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KVM: VMX: Don't _explicitly_ reconfigure user return MSRs on vCPU INIT

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When emulating vCPU INIT, do not unconditionally refresh the list of user
return MSRs that need to be loaded into hardware when running the guest.
Unconditionally refreshing the list is confusing, as the vast majority of
MSRs are not modified on INIT.  The real motivation is to handle the case
where an INIT during long mode obviates the need to load the SYSCALL MSRs,
and that is handled as needed by vmx_set_efer().

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210713163324.627647-36-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-07-13 09:33:13 -07:00 • committed by Paolo Bonzini
parent 432979b503
commit c5c9f920f7
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/vmx/vmx.c
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@ -4410,6 +4410,8 @@ static void init_vmcs(struct vcpu_vmx *vmx)
vmx->pt_desc.guest.output_mask = 0x7F;
vmcs_write64(GUEST_IA32_RTIT_CTL, 0);
}
vmx_setup_uret_msrs(vmx);
}
static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
@ -4468,8 +4470,6 @@ static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
if (kvm_mpx_supported())
vmcs_write64(GUEST_BNDCFGS, 0);
vmx_setup_uret_msrs(vmx);
if (cpu_has_vmx_msr_bitmap())
vmx_update_msr_bitmap(&vmx->vcpu);