 VMCS\/VMCB \u63a7\u5236\u4f4d\u51b3\u5b9a&#xff1a;<\/p>\n<ul>\n<li>\u54ea\u4e9b\u5f02\u5e38\u5bfc\u81f4 Exit&#xff1b;<\/li>\n<li>\u662f\u5426\u62e6\u622a\u6240\u6709 IO \u6216\u6309 IO bitmap&#xff1b;<\/li>\n<li>MSR bitmap \u4e2d\u54ea\u4e9b MSR \u8bfb\u5199 Exit&#xff1b;<\/li>\n<li>\u662f\u5426\u62e6\u622a HLT\u3001PAUSE\u3001CPUID&#xff1b;<\/li>\n<li>\u4e8c\u7ea7\u9875\u8868\u6307\u9488\u4e0e EPT\/NPT \u5f00\u5173\u3002<\/li>\n<\/ul>\n<p>\u7b56\u7565\u8fc7\u5bbd \u2192 Exit \u98ce\u66b4 \u2192 \u6162&#xff1b;\u7b56\u7565\u8fc7\u7a84 \u2192 Guest \u884c\u4e3a\u4e0d\u6b63\u786e\u6216\u7834\u574f\u9694\u79bb\u3002KVM \u7684\u9ed8\u8ba4\u7b56\u7565\u662f\u300c\u6b63\u786e\u4f18\u5148&#xff0c;\u518d\u5bf9\u70ed\u70b9\u505a\u4f18\u5316&#xff08;\u5982 halt polling\u3001\u6b22\u4e50\u8033\u5149 dirty log \u7b49&#xff09;\u300d\u3002<\/p>\n<h4>4.2 \u4e3a\u4f55\u9700\u8981 kvm_x86_ops<\/h4>\n<p>Intel \u4e0e AMD \u7684&#xff1a;<\/p>\n<ul>\n<li>\u6307\u4ee4\u4e0d\u540c&#xff08;VMRESUME vs VMRUN&#xff09;&#xff1b;<\/li>\n<li>\u63a7\u5236\u5757\u5e03\u5c40\u4e0d\u540c&#xff1b;<\/li>\n<li>Exit \u7f16\u7801\u4e0d\u540c&#xff1b;<\/li>\n<li>\u90e8\u5206\u7279\u6027&#xff08;APICv vs AVIC\u3001PML \u7b49&#xff09;\u4e0d\u5bf9\u79f0\u3002<\/li>\n<\/ul>\n<p>\u82e5 x86.c \u5230\u5904 #ifdef&#xff0c;\u5c06\u4e0d\u53ef\u7ef4\u62a4\u3002\u4e8e\u662f\u7528 \u51fd\u6570\u8868 kvm_x86_ops&#xff1a;\u516c\u5171\u903b\u8f91\u53ea\u8c03 kvm_x86_ops.vcpu_run() \u7b49&#xff0c;\u5382\u5546\u6587\u4ef6\u5b9e\u73b0\u5177\u4f53\u51fd\u6570\u3002<\/p>\n<p>\u52a0\u8f7d\u65f6&#xff1a;<\/p>\n<p>\u63a2\u6d4b CPUID.1.ECX.VMX \u6216 CPUID.8000_0001.ECX.SVM<br \/>\n  \u2192 \u6ce8\u518c vmx_x86_ops \u6216 svm_x86_ops<br \/>\n  \u2192 hardware_enable \u5728\u6bcf\u4e2a CPU \u4e0a\u6253\u5f00 VMX\/SVM<\/p>\n<p>\u4e92\u65a5&#xff1a;\u540c\u4e00\u7cfb\u7edf\u901a\u5e38\u53ea\u52a0\u8f7d kvm_intel \u6216 kvm_amd \u4e4b\u4e00\u3002<\/p>\n<h4>4.3 handle_exit \u5206\u53d1\u9aa8\u67b6&#xff08;\u6982\u5ff5&#xff09;<\/h4>\n<p><span class=\"token comment\">\/* \u6982\u5ff5\u4f2a\u4ee3\u7801&#xff0c;\u975e\u76f4\u63a5\u7c98\u8d34\u67d0\u4e00\u7248\u884c\u53f7 *\/<\/span><br \/>\n<span class=\"token keyword\">int<\/span> <span class=\"token function\">vmx_handle_exit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">kvm_vcpu<\/span> <span class=\"token operator\">*<\/span>vcpu<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    u32 reason <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">vmx_get_exit_reason<\/span><span class=\"token punctuation\">(<\/span>vcpu<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>reason <span class=\"token operator\">&#061;&#061;<\/span> EXIT_REASON_FAILED_VMENTRY<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">handle_entry_failure<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>reason<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> EXIT_REASON_CPUID<span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">kvm_emulate_cpuid<\/span><span class=\"token punctuation\">(<\/span>vcpu<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> EXIT_REASON_IO_INSTRUCTION<span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">handle_io<\/span><span class=\"token punctuation\">(<\/span>vcpu<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> EXIT_REASON_MSR_READ<span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> EXIT_REASON_MSR_WRITE<span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> handle_rd<span class=\"token operator\">\/<\/span><span class=\"token function\">wrmsr<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> EXIT_REASON_EPT_VIOLATION<span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">handle_ept_violation<\/span><span class=\"token punctuation\">(<\/span>vcpu<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> EXIT_REASON_HLT<span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">kvm_emulate_halt<\/span><span class=\"token punctuation\">(<\/span>vcpu<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/* &#8230; *\/<\/span><br \/>\n    <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token operator\">&#8211;<\/span>EFAULT<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/* \u6216\u6ce8\u5165\u5f02\u5e38 \/ \u7528\u6237\u6001\u9000\u51fa *\/<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u80fd\u6a21\u62df\u5b8c\u4e14 Guest \u53ef\u7ee7\u7eed \u2192 \u8fd4\u56de\u300c\u518d\u8dd1\u300d&#xff1b;\u9700\u8981 QEMU \u2192 \u8bbe\u7f6e vcpu-&gt;run-&gt;exit_reason \u5e76\u9000\u51fa\u5230 kvm_main\u3002<\/p>\n<h4>4.4 \u4eff\u771f\u5668\u4e0e\u300c\u518d\u6267\u884c\u300d<\/h4>\n<p>\u90e8\u5206 Exit \u7528\u5185\u6838\u6307\u4ee4\u4eff\u771f\u5668&#xff08;arch\/x86\/kvm\/emulate.c \u76f8\u5173\u8def\u5f84&#xff09;\u89e3\u7801 Guest \u6307\u4ee4\u5e76\u6a21\u62df&#xff0c;\u7136\u540e\u63a8\u8fdb RIP\u3002\u8fd9\u4e0e\u6574\u5757\u4e8c\u8fdb\u5236\u7ffb\u8bd1\u4e0d\u540c&#xff1a;\u53ea\u5bf9 \u89e6\u53d1 Exit \u7684\u90a3\u4e00\u5c0f\u6bb5 \u4eff\u771f\u3002<\/p>\n<h4>4.5 \u5d4c\u5957\u865a\u62df\u5316\u65f6\u7684\u300c\u62e6\u622a\u7684\u62e6\u622a\u300d<\/h4>\n<p>L1 \u81ea\u5df1\u53c8\u662f\u4e2a Hypervisor \u65f6&#xff0c;L0 \u7684 KVM \u8981\u5b9e\u73b0 \u5d4c\u5957 VMX\/SVM&#xff1a;\u628a L1 \u5bf9 L2 \u7684 VMCS \u64cd\u4f5c\u53d8\u6210\u5bf9 L0 \u63a7\u5236\u5757\u7684\u5408\u6210\u3002\u4ee3\u7801\u8def\u5f84\u660e\u663e\u66f4\u957f&#xff08;vmx\/nested.c\u3001svm\/nested.c \u4e00\u7c7b&#xff09;\u3002Exit \u4f1a\u591a\u4e00\u8df3&#xff0c;\u6027\u80fd\u654f\u611f\u8d1f\u8f7d\u614e\u7528\u5d4c\u5957\u3002<\/p>\n<hr \/>\n<h3>\u7b2c\u4e94\u5c42&#xff1a;\u786c\u4ef6\u8f85\u52a9 vs \u4e8c\u8fdb\u5236\u7ffb\u8bd1<\/h3>\n<h4>5.1 QEMU TCG \u5728\u505a\u4ec0\u4e48<\/h4>\n<p>TCG&#xff08;Tiny Code Generator&#xff09;\u628a Guest \u57fa\u672c\u5757\u7ffb\u8bd1\u6210 Host \u53ef\u6267\u884c\u4ee3\u7801\u5e76\u7f13\u5b58&#xff1a;<\/p>\n<p>Guest TB \u626b\u63cf<br \/>\n  \u2192 \u654f\u611f\u6307\u4ee4\u53d8\u6210 helper \u8c03\u7528<br \/>\n  \u2192 \u751f\u6210 Host \u673a\u5668\u7801<br \/>\n  \u2192 \u67e5 TB \u7f13\u5b58\u547d\u4e2d\u5219\u76f4\u63a5\u8dd1<\/p>\n<p>\u65e0 VT-x \u4e5f\u80fd\u8dd1\u4efb\u610f\u67b6\u6784 Guest&#xff08;\u5982\u5728 x86 \u4e0a\u8dd1 ARM&#xff09;&#xff0c;\u8fd9\u662f KVM \u505a\u4e0d\u5230\u7684&#xff08;KVM \u8981\u6c42 Guest \u4e0e Host \u540c\u67b6\u6784\u65cf&#xff0c;\u4e14\u6709\u786c\u4ef6\u865a\u62df\u5316&#xff09;\u3002<\/p>\n<h4>5.2 \u5bf9\u6bd4\u8868<\/h4>\n<table>\n<tr>\u7ef4\u5ea6KVM&#xff08;\u786c\u4ef6\u8f85\u52a9&#xff09;TCG&#xff08;\u4e8c\u8fdb\u5236\u7ffb\u8bd1&#xff09;<\/tr>\n<tbody>\n<tr>\n<td>\u4f9d\u8d56<\/td>\n<td>CPU VT-x\/AMD-V &#043; kvm<\/td>\n<td>\u65e0\u7279\u6b8a\u786c\u4ef6<\/td>\n<\/tr>\n<tr>\n<td>\u666e\u901a\u6307\u4ee4<\/td>\n<td>\u539f\u751f\u6267\u884c<\/td>\n<td>\u7ffb\u8bd1\u6267\u884c<\/td>\n<\/tr>\n<tr>\n<td>\u654f\u611f\u63a7\u5236<\/td>\n<td>VMCS\/VMCB \u62e6\u622a<\/td>\n<td>\u7ffb\u8bd1\u65f6\u63d2\u5165\u68c0\u67e5<\/td>\n<\/tr>\n<tr>\n<td>\u8de8\u67b6\u6784<\/td>\n<td>\u5426&#xff08;\u540c\u67b6\u6784&#xff09;<\/td>\n<td>\u662f<\/td>\n<\/tr>\n<tr>\n<td>\u5178\u578b\u6027\u80fd<\/td>\n<td>\u9ad8&#xff08;Exit \u5c11\u65f6\u8fd1\u88f8\u673a&#xff09;<\/td>\n<td>\u4f4e\u5230\u4e2d<\/td>\n<\/tr>\n<tr>\n<td>\u8c03\u8bd5<\/td>\n<td>\u9700\u7406\u89e3 Exit<\/td>\n<td>\u53ef\u66f4\u7ec6\u63d2\u6869<\/td>\n<\/tr>\n<tr>\n<td>\u4ee3\u8868\u547d\u4ee4<\/td>\n<td>-accel kvm<\/td>\n<td>-accel tcg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>5.3 \u6df7\u5408\u4e0e\u8bef\u533a<\/h4>\n<ul>\n<li>\u300c\u5f00\u4e86 KVM \u5c31\u4e0d\u4f1a\u6709\u7ffb\u8bd1\u300d&#xff1a;\u8bbe\u5907\u6a21\u578b\u4ecd\u662f\u8f6f\u4ef6&#xff1b;\u53ea\u6709 CPU \u4e3b\u8def\u5f84\u786c\u4ef6\u5316\u3002<\/li>\n<li>\u300cTCG \u4e00\u5b9a\u4e0d\u7528 Exit\u300d&#xff1a;TCG \u65e0 VM-Exit&#xff0c;\u4f46\u6709 TB \u94fe\u65ad\u88c2\u3001helper \u8c03\u7528&#xff0c;\u5f00\u9500\u5f62\u6001\u4e0d\u540c\u3002<\/li>\n<li>\u300c\u65e0 kvm \u6a21\u5757\u8fd8\u80fd -accel kvm\u300d&#xff1a;\u4e0d\u80fd&#xff1b;\u5e94\u663e\u5f0f\u56de\u843d\u6216\u62a5\u9519&#xff0c;\u4e0d\u8981\u5047\u8bbe\u9759\u9ed8\u6210\u529f\u3002<\/li>\n<\/ul>\n<h4>5.4 \u9009\u578b\u5efa\u8bae&#xff08;\u5de5\u7a0b&#xff09;<\/h4>\n<ul>\n<li>\u751f\u4ea7\u540c\u67b6\u6784\u4e91\u4e3b\u673a \/ \u672c\u5730\u684c\u9762\u865a\u62df\u5316&#xff1a;KVM\u3002<\/li>\n<li>CI \u91cc\u5d4c\u5957\u53d7\u9650\u6216\u67b6\u6784\u4eff\u771f&#xff1a;TCG \u6216\u4e91\u5d4c\u5957\u5f00\u5173\u3002<\/li>\n<li>\u6027\u80fd\u6d4b\u8bd5&#xff1a;\u6c38\u8fdc\u5148\u786e\u8ba4 accel&#xff0c;\u518d\u8c08\u53c2\u6570\u8c03\u4f18\u3002<\/li>\n<\/ul>\n<p>qemu-system-x86_64 <span class=\"token parameter variable\">-accel<\/span> <span class=\"token builtin class-name\">help<\/span><br \/>\n<span class=\"token comment\"># \u5bf9\u6bd4&#xff1a;<\/span><br \/>\nqemu-system-x86_64 <span class=\"token parameter variable\">-accel<\/span> kvm <span class=\"token parameter variable\">-cpu<\/span> <span class=\"token function\">host<\/span> <span class=\"token punctuation\">..<\/span>.<br \/>\nqemu-system-x86_64 <span class=\"token parameter variable\">-accel<\/span> tcg,thread<span class=\"token operator\">&#061;<\/span>multi <span class=\"token parameter variable\">-cpu<\/span> qemu64 <span class=\"token punctuation\">..<\/span>.<\/p>\n<hr \/>\n<h3>\u7b2c\u516d\u5c42&#xff1a;\u89c2\u6d4b\u4e0e\u6392\u969c<\/h3>\n<h4>6.1 \u786e\u8ba4\u8d70\u5728\u786c\u4ef6\u8def\u5f84\u4e0a<\/h4>\n<p><span class=\"token function\">grep<\/span> <span class=\"token parameter variable\">-E<\/span> <span class=\"token string\">&#039;vmx|svm&#039;<\/span> \/proc\/cpuinfo<br \/>\n<span class=\"token function\">ls<\/span> <span class=\"token parameter variable\">-l<\/span> \/dev\/kvm<br \/>\n<span class=\"token function\">tr<\/span> <span class=\"token string\">&#039;\\\\0&#039;<\/span> <span class=\"token string\">&#039;\\\\n&#039;<\/span> <span class=\"token operator\">&lt;<\/span> \/proc\/<span class=\"token variable\"><span class=\"token variable\">$(<\/span>pidof qemu-system-x86_64<span class=\"token variable\">)<\/span><\/span>\/cmdline <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> <span class=\"token parameter variable\">-E<\/span> <span class=\"token string\">&#039;accel|enable-kvm&#039;<\/span><br \/>\n<span class=\"token function\">sudo<\/span> <span class=\"token function\">dmesg<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> <span class=\"token parameter variable\">-i<\/span> kvm <span class=\"token operator\">|<\/span> <span class=\"token function\">tail<\/span><\/p>\n<h4>6.2 \u770b Exit \u5206\u5e03<\/h4>\n<p><span class=\"token comment\"># perf<\/span><br \/>\n<span class=\"token function\">sudo<\/span> perf kvm <span class=\"token function\">stat<\/span> <span class=\"token parameter variable\">-p<\/span> <span class=\"token variable\"><span class=\"token variable\">$(<\/span>pidof qemu-system-x86_64<span class=\"token variable\">)<\/span><\/span> <span class=\"token function\">sleep<\/span> <span class=\"token number\">5<\/span><\/p>\n<p><span class=\"token comment\"># tracepoint \u805a\u5408&#xff08;\u793a\u4f8b&#xff09;<\/span><br \/>\n<span class=\"token function\">sudo<\/span> bpftrace <span class=\"token parameter variable\">-e<\/span> <span class=\"token string\">&#039;tracepoint:kvm:kvm_exit { &#064;[args-&gt;exit_reason] &#061; count(); }&#039;<\/span><br \/>\n<span class=\"token comment\"># \u8dd1\u4e00\u6bb5\u65f6\u95f4 Ctrl-C&#xff0c;\u770b\u54ea\u4e9b reason \u5360\u4e3b\u5bfc<\/span><\/p>\n<p>\u89e3\u8bfb\u65b9\u5411&#xff1a;<\/p>\n<table>\n<tr>\u4e3b\u5bfc Exit\u53ef\u80fd\u542b\u4e49\u52a8\u4f5c<\/tr>\n<tbody>\n<tr>\n<td>IO \/ MMIO \u6781\u9ad8<\/td>\n<td>\u8bbe\u5907\u592a\u5435\u6216\u672a\u7528 virtio<\/td>\n<td>\u6362 virtio\u3001\u67e5\u9a71\u52a8<\/td>\n<\/tr>\n<tr>\n<td>HLT \u6781\u9ad8<\/td>\n<td>Guest idle \u6b63\u5e38\u6216 halt \u8fc7\u9891<\/td>\n<td>\u770b steal\/idle&#xff1b;halt_poll \u8c03\u53c2<\/td>\n<\/tr>\n<tr>\n<td>EPT violation \u6781\u9ad8<\/td>\n<td>\u7f3a\u9875\u3001\u6c14\u7403\u3001\u810f\u9875\u8ffd\u8e2a<\/td>\n<td>\u67e5\u5185\u5b58\u8d85\u5356\u3001migration log<\/td>\n<\/tr>\n<tr>\n<td>EXTERNAL_INTERRUPT \u9ad8<\/td>\n<td>Host \u4e2d\u65ad\u591a<\/td>\n<td>\u67e5\u5bbf\u4e3b\u673a IRQ \/ \u7ed1\u6838<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>6.3 VM-Entry \u5931\u8d25<\/h4>\n<p>\u75c7\u72b6&#xff1a;vCPU \u8d77\u4e0d\u6765\u3001QEMU \u7acb\u5373\u9000\u51fa\u3001dmesg \u6709 entry failure\u3002\u65b9\u5411&#xff1a;<\/p>\n<ul>\n<li>CPU \u6a21\u578b\u66b4\u9732\u4e86 Host \u6ca1\u6709\u7684\u7279\u6027&#xff1b;<\/li>\n<li>\u5d4c\u5957\u63a7\u4ef6\u914d\u7f6e\u975e\u6cd5&#xff1b;<\/li>\n<li>\u5fae\u7801\/\u5185\u6838 bug&#xff08;\u67e5\u53d1\u884c\u7248\u516c\u544a&#xff09;&#xff1b;<\/li>\n<li>\u624b\u5de5\u6539 MSR \u5bfc\u81f4\u63a7\u5236\u5757\u4e0d\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<p>\u7f29\u5c0f\u6cd5&#xff1a;\u6362 -cpu qemu64 \u6216\u4fdd\u5b88\u547d\u540d\u6a21\u578b\u8bd5\u662f\u5426\u6062\u590d&#xff1b;\u5bf9\u6bd4\u4e24\u53f0\u673a\u5668 diff &lt;(cat \/proc\/cpuinfo) &#8230;\u3002<\/p>\n<h4>6.4 \u300c\u50cf\u5361\u4f4f\u300d\u4f46\u5b9e\u4e3a Exit \u98ce\u66b4<\/h4>\n<p>Guest \u8868\u9762 idle \u6216\u4e1a\u52a1\u541e\u5410\u6781\u4f4e&#xff0c;Host \u4e0a qemu \u7ebf\u7a0b CPU 100%\u3002\u5148\u770b Exit&#xff0c;\u518d\u770b\u662f\u5426\u9519\u8bef\u5730\u7528\u4e86 TCG&#xff0c;\u518d\u770b\u78c1\u76d8\u662f\u5426 virtio-blk\/scsi\u3002<\/p>\n<h4>6.5 \u5d4c\u5957\u865a\u62df\u5316 CPU \u4fa7<\/h4>\n<p><span class=\"token comment\"># L0<\/span><br \/>\n<span class=\"token function\">cat<\/span> \/sys\/module\/kvm_intel\/parameters\/nested<br \/>\n<span class=\"token comment\"># QEMU \u7ed9 L1 \u66b4\u9732 vmx&#xff1a;<\/span><br \/>\n<span class=\"token comment\"># -cpu host \u6216 &#043;vmx<\/span><\/p>\n<p><span class=\"token comment\"># L1 \u5185<\/span><br \/>\n<span class=\"token function\">grep<\/span> vmx \/proc\/cpuinfo<br \/>\nmodprobe kvm_intel<\/p>\n<p>L1 \u65e0\u6807\u5fd7 \u2192 \u5148\u4fee L0 \u4f20\u9012&#xff1b;\u6709\u6807\u5fd7\u4ecd\u5931\u8d25 \u2192 \u67e5 L1 \u5185\u6838\u6a21\u5757\u4e0e\u6743\u9650\u3002<\/p>\n<h4>6.6 \u89c2\u6d4b MSR \/ \u7279\u6027\u662f\u5426\u88ab\u62e6<\/h4>\n<p><span class=\"token comment\"># Guest \u5185<\/span><br \/>\ncpuid <span class=\"token operator\">|<\/span> <span class=\"token function\">head<\/span><br \/>\n<span class=\"token function\">dmesg<\/span> <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> <span class=\"token parameter variable\">-i<\/span> hypervisor<br \/>\n<span class=\"token function\">cat<\/span> \/sys\/devices\/system\/clocksource\/clocksource0\/current_clocksource<br \/>\n<span class=\"token comment\"># \u671f\u671b\u5e38\u89c1&#xff1a;kvm-clock<\/span><\/p>\n<p>\u65f6\u949f\u6e90\u843d\u5728 pit\/acpi_pm \u4e14\u8d1f\u8f7d\u9ad8&#xff0c;\u53ef\u80fd\u4e0e\u865a\u62df\u5316\u65f6\u949f\u914d\u7f6e\u6709\u5173&#xff0c;\u95f4\u63a5\u63a8\u9ad8 Exit\u3002<\/p>\n<h4>6.7 \u4e0e\u5b89\u5168\u6a21\u5757\u3001\u8c03\u8bd5\u9009\u9879<\/h4>\n<ul>\n<li>kvm_intel \u7684 ept&#061;0\u3001unrestricted_guest&#061;0 \u7b49\u53c2\u6570&#xff08;\u8001\u673a\u5668\/\u8c03\u8bd5&#xff09;\u4f1a\u6539\u53d8 Exit \u5f62\u6001\u4e0e\u80fd\u5426\u542f\u52a8\u5b9e\u6a21\u5f0f Guest\u3002<\/li>\n<li>\u751f\u4ea7\u6539\u8fd9\u4e9b\u53c2\u6570\u524d\u5148\u8bfb Documentation\/virt\/kvm\/ \u4e0e\u6a21\u5757 parameters \u8bf4\u660e\u3002<\/li>\n<\/ul>\n<p>modinfo kvm_intel <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> <span class=\"token parameter variable\">-A2<\/span> parm<br \/>\nmodinfo kvm_amd <span class=\"token operator\">|<\/span> <span class=\"token function\">grep<\/span> <span class=\"token parameter variable\">-A2<\/span> parm<\/p>\n<h4>6.8 \u5206\u5c42\u6392\u969c\u53e3\u8bc0<\/h4>\n<p>1. \u6709\u6ca1\u6709 vmx\/svm&#xff1f;<br \/>\n2. \u6709\u6ca1\u6709 \/dev\/kvm \u4e14 QEMU \u7528\u4e86 kvm accel&#xff1f;<br \/>\n3. Exit \u662f\u6b63\u5e38\u8bbe\u5907\u884c\u4e3a\u8fd8\u662f\u5f02\u5e38\u98ce\u66b4&#xff1f;<br \/>\n4. \u662f Entry \u5931\u8d25\u8fd8\u662f Exit \u540e\u6a21\u62df\u5931\u8d25&#xff1f;<br \/>\n5. \u662f\u5d4c\u5957\u4f20\u9012\u95ee\u9898\u8fd8\u662f\u5355\u5c42\u95ee\u9898&#xff1f;<br \/>\n6. \u624b\u518c\u7ea7\u5b57\u6bb5\u5b58\u7591\u65f6&#xff0c;\u4ee5 SDM\/APM \u4e3a\u51c6&#xff0c;\u4e0d\u9760\u8bb0\u5fc6\u4e2d\u7684\u9b54\u6570\u3002<\/p>\n<hr \/>\n<h3>\u91cd\u70b9\u77e5\u8bc6\u4e32\u7ebf<\/h3>\n<p>Guest \u60f3\u8981 Ring0<br \/>\n  \u2192 \u786c\u4ef6\u63d0\u4f9b non-root \/ VMRUN \u4e16\u754c<br \/>\n  \u2192 \u7528 VMCS\/VMCB \u63cf\u8ff0\u72b6\u6001\u4e0e\u62e6\u622a<br \/>\n  \u2192 Entry \u8fdb\u5165&#xff0c;\u654f\u611f\u4e8b\u4ef6 Exit<br \/>\n  \u2192 kvm_x86_ops \u628a\u5382\u5546\u5dee\u5f02\u6536\u53e3<br \/>\n  \u2192 \u80fd\u5185\u6838\u89e3\u51b3\u7684\u4e0d\u56de\u7528\u6237\u6001<br \/>\n  \u2192 \u5426\u5219\u53d8\u6210\u7a33\u5b9a\u7684 KVM_EXIT_*<br \/>\n  \u2192 QEMU \u6a21\u62df\u8bbe\u5907\u540e\u518d RUN<\/p>\n<p>\u5bf9\u6bd4&#xff1a;<\/p>\n<p>\u65e0\u786c\u4ef6\u65f6&#xff1a;TCG \u7ffb\u8bd1\u6574\u6761\u6307\u4ee4\u6d41<br \/>\n\u6709\u786c\u4ef6\u65f6&#xff1a;\u539f\u751f\u8dd1 &#043; \u5c11\u91cf Exit<\/p>\n<p>\u6027\u80fd\u4e0e\u6b63\u786e\u6027\u90fd\u6302\u5728 \u62e6\u622a\u96c6\u5408\u662f\u5426\u5408\u9002 \u4e0e Exit \u5904\u7406\u662f\u5426\u8d70\u6700\u5feb\u8def\u5f84 \u4e0a\u3002<\/p>\n<h4>\u4e0e\u540c\u7cfb\u5217 KVM ioctl \u6587\u7684\u5206\u5de5<\/h4>\n<ul>\n<li>\u300a\u4ece \/dev\/kvm ioctl \u5230 qemu-system\u300b\u8bb2 \u7528\u6237\u6001 API\u3001fd\u3001QEMU \u534f\u4f5c\u3001\u52a0\u901f\u5668\u672a\u5f00&#xff1b;<\/li>\n<li>\u672c\u6587\u8bb2 CPU \u6a21\u5f0f\u3001Entry\/Exit\u3001\u539f\u56e0\u7801\u3001ops \u8868\u3001\u7ffb\u8bd1\u5bf9\u6bd4\u3002<\/li>\n<\/ul>\n<p>\u4e8c\u8005\u5408\u8bfb\u53ef\u8986\u76d6\u300c\u865a\u62df\u673a CPU \u4e3a\u4ec0\u4e48\u8fd9\u6837\u8dd1\u300d\u7684\u95ed\u73af\u3002<\/p>\n<h4>\u6e90\u7ae0\u8282\u5bf9\u5e94<\/h4>\n<p>\u5408\u5e76\u91cd\u5199\u81ea \u865a\u62df\u5316\u6280\u672f\/chapters\/009&#xff5e;014&#xff08;CPU \u865a\u62df\u5316\u6982\u5ff5\u3001\u673a\u5236\u3001\u5173\u952e\u70b9\u3001\u6e90\u7801\u3001\u914d\u7f6e\u3001\u95ee\u9898&#xff09;&#xff0c;\u66ff\u6362\u6a21\u677f\u53d9\u8ff0\u4e3a\u53ef\u5bf9\u7167\u5185\u6838\u4e0e\u624b\u518c\u7684\u8def\u5f84\u3002<\/p>\n<h4>\u5ef6\u4f38\u9605\u8bfb<\/h4>\n<ul>\n<li>Linux Documentation\/virt\/kvm\/<\/li>\n<li>Intel SDM Volume 3&#xff1a;VMX<\/li>\n<li>AMD Architecture Programmer\u2019s Manual&#xff1a;SVM<\/li>\n<li>arch\/x86\/kvm\/vmx\/vmx.c\u3001svm\/svm.c \u4e2d handle_exit \u5206\u53d1<\/li>\n<\/ul>\n<hr \/>\n<h3>\u9644\u5f55 A&#xff1a;Intel Exit reason \u5de5\u7a0b\u5e38\u7528\u5b50\u96c6<\/h3>\n<p>&#xff08;\u6570\u503c\u53ef\u80fd\u968f SDM \u4fee\u8ba2&#xff0c;\u6838\u5bf9\u672c\u673a asm\/vmx.h \u6216\u624b\u518c\u3002&#xff09;<\/p>\n<table>\n<tr>\u6982\u5ff5\u540d\u5178\u578b\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>EXCEPTION_NMI<\/td>\n<td>\u5f02\u5e38\/NMI \u6309 bitmap \u9000\u51fa<\/td>\n<\/tr>\n<tr>\n<td>EXTERNAL_INTERRUPT<\/td>\n<td>Host \u4e2d\u65ad<\/td>\n<\/tr>\n<tr>\n<td>TRIPLE_FAULT<\/td>\n<td>Guest \u5d29\u6e83\u8def\u5f84<\/td>\n<\/tr>\n<tr>\n<td>CPUID<\/td>\n<td>\u7279\u6027\u4f2a\u88c5\/\u9690\u85cf<\/td>\n<\/tr>\n<tr>\n<td>HLT<\/td>\n<td>\u505c\u673a\u7b49\u5f85<\/td>\n<\/tr>\n<tr>\n<td>VMCALL<\/td>\n<td>hypercall<\/td>\n<\/tr>\n<tr>\n<td>CR_ACCESS<\/td>\n<td>\u63a7\u5236\u5bc4\u5b58\u5668\u8bbf\u95ee<\/td>\n<\/tr>\n<tr>\n<td>IO_INSTRUCTION<\/td>\n<td>PIO<\/td>\n<\/tr>\n<tr>\n<td>MSR_READ\/WRITE<\/td>\n<td>MSR \u62e6\u622a<\/td>\n<\/tr>\n<tr>\n<td>EPT_VIOLATION<\/td>\n<td>\u4e8c\u7ea7\u9875\u8868\u7f3a\u5931\u6216\u6743\u9650<\/td>\n<\/tr>\n<tr>\n<td>EPT_MISCONFIG<\/td>\n<td>EPT \u9879\u975e\u6cd5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u9644\u5f55 B&#xff1a;AMD Exit code \u5de5\u7a0b\u5e38\u7528\u5b50\u96c6<\/h3>\n<p>&#xff08;\u4ee5 asm\/svm.h \/ APM \u4e3a\u51c6\u3002&#xff09;<\/p>\n<table>\n<tr>\u6982\u5ff5\u540d\u5178\u578b\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>EXCP_*<\/td>\n<td>\u5f02\u5e38\u7c7b<\/td>\n<\/tr>\n<tr>\n<td>INTR<\/td>\n<td>\u7269\u7406\u4e2d\u65ad<\/td>\n<\/tr>\n<tr>\n<td>HLT<\/td>\n<td>\u505c\u673a<\/td>\n<\/tr>\n<tr>\n<td>NPF<\/td>\n<td>Nested Page Fault&#xff08;\u7c7b\u4f3c EPT violation&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>MSR<\/td>\n<td>MSR \u8bbf\u95ee<\/td>\n<\/tr>\n<tr>\n<td>IOIO<\/td>\n<td>IO \u6307\u4ee4<\/td>\n<\/tr>\n<tr>\n<td>VMMCALL<\/td>\n<td>hypercall<\/td>\n<\/tr>\n<tr>\n<td>SHUTDOWN<\/td>\n<td>\u5173\u673a\u7c7b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u9644\u5f55 C&#xff1a;\u7528\u6237\u6001 KVM_EXIT \u4e0e\u786c\u4ef6\u539f\u56e0\u7684\u5173\u7cfb<\/h3>\n<p>\u786c\u4ef6 EXIT_REASON_IO_INSTRUCTION<br \/>\n    \u2192 KVM \u89e3\u7801 qualification<br \/>\n    \u2192 \u82e5\u9700\u7528\u6237\u6001&#xff1a;KVM_EXIT_IO<br \/>\n    \u2192 \u82e5\u8d70\u5185\u6838 irqchip\/\u7279\u6b8a\u4f18\u5316&#xff1a;\u53ef\u80fd\u4e0d\u56de\u7528\u6237\u6001<\/p>\n<p>\u786c\u4ef6 EPT_VIOLATION on RAM<br \/>\n    \u2192 MMU \u8865\u6620\u5c04<br \/>\n    \u2192 \u5e38\u76f4\u63a5\u518d Entry&#xff08;\u7528\u6237\u6001\u65e0\u611f&#xff09;<\/p>\n<p>\u786c\u4ef6 EPT_VIOLATION on MMIO hole<br \/>\n    \u2192 KVM_EXIT_MMIO<\/p>\n<p>\u4e0d\u8981\u7528\u300c\u53ea\u7edf\u8ba1 KVM_EXIT\u300d\u8bc4\u4f30\u5168\u90e8 CPU Exit \u6210\u672c\u3002<\/p>\n<h3>\u9644\u5f55 D&#xff1a;\u6700\u5c0f\u5b9e\u9a8c\u811a\u672c\u601d\u8def<\/h3>\n<p><span class=\"token comment\"># \u7ec8\u7aef 1&#xff1a;\u8dd1\u865a\u62df\u673a<\/span><br \/>\nqemu-system-x86_64 <span class=\"token parameter variable\">-accel<\/span> kvm <span class=\"token parameter variable\">-cpu<\/span> <span class=\"token function\">host<\/span> <span class=\"token parameter variable\">-m<\/span> <span class=\"token number\">1024<\/span> <span class=\"token parameter variable\">-smp<\/span> <span class=\"token number\">2<\/span> <span class=\"token punctuation\">..<\/span>.<\/p>\n<p><span class=\"token comment\"># \u7ec8\u7aef 2&#xff1a;\u7edf\u8ba1 10 \u79d2 Exit<\/span><br \/>\n<span class=\"token function\">sudo<\/span> <span class=\"token function\">timeout<\/span> <span class=\"token number\">10<\/span> bpftrace <span class=\"token parameter variable\">-e<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token string\">&#039;tracepoint:kvm:kvm_exit { &#064;[args-&gt;exit_reason] &#061; count(); }&#039;<\/span><\/p>\n<p><span class=\"token comment\"># \u7ec8\u7aef 3&#xff1a;\u5bf9\u6bd4\u5173\u6389\u52a0\u901f<\/span><br \/>\n<span class=\"token comment\"># \u5c06 -accel kvm \u6539\u4e3a -accel tcg&#xff0c;\u4f53\u611f\u4e0e CPU \u5360\u7528\u5bf9\u6bd4<\/span><\/p>\n<p>\u8bb0\u5f55\u4e24\u4efd\u76f4\u65b9\u56fe&#xff0c;\u5bf9\u7406\u89e3\u300c\u786c\u4ef6\u8f85\u52a9\u7701\u5728\u54ea\u91cc\u300d\u6bd4\u8bfb\u5341\u9875\u6982\u5ff5\u66f4\u6709\u6548\u3002<\/p>\n<h3>\u9644\u5f55 E&#xff1a;kvm_x86_ops \u9605\u8bfb\u987a\u5e8f\u5efa\u8bae<\/h3>\n<li>\u5728 x86.c \u627e vcpu_enter_guest \/ kvm_arch_vcpu_ioctl_run \u5982\u4f55\u8c03 kvm_x86_ops.vcpu_run&#xff1b;<\/li>\n<li>\u6253\u5f00 vmx_vcpu_run \u6216 svm_vcpu_run&#xff0c;\u53ea\u8ddf\u300c\u8fdb\/\u51fa\u300d\u4e24\u6761\u6c47\u7f16\/\u5185\u8054\u8def\u5f84&#xff1b;<\/li>\n<li>\u518d\u8fdb handle_exit&#xff0c;\u6311 CPUID\u3001IO\u3001EPT\/NPF \u4e09\u4e2a case \u7cbe\u8bfb&#xff1b;<\/li>\n<li>\u6700\u540e\u624d\u8bfb\u5d4c\u5957\u4e0e APICv\/AVIC \u4f18\u5316\u3002<\/li>\n<p>\u6309\u6b64\u987a\u5e8f\u4e0d\u4f1a\u5728\u7b2c\u4e00\u6b21\u9605\u8bfb\u65f6\u88ab\u6570\u5343\u884c\u4f18\u5316\u652f\u8def\u6df9\u6ca1\u3002<\/p>\n<h3>\u9644\u5f55 F&#xff1a;\u7279\u6743\u7ea7\u4e0e\u300cGuest Ring0\u300d\u518d\u6f84\u6e05<\/h3>\n<p>Guest \u5185\u6267\u884c current privilege level &#061;&#061; 0 \u7684\u4ee3\u7801\u6bb5\u65f6&#xff0c;\u5728 Guest \u81ea\u5df1\u7684\u89c6\u89d2\u5c31\u662f\u5185\u6838\u3002Host \u89c6\u89d2\u5219\u662f non-root \u6a21\u5f0f\u3002\u4e24\u5957\u300c\u8c01\u66f4\u7279\u6743\u300d\u53e0\u5728\u4e00\u8d77&#xff1a;<\/p>\n<table>\n<tr>\u89c6\u89d2Guest \u7528\u6237\u6001Guest \u5185\u6838Host \u5185\u6838<\/tr>\n<tbody>\n<tr>\n<td>Guest \u53ef\u89c1 CPL<\/td>\n<td>3<\/td>\n<td>0<\/td>\n<td>\u4e0d\u53ef\u89c1<\/td>\n<\/tr>\n<tr>\n<td>Host \u6a21\u5f0f<\/td>\n<td>non-root<\/td>\n<td>non-root<\/td>\n<td>root &#043; \u771f Ring0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Exit \u540e\u4e00\u5b9a\u5148\u56de\u5230 Host \u5185\u6838&#xff0c;\u800c\u4e0d\u662f\u56de\u5230 Guest \u7528\u6237\u6001\u2014\u2014\u8fd9\u662f\u9694\u79bb\u7684\u6839\u57fa\u3002<\/p>\n<h3>\u9644\u5f55 G&#xff1a;\u4e0e\u4e8c\u8fdb\u5236\u7ffb\u8bd1\u7684\u6b63\u786e\u6027\u8fb9\u754c<\/h3>\n<p>TCG \u5fc5\u987b\u5728\u7ffb\u8bd1\u671f\u8bc6\u522b\u654f\u611f\u6307\u4ee4&#xff1b;\u82e5\u6f0f\u8bd1&#xff0c;\u4f1a\u51fa\u73b0\u300cGuest \u5185\u6838\u4ee5\u4e3a\u6539\u5199\u4e86 CR3&#xff0c;\u5b9e\u9645 Host \u672a\u62e6\u622a\u300d\u7c7b\u81f4\u547d\u9519\u8bef\u3002\u786c\u4ef6\u8f85\u52a9\u628a\u8bc6\u522b\u4ea4\u7ed9 CPU \u914d\u7f6e&#xff0c;\u6b63\u786e\u6027\u5ba1\u6838\u9762\u4ece\u300c\u7ffb\u8bd1\u5668\u8986\u76d6\u7387\u300d\u8f6c\u4e3a\u300c\u63a7\u5236\u5b57\u6bb5\u7b56\u7565\u300d\u3002\u4e24\u8005 bug \u5f62\u6001\u4e0d\u540c&#xff1a;<\/p>\n<ul>\n<li>TCG bug&#xff1a;\u9519\u8bef\u4ee3\u7801\u751f\u6210\u3001TB \u5931\u6548\u6761\u4ef6\u4e0d\u5bf9&#xff1b;<\/li>\n<li>KVM bug&#xff1a;bitmap \u6f0f\u62e6\u3001Exit \u5904\u7406\u9519\u3001Entry \u68c0\u67e5\u4e0d\u5b8c\u6574\u3002<\/li>\n<\/ul>\n<p>\u5b9a\u4f4d\u65f6\u5148\u786e\u8ba4\u52a0\u901f\u5668&#xff0c;\u518d\u9009\u5bf9\u5e94\u5de5\u5177\u94fe\u3002<\/p>\n<h3>\u9644\u5f55 H&#xff1a;\u751f\u4ea7\u73af\u5883\u5feb\u901f\u5bf9\u7167\u8868<\/h3>\n<table>\n<tr>\u75c7\u72b6\u5148\u67e5<\/tr>\n<tbody>\n<tr>\n<td>\u65e0\u6cd5\u542f\u52a8 \/ KVM unavailable<\/td>\n<td>CPU \u6807\u5fd7\u3001\u6a21\u5757\u3001\/dev\/kvm\u3001accel<\/td>\n<\/tr>\n<tr>\n<td>\u6781\u6162\u4f46\u80fd\u8dd1<\/td>\n<td>\u662f\u5426\u5176\u5b9e TCG&#xff1b;Exit \u76f4\u65b9\u56fe&#xff1b;virtio<\/td>\n<\/tr>\n<tr>\n<td>\u968f\u673a\u975e\u6cd5\u6307\u4ee4<\/td>\n<td>CPU \u6a21\u578b\/\u8fc1\u79fb\u7279\u6027\u96c6<\/td>\n<\/tr>\n<tr>\n<td>\u5d4c\u5957\u5931\u8d25<\/td>\n<td>nested \u53c2\u6570\u3001&#043;vmx\/&#043;svm \u4f20\u9012<\/td>\n<\/tr>\n<tr>\n<td>\u6536\u4e0d\u5230\u4e2d\u65ad<\/td>\n<td>irqchip \u6a21\u5f0f\u3001\u7a97\u53e3\u6ce8\u5165\u3001\u8bbe\u5907\u8def\u7531<\/td>\n<\/tr>\n<tr>\n<td>\u5f00\u673a\u4e09\u500d\u6545\u969c<\/td>\n<td>Guest \u5185\u6838\/\u56fa\u4ef6&#xff1b;Entry \u914d\u7f6e&#xff1b;\u6700\u8fd1 CPU \u53d8\u66f4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u9644\u5f55 I&#xff1a;\u6e90\u7801\u6587\u4ef6\u4e0e\u804c\u8d23\u901f\u67e5<\/h3>\n<p>arch\/x86\/kvm\/x86.c          \u2014 \u516c\u5171 run\u3001CPUID\u3001MSR \u6846\u67b6<br \/>\narch\/x86\/kvm\/vmx\/vmx.c      \u2014 VMCS\u3001VMX Entry\/Exit<br \/>\narch\/x86\/kvm\/vmx\/nested.c   \u2014 \u5d4c\u5957 VMX&#xff08;\u82e5\u542f\u7528&#xff09;<br \/>\narch\/x86\/kvm\/svm\/svm.c      \u2014 VMCB\u3001SVM Entry\/Exit<br \/>\narch\/x86\/kvm\/svm\/nested.c   \u2014 \u5d4c\u5957 SVM<br \/>\narch\/x86\/kvm\/mmu\/           \u2014 EPT\/NPT \u4e0e violation \u5904\u7406<br \/>\narch\/x86\/kvm\/emulate.c      \u2014 \u6307\u4ee4\u4eff\u771f\u8f85\u52a9<br \/>\nvirt\/kvm\/kvm_main.c         \u2014 ioctl \/ KVM_RUN \u603b\u5165\u53e3<br \/>\ninclude\/uapi\/linux\/kvm.h    \u2014 \u7528\u6237 ABI<\/p>\n<h3>\u9644\u5f55 J&#xff1a;\u624b\u518c\u9605\u8bfb\u6cd5&#xff08;\u907f\u514d\u80cc\u9519\u5b57\u6bb5&#xff09;<\/h3>\n<li>\u5148\u5728\u5185\u6838\u5934\u6587\u4ef6\u786e\u8ba4 \u672c\u673a\u4f7f\u7528\u7684 reason \u5b8f\u540d&#xff1b;<\/li>\n<li>\u518d\u7528\u624b\u518c\u67e5\u8be5\u5b8f\u5bf9\u5e94\u7684 \u8d44\u683c\u5b57\u6bb5\u6bd4\u7279\u5b9a\u4e49&#xff1b;<\/li>\n<li>\u6700\u540e\u56de handle_* \u770b KVM \u7528\u4e86\u54ea\u4e9b\u6bd4\u7279\u3002<\/li>\n<p>\u4e0d\u8981\u4ece\u4e8c\u624b\u6587\u7ae0\u6284\u300cExit reason &#061; 30 \u4e00\u5b9a\u662f\u67d0\u67d0\u300d\u2014\u2014\u7f16\u7801\u8868\u4f1a\u53d8&#xff0c;\u4e14 Intel\/AMD \u7f16\u53f7\u7a7a\u95f4\u4e0d\u540c\u3002<\/p>\n<hr \/>\n<p>\u5408\u5e76\u6e90&#xff1a;articles\/\u865a\u62df\u5316\u6280\u672f\/chapters\/009&#xff5e;014&#xff1b;\u4f53\u88c1&#xff1a;CSDN \u5408\u5e76\u957f\u6587&#xff1b;\u4e3b\u7ebf&#xff1a;\u7279\u6743\u7ea7 \u2192 VT-x\/AMD-V \u2192 Entry\/Exit \u2192 kvm_x86_ops \u2192 \u7ffb\u8bd1\u5bf9\u6bd4 \u2192 \u6392\u969c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u865a\u62df\u673a\u542f\u52a8\u540e\u6253\u5b57\u90fd\u5361\u3001perf \u91cc kvm_exit \u5237\u5c4f&#xff1b;\u5d4c\u5957\u573a\u666f L2 \u8fdb\u4e0d\u4e86&#xff1b;\u540c\u955c\u50cf\u5728\u88f8\u673a KVM \u98de\u5feb\u3001\u5728\u67d0\u53f0\u673a\u5668\u4e0a\u5374\u50cf\u7eaf\u4eff\u771f\u2014\u2014\u6839\u56e0\u7ecf\u5e38\u4e0d\u5728\u78c1\u76d8\u955c\u50cf&#xff0c;\u800c\u5728 CPU \u865a\u62df\u5316\u6a21\u5f0f\u9009\u9519\u3001\u7279\u6743\u6307\u4ee4\u62e6\u622a\u8fc7\u5bbd\/\u8fc7\u7a84\u3001VM-Entry \u5931\u8d25\u3001\u6216 Exit \u539f\u56e0\u6ca1\u5bf9\u4e0a\u8bbe\u5907\u6a21\u578b\u3002\u672c\u6587\u6cbf\u4e00\u6761\u4e3b\u7ebf\u8bb2\u900f&#xff1a;\u7279\u6743\u7ea7\u4e0e\u654f\u611f\u6307\u4ee4\u95ee\u9898 \u2192 Intel VT-x \/ AMD-V \u5982\u4f55\u6539\u5199\u6267\u884c\u6a21\u5f0f \u2192 VM-Entry\/VM-Exit \u4e0e\u539f\u56e0\u7801 \u2192<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[78],"topic":[],"class_list":["post-105246","post","type-post","status-publish","format-standard","hentry","category-server","tag-78"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Guest \u4e00\u8dd1\u5c31\u5361\u6b7b\uff1fVT-x\/AMD-V \u4ece\u7279\u6743\u7ea7\u5230VM-Exit \u539f\u56e0\u7801\u4e00\u6761\u7ebf\u8bb2\u900f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/105246.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Guest \u4e00\u8dd1\u5c31\u5361\u6b7b\uff1fVT-x\/AMD-V \u4ece\u7279\u6743\u7ea7\u5230VM-Exit \u539f\u56e0\u7801\u4e00\u6761\u7ebf\u8bb2\u900f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u865a\u62df\u673a\u542f\u52a8\u540e\u6253\u5b57\u90fd\u5361\u3001perf \u91cc kvm_exit \u5237\u5c4f&#xff1b;\u5d4c\u5957\u573a\u666f L2 \u8fdb\u4e0d\u4e86&#xff1b;\u540c\u955c\u50cf\u5728\u88f8\u673a KVM \u98de\u5feb\u3001\u5728\u67d0\u53f0\u673a\u5668\u4e0a\u5374\u50cf\u7eaf\u4eff\u771f\u2014\u2014\u6839\u56e0\u7ecf\u5e38\u4e0d\u5728\u78c1\u76d8\u955c\u50cf&#xff0c;\u800c\u5728 CPU \u865a\u62df\u5316\u6a21\u5f0f\u9009\u9519\u3001\u7279\u6743\u6307\u4ee4\u62e6\u622a\u8fc7\u5bbd\/\u8fc7\u7a84\u3001VM-Entry \u5931\u8d25\u3001\u6216 Exit 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