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| author | Arbel Moshe <arbel.moshe@oracle.com> | 2018-03-12 13:12:53 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-03-16 22:02:01 +0100 |
| commit | 2d7921c499afebac78b13ab9a3758261a97e07b7 (patch) | |
| tree | 9fbeb2ebc8c352acdbaab0c13857de719467a76b /arch/x86/kvm/pmu.h | |
| parent | 9718420e9fd462ac6b7ea840f9e63eb6af7e1bda (diff) | |
| download | linux-stable-2d7921c499afebac78b13ab9a3758261a97e07b7.tar.gz linux-stable-2d7921c499afebac78b13ab9a3758261a97e07b7.tar.bz2 linux-stable-2d7921c499afebac78b13ab9a3758261a97e07b7.zip | |
KVM: x86: Add support for VMware backdoor Pseudo-PMCs
VMware exposes the following Pseudo PMCs:
0x10000: Physical host TSC
0x10001: Elapsed real time in ns
0x10002: Elapsed apparent time in ns
For more info refer to:
https://www.vmware.com/files/pdf/techpaper/Timekeeping-In-VirtualMachines.pdf
VMware allows access to these Pseduo-PMCs even when read via RDPMC
in Ring3 and CR4.PCE=0. Therefore, commit modifies x86 emulator
to allow access to these PMCs in this situation. In addition,
emulation of these PMCs were added to kvm_pmu_rdpmc().
Signed-off-by: Arbel Moshe <arbel.moshe@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/pmu.h')
| -rw-r--r-- | arch/x86/kvm/pmu.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h index a9a62b9a73e2..ba8898e1a854 100644 --- a/arch/x86/kvm/pmu.h +++ b/arch/x86/kvm/pmu.h @@ -9,6 +9,10 @@ /* retrieve the 4 bits for EN and PMI out of IA32_FIXED_CTR_CTRL */ #define fixed_ctrl_field(ctrl_reg, idx) (((ctrl_reg) >> ((idx)*4)) & 0xf) +#define VMWARE_BACKDOOR_PMC_HOST_TSC 0x10000 +#define VMWARE_BACKDOOR_PMC_REAL_TIME 0x10001 +#define VMWARE_BACKDOOR_PMC_APPARENT_TIME 0x10002 + struct kvm_event_hw_type_mapping { u8 eventsel; u8 unit_mask; @@ -114,6 +118,8 @@ void kvm_pmu_reset(struct kvm_vcpu *vcpu); void kvm_pmu_init(struct kvm_vcpu *vcpu); void kvm_pmu_destroy(struct kvm_vcpu *vcpu); +bool is_vmware_backdoor_pmc(u32 pmc_idx); + extern struct kvm_pmu_ops intel_pmu_ops; extern struct kvm_pmu_ops amd_pmu_ops; #endif /* __KVM_X86_PMU_H */ |