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Subject[PATCH 09/30] KVM: nSVM: extract load_nested_vmcb_control
Date
When restoring SVM nested state, the control state cache in svm->nested
will have to be filled, but the save state will not have to be moved
into svm->vmcb. Therefore, pull the code that handles the control area
into a separate function.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/svm/nested.c | 38 ++++++++++++++++++++++----------------
1 file changed, 22 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 8e98d5e420a5..fc0c6d1678eb 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -228,6 +228,23 @@ static bool nested_vmcb_checks(struct vmcb *vmcb)
return true;
}

+static void load_nested_vmcb_control(struct vcpu_svm *svm,
+ struct vmcb_control_area *control)
+{
+ svm->nested.nested_cr3 = control->nested_cr3;
+
+ svm->nested.vmcb_msrpm = control->msrpm_base_pa & ~0x0fffULL;
+ svm->nested.vmcb_iopm = control->iopm_base_pa & ~0x0fffULL;
+
+ /* cache intercepts */
+ svm->nested.intercept_cr = control->intercept_cr;
+ svm->nested.intercept_dr = control->intercept_dr;
+ svm->nested.intercept_exceptions = control->intercept_exceptions;
+ svm->nested.intercept = control->intercept;
+
+ svm->vcpu.arch.tsc_offset += control->tsc_offset;
+}
+
void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
struct vmcb *nested_vmcb)
{
@@ -235,15 +252,16 @@ void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
is_intercept(svm, INTERCEPT_VINTR) ||
is_intercept(svm, INTERCEPT_IRET);

+ svm->nested.vmcb = vmcb_gpa;
if (kvm_get_rflags(&svm->vcpu) & X86_EFLAGS_IF)
svm->vcpu.arch.hflags |= HF_HIF_MASK;
else
svm->vcpu.arch.hflags &= ~HF_HIF_MASK;

- if (nested_vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE) {
- svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3;
+ load_nested_vmcb_control(svm, &nested_vmcb->control);
+
+ if (nested_vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE)
nested_svm_init_mmu_context(&svm->vcpu);
- }

/* Load the nested guest state */
svm->vmcb->save.es = nested_vmcb->save.es;
@@ -274,25 +292,15 @@ void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
svm->vcpu.arch.dr6 = nested_vmcb->save.dr6;
svm->vmcb->save.cpl = nested_vmcb->save.cpl;

- svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
- svm->nested.vmcb_iopm = nested_vmcb->control.iopm_base_pa & ~0x0fffULL;
-
- /* cache intercepts */
- svm->nested.intercept_cr = nested_vmcb->control.intercept_cr;
- svm->nested.intercept_dr = nested_vmcb->control.intercept_dr;
- svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions;
- svm->nested.intercept = nested_vmcb->control.intercept;
-
svm_flush_tlb(&svm->vcpu);
- svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK)
svm->vcpu.arch.hflags |= HF_VINTR_MASK;
else
svm->vcpu.arch.hflags &= ~HF_VINTR_MASK;

- svm->vcpu.arch.tsc_offset += nested_vmcb->control.tsc_offset;
svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset;

+ svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
svm->vmcb->control.virt_ext = nested_vmcb->control.virt_ext;
svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
svm->vmcb->control.int_state = nested_vmcb->control.int_state;
@@ -313,8 +321,6 @@ void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
*/
recalc_intercepts(svm);

- svm->nested.vmcb = vmcb_gpa;
-
/*
* If L1 had a pending IRQ/NMI before executing VMRUN,
* which wasn't delivered because it was disallowed (e.g.
--
2.26.2

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