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KVM: nSVM: set fixed bits by hand

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SVM generally ignores fixed-1 bits.  Set them manually so that we
do not end up by mistake without those bits set in struct kvm_vcpu;
it is part of userspace API that KVM always returns value with the
bits set.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2020-11-27 12:46:36 -05:00
parent b9a98c3437
commit 8cce12b3c8
1 changed files with 5 additions and 4 deletions
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9
arch/x86/kvm/svm/nested.c
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@ -381,7 +381,7 @@ static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *vmcb12)
svm->vmcb->save.ds = vmcb12->save.ds;
svm->vmcb->save.gdtr = vmcb12->save.gdtr;
svm->vmcb->save.idtr = vmcb12->save.idtr;
kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags);
kvm_set_rflags(&svm->vcpu, vmcb12->save.rflags | X86_EFLAGS_FIXED);
svm_set_efer(&svm->vcpu, vmcb12->save.efer);
svm_set_cr0(&svm->vcpu, vmcb12->save.cr0);
svm_set_cr4(&svm->vcpu, vmcb12->save.cr4);
@ -394,8 +394,8 @@ static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *vmcb12)
svm->vmcb->save.rax = vmcb12->save.rax;
svm->vmcb->save.rsp = vmcb12->save.rsp;
svm->vmcb->save.rip = vmcb12->save.rip;
svm->vmcb->save.dr7 = vmcb12->save.dr7;
svm->vcpu.arch.dr6 = vmcb12->save.dr6;
svm->vmcb->save.dr7 = vmcb12->save.dr7 | DR7_FIXED_1;
svm->vcpu.arch.dr6 = vmcb12->save.dr6 | DR6_FIXED_1 | DR6_RTM;
svm->vmcb->save.cpl = vmcb12->save.cpl;
}
@ -660,13 +660,14 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
svm->vmcb->save.gdtr = hsave->save.gdtr;
svm->vmcb->save.idtr = hsave->save.idtr;
kvm_set_rflags(&svm->vcpu, hsave->save.rflags);
kvm_set_rflags(&svm->vcpu, hsave->save.rflags | X86_EFLAGS_FIXED);
svm_set_efer(&svm->vcpu, hsave->save.efer);
svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
svm_set_cr4(&svm->vcpu, hsave->save.cr4);
kvm_rax_write(&svm->vcpu, hsave->save.rax);
kvm_rsp_write(&svm->vcpu, hsave->save.rsp);
kvm_rip_write(&svm->vcpu, hsave->save.rip);
svm->vmcb->save.dr7 = 0;
svm->vmcb->save.dr7 = DR7_FIXED_1;
svm->vmcb->save.cpl = 0;
svm->vmcb->control.exit_int_info = 0;