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| author | Ilias Stamatis <ilstam@amazon.com> | 2021-05-26 19:44:13 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-06-17 13:09:28 -0400 |
| commit | 307a94c721fed1aaaeee68115df6f7fb8193b23f (patch) | |
| tree | 5bc5f924803a7466af8b3682cbe8b5f5b5b9445e /arch/x86/kvm/vmx/vmx.c | |
| parent | 3c0f99366e34c1b45e4908e151089a8bf93fbe71 (diff) | |
| download | lwn-307a94c721fed1aaaeee68115df6f7fb8193b23f.tar.gz lwn-307a94c721fed1aaaeee68115df6f7fb8193b23f.zip | |
KVM: X86: Add functions for retrieving L2 TSC fields from common code
In order to implement as much of the nested TSC scaling logic as
possible in common code, we need these vendor callbacks for retrieving
the TSC offset and the TSC multiplier that L1 has set for L2.
Signed-off-by: Ilias Stamatis <ilstam@amazon.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20210526184418.28881-7-ilstam@amazon.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index d3201efa6a07..2ce2c73645bf 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -1787,6 +1787,27 @@ static void setup_msrs(struct vcpu_vmx *vmx) vmx->guest_uret_msrs_loaded = false; } +u64 vmx_get_l2_tsc_offset(struct kvm_vcpu *vcpu) +{ + struct vmcs12 *vmcs12 = get_vmcs12(vcpu); + + if (nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETTING)) + return vmcs12->tsc_offset; + + return 0; +} + +u64 vmx_get_l2_tsc_multiplier(struct kvm_vcpu *vcpu) +{ + struct vmcs12 *vmcs12 = get_vmcs12(vcpu); + + if (nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETTING) && + nested_cpu_has2(vmcs12, SECONDARY_EXEC_TSC_SCALING)) + return vmcs12->tsc_multiplier; + + return kvm_default_tsc_scaling_ratio; +} + static u64 vmx_write_l1_tsc_offset(struct kvm_vcpu *vcpu, u64 offset) { struct vmcs12 *vmcs12 = get_vmcs12(vcpu); @@ -7700,6 +7721,8 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = { .has_wbinvd_exit = cpu_has_vmx_wbinvd_exit, + .get_l2_tsc_offset = vmx_get_l2_tsc_offset, + .get_l2_tsc_multiplier = vmx_get_l2_tsc_multiplier, .write_l1_tsc_offset = vmx_write_l1_tsc_offset, .load_mmu_pgd = vmx_load_mmu_pgd, |