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KVM: nSVM: introduce nested_svm_load_cr3()/nested_npt_enabled()

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As a preparatory change for implementing nSVM-specific PGD switch
(following nVMX' nested_vmx_load_cr3()), introduce nested_svm_load_cr3()
instead of relying on kvm_set_cr3().

No functional change intended.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200710141157.1640173-6-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2020-07-10 16:11:53 +02:00 committed by Paolo Bonzini
parent 59cd9bc5b0
commit 62156f6cd1
1 changed files with 19 additions and 2 deletions
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21
arch/x86/kvm/svm/nested.c
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@ -336,6 +336,21 @@ static void nested_vmcb_save_pending_event(struct vcpu_svm *svm,
nested_vmcb->control.exit_int_info = exit_int_info;
}
static inline bool nested_npt_enabled(struct vcpu_svm *svm)
{
return svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE;
}
/*
* Load guest's cr3 at nested entry. @nested_npt is true if we are
* emulating VM-Entry into a guest with NPT enabled.
*/
static int nested_svm_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
bool nested_npt)
{
return kvm_set_cr3(vcpu, cr3);
}
static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *nested_vmcb)
{
/* Load the nested guest state */
@ -349,7 +364,8 @@ static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *nested_v
svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
(void)kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
(void)nested_svm_load_cr3(&svm->vcpu, nested_vmcb->save.cr3,
nested_npt_enabled(svm));
svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
kvm_rax_write(&svm->vcpu, nested_vmcb->save.rax);
@ -368,7 +384,8 @@ static void nested_prepare_vmcb_save(struct vcpu_svm *svm, struct vmcb *nested_v
static void nested_prepare_vmcb_control(struct vcpu_svm *svm)
{
const u32 mask = V_INTR_MASKING_MASK | V_GIF_ENABLE_MASK | V_GIF_MASK;
if (svm->nested.ctl.nested_ctl & SVM_NESTED_CTL_NP_ENABLE)
if (nested_npt_enabled(svm))
nested_svm_init_mmu_context(&svm->vcpu);
/* Guest paging mode is active - reset mmu */