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KVM: VMX: Use wrmsr for switching between guest and host IA32_XSS on Intel

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When the guest can execute the XSAVES/XRSTORS instructions, use wrmsr to
set the hardware IA32_XSS MSR to guest/host values on VM-entry/VM-exit,
rather than the MSR-load areas. By using the same approach as AMD, we
will be able to use a common implementation for both (in the next
patch).

Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Change-Id: I9447d104b2615c04e39e4af0c911e1e7309bf464
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Aaron Lewis 2019-10-21 16:30:24 -07:00 committed by Paolo Bonzini
parent 312a1c8779
commit 9753d68865
1 changed files with 18 additions and 7 deletions
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25
arch/x86/kvm/vmx/vmx.c
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@ -2081,13 +2081,6 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (data != 0)
return 1;
vcpu->arch.ia32_xss = data;
if (vcpu->arch.xsaves_enabled) {
if (vcpu->arch.ia32_xss != host_xss)
add_atomic_switch_msr(vmx, MSR_IA32_XSS,
vcpu->arch.ia32_xss, host_xss, false);
else
clear_atomic_switch_msr(vmx, MSR_IA32_XSS);
}
break;
case MSR_IA32_RTIT_CTL:
if ((pt_mode != PT_MODE_HOST_GUEST) ||
@ -6473,6 +6466,22 @@ void vmx_update_host_rsp(struct vcpu_vmx *vmx, unsigned long host_rsp)
}
}
static void vmx_load_guest_xss(struct kvm_vcpu *vcpu)
{
if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
vcpu->arch.xsaves_enabled &&
vcpu->arch.ia32_xss != host_xss)
wrmsrl(MSR_IA32_XSS, vcpu->arch.ia32_xss);
}
static void vmx_load_host_xss(struct kvm_vcpu *vcpu)
{
if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
vcpu->arch.xsaves_enabled &&
vcpu->arch.ia32_xss != host_xss)
wrmsrl(MSR_IA32_XSS, host_xss);
}
bool __vmx_vcpu_run(struct vcpu_vmx *vmx, unsigned long *regs, bool launched);
static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
@ -6524,6 +6533,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
vmx_set_interrupt_shadow(vcpu, 0);
kvm_load_guest_xcr0(vcpu);
vmx_load_guest_xss(vcpu);
if (static_cpu_has(X86_FEATURE_PKU) &&
kvm_read_cr4_bits(vcpu, X86_CR4_PKE) &&
@ -6630,6 +6640,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
__write_pkru(vmx->host_pkru);
}
vmx_load_host_xss(vcpu);
kvm_put_guest_xcr0(vcpu);
vmx->nested.nested_run_pending = 0;