RDTSCP was never supported for AMD CPUs, which nobody noticed because
Linux does not use it. But exactly the fact that Linux does not
use it makes the implementation very simple; we can freely trash
MSR_TSC_AUX while running the guest.
Cc: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
MSR_FS_BASE,
#endif
MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
MSR_FS_BASE,
#endif
MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
};
#define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)
};
#define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)
uint64_t asid_generation;
uint64_t sysenter_esp;
uint64_t sysenter_eip;
uint64_t asid_generation;
uint64_t sysenter_esp;
uint64_t sysenter_eip;
wrmsrl(MSR_AMD64_TSC_RATIO, tsc_ratio);
}
}
wrmsrl(MSR_AMD64_TSC_RATIO, tsc_ratio);
}
}
+ /* This assumes that the kernel never uses MSR_TSC_AUX */
+ if (static_cpu_has(X86_FEATURE_RDTSCP))
+ wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
}
static void svm_vcpu_put(struct kvm_vcpu *vcpu)
}
static void svm_vcpu_put(struct kvm_vcpu *vcpu)
case MSR_IA32_SYSENTER_ESP:
msr_info->data = svm->sysenter_esp;
break;
case MSR_IA32_SYSENTER_ESP:
msr_info->data = svm->sysenter_esp;
break;
+ case MSR_TSC_AUX:
+ if (!boot_cpu_has(X86_FEATURE_RDTSCP))
+ return 1;
+ msr_info->data = svm->tsc_aux;
+ break;
/*
* Nobody will change the following 5 values in the VMCB so we can
* safely return them on rdmsr. They will always be 0 until LBRV is
/*
* Nobody will change the following 5 values in the VMCB so we can
* safely return them on rdmsr. They will always be 0 until LBRV is
svm->sysenter_esp = data;
svm->vmcb->save.sysenter_esp = data;
break;
svm->sysenter_esp = data;
svm->vmcb->save.sysenter_esp = data;
break;
+ case MSR_TSC_AUX:
+ if (!boot_cpu_has(X86_FEATURE_RDTSCP))
+ return 1;
+
+ /*
+ * This is rare, so we update the MSR here instead of using
+ * direct_access_msrs. Doing that would require a rdmsr in
+ * svm_vcpu_put.
+ */
+ svm->tsc_aux = data;
+ wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
+ break;
case MSR_IA32_DEBUGCTLMSR:
if (!boot_cpu_has(X86_FEATURE_LBRV)) {
vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
case MSR_IA32_DEBUGCTLMSR:
if (!boot_cpu_has(X86_FEATURE_LBRV)) {
vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
static bool svm_rdtscp_supported(void)
{
static bool svm_rdtscp_supported(void)
{
+ return boot_cpu_has(X86_FEATURE_RDTSCP);
}
static bool svm_invpcid_supported(void)
}
static bool svm_invpcid_supported(void)