我遇到了在qemu-kvm上捕获性能监视中断（PMI - 尤其是指令计数器）的情况 . 下面的代码在真机（Intel Core TM i5-4300U）上工作正常但在qemu-kvm（qemu-system-x86_64 -cpu主机）上，我甚至看不到一个PMI . 虽然柜台正常工作 . 我可以检查它增量很好 .
但是，我已经使用Linux内核进行了测试，它在同一个qemu-kvm上很好地捕获了溢出中断 . 因此，在Qemu-kvm上配置性能监视计数器时，显然我缺少一个步骤 .
有人能指出我吗？这是伪代码：
#define LAPIC_SVR 0xF0
#define LAPIC_LVT_PERFM 0x340,
#define CPU_LOCAL_APIC 0xFFFFFFFFBFFFE000
#define NMI_DELIVERY_MODE 0x4 << 8 //NMI
#define MSR_PERF_GLOBAL_CTRL 0x38F
#define MSR_PERF_FIXED_CTRL 0x38D
#define MSR_PERF_FIXED_CTR0 0x309
#define MSR_PERF_GLOBAL_OVF_CTRL 0x390
/*Configure LAPIC*/
apic_base = Msr::read<Paddr>(Msr::IA32_APIC_BASE)
map(CPU_LOCAL_APIC, apic_base & 0xFFFFF000) // No caching, etc.
Msr::write (Msr::IA32_APIC_BASE, apic_base | 0x800);
write (LAPIC_SVR, read (LAPIC_SVR) | 0x100);
*reinterpret_cast<uint32 volatile *>(CPU_LOCAL_APIC + LAPIC_LVT_PERFM) = NMI_DELIVERY_MODE;
/*Configure MSR_PERF_FIXED_CTR0 to have overflow interrupt*/
Msr::write(Msr::MSR_PERF_GLOBAL_CTRL, Msr::read<uint64>(Msr::MSR_PERF_GLOBAL_CTRL) | (1ull<<32)); // enable IA32_PERF_FIXED_CTR0
Msr::write(Msr::MSR_PERF_FIXED_CTRL, 0xa); // configure IA32_PERF_FIXED_CTR0 to count in user mode and interrupt on overflow
Msr::write(Msr::MSR_PERF_FIXED_CTR0, (1<<48) - 0x1000); // overflow after 0x1000 instruction
Msr::write(Msr::MSR_PERF_GLOBAL_OVF_CTRL, Msr::read<uint64>(Msr::MSR_PERF_GLOBAL_OVF_CTRL) & ~(1UL<<32)); // clear overflow condition