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KVM: nSVM: only copy L1 non-VMLOAD/VMSAVE data in svm_set_nested_state()

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The VMLOAD/VMSAVE data is not taken from userspace, since it will
not be restored on VMEXIT (it will be copied from VMCB02 to VMCB01).
For clarity, replace the wholesale copy of the VMCB save area
with a copy of that state only.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2020-11-17 02:51:35 -05:00
parent 4bb170a543
commit c08f390a75
1 changed files with 18 additions and 2 deletions
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20
arch/x86/kvm/svm/nested.c
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@ -717,7 +717,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
/*
* Restore processor state that had been saved in vmcb01
*/
kvm_set_rflags(&svm->vcpu, svm->vmcb->save.rflags | X86_EFLAGS_FIXED);
kvm_set_rflags(&svm->vcpu, svm->vmcb->save.rflags);
svm_set_efer(&svm->vcpu, svm->vmcb->save.efer);
svm_set_cr0(&svm->vcpu, svm->vmcb->save.cr0 | X86_CR0_PE);
svm_set_cr4(&svm->vcpu, svm->vmcb->save.cr4);
@ -1252,7 +1252,23 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
svm->nested.vmcb12_gpa = kvm_state->hdr.svm.vmcb_pa;
if (svm->current_vmcb == &svm->vmcb01)
svm->nested.vmcb02.ptr->save = svm->vmcb01.ptr->save;
svm->vmcb01.ptr->save = *save;
svm->vmcb01.ptr->save.es = save->es;
svm->vmcb01.ptr->save.cs = save->cs;
svm->vmcb01.ptr->save.ss = save->ss;
svm->vmcb01.ptr->save.ds = save->ds;
svm->vmcb01.ptr->save.gdtr = save->gdtr;
svm->vmcb01.ptr->save.idtr = save->idtr;
svm->vmcb01.ptr->save.rflags = save->rflags | X86_EFLAGS_FIXED;
svm->vmcb01.ptr->save.efer = save->efer;
svm->vmcb01.ptr->save.cr0 = save->cr0;
svm->vmcb01.ptr->save.cr3 = save->cr3;
svm->vmcb01.ptr->save.cr4 = save->cr4;
svm->vmcb01.ptr->save.rax = save->rax;
svm->vmcb01.ptr->save.rsp = save->rsp;
svm->vmcb01.ptr->save.rip = save->rip;
svm->vmcb01.ptr->save.cpl = 0;
nested_load_control_from_vmcb12(svm, ctl);
svm_switch_vmcb(svm, &svm->nested.vmcb02);