diff options
| author | Sean Christopherson <seanjc@google.com> | 2021-09-20 17:03:00 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-09-30 04:27:07 -0400 |
| commit | d06567353e129b460978353cbe2210c23467d6f8 (patch) | |
| tree | f9c59f19ce736a761aef0fa2486c78d8519324d0 /arch/x86/kvm/vmx | |
| parent | 583d369b36a90753d8b169f041b39078ac4e1633 (diff) | |
KVM: VMX: Drop explicit zeroing of MSR guest values at vCPU creation
Don't zero out user return and nested MSRs during vCPU creation, and
instead rely on vcpu_vmx being zero-allocated. Explicitly zeroing MSRs
is not wrong, and is in fact necessary if KVM ever emulates vCPU RESET
outside of vCPU creation, but zeroing only a subset of MSRs is confusing.
Poking directly into KVM's backing is also undesirable in that it doesn't
scale and is error prone. Ideally KVM would have a common RESET path for
all MSRs, e.g. by expanding kvm_set_msr(), which would obviate the need
for this out-of-bad code (to support standalone RESET).
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210921000303.400537-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx')
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 7c496fd0bb96..65be36166989 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -6837,10 +6837,8 @@ static int vmx_create_vcpu(struct kvm_vcpu *vcpu) goto free_vpid; } - for (i = 0; i < kvm_nr_uret_msrs; ++i) { - vmx->guest_uret_msrs[i].data = 0; + for (i = 0; i < kvm_nr_uret_msrs; ++i) vmx->guest_uret_msrs[i].mask = -1ull; - } if (boot_cpu_has(X86_FEATURE_RTM)) { /* * TSX_CTRL_CPUID_CLEAR is handled in the CPUID interception. @@ -6897,8 +6895,6 @@ static int vmx_create_vcpu(struct kvm_vcpu *vcpu) if (nested) memcpy(&vmx->nested.msrs, &vmcs_config.nested, sizeof(vmx->nested.msrs)); - else - memset(&vmx->nested.msrs, 0, sizeof(vmx->nested.msrs)); vcpu_setup_sgx_lepubkeyhash(vcpu); |