The vmcb control area contains more then 800 bytes of reserved fields
which are unnecessarily copied. Fix this by introducing a copy
function which only copies the relevant part and saves time.
Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
Acked-by: Alexander Graf <agraf@xxxxxxx>
---
arch/x86/kvm/svm.c | 36 ++++++++++++++++++++++++++++++++++--
1 files changed, 34 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index d4011cc..e656425 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1570,6 +1570,38 @@ static int nested_svm_exit_handled(struct vcpu_svm *svm, bool kvm_override)
nested_svm_exit_handled_real);
}
+static inline void copy_vmcb_control_area(struct vmcb *dst_vmcb, struct vmcb *from_vmcb)
+{
+ struct vmcb_control_area *dst = &dst_vmcb->control;
+ struct vmcb_control_area *from = &from_vmcb->control;
+
+ dst->intercept_cr_read = from->intercept_cr_read;
+ dst->intercept_cr_write = from->intercept_cr_write;
+ dst->intercept_dr_read = from->intercept_dr_read;
+ dst->intercept_dr_write = from->intercept_dr_write;
+ dst->intercept_exceptions = from->intercept_exceptions;
+ dst->intercept = from->intercept;
+ dst->iopm_base_pa = from->iopm_base_pa;
+ dst->msrpm_base_pa = from->msrpm_base_pa;
+ dst->tsc_offset = from->tsc_offset;
+ dst->asid = from->asid;
+ dst->tlb_ctl = from->tlb_ctl;
+ dst->int_ctl = from->int_ctl;
+ dst->int_vector = from->int_vector;
+ dst->int_state = from->int_state;
+ dst->exit_code = from->exit_code;
+ dst->exit_code_hi = from->exit_code_hi;
+ dst->exit_info_1 = from->exit_info_1;
+ dst->exit_info_2 = from->exit_info_2;
+ dst->exit_int_info = from->exit_int_info;
+ dst->exit_int_info_err = from->exit_int_info_err;
+ dst->nested_ctl = from->nested_ctl;
+ dst->event_inj = from->event_inj;
+ dst->event_inj_err = from->event_inj_err;
+ dst->nested_cr3 = from->nested_cr3;
+ dst->lbr_ctl = from->lbr_ctl;
+}
+
static int nested_svm_vmexit_real(struct vcpu_svm *svm, void *arg1,
void *arg2, void *opaque)
{
@@ -1615,7 +1647,7 @@ static int nested_svm_vmexit_real(struct vcpu_svm *svm, void *arg1,
nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
/* Restore the original control entries */
- svm->vmcb->control = hsave->control;
+ copy_vmcb_control_area(vmcb, hsave);
/* Kill any pending exceptions */
if (svm->vcpu.arch.exception.pending == true)
@@ -1713,7 +1745,7 @@ static int nested_svm_vmrun(struct vcpu_svm *svm, void *arg1,
else
hsave->save.cr3 = svm->vcpu.arch.cr3;
- hsave->control = vmcb->control;
+ copy_vmcb_control_area(hsave, vmcb);
if (svm->vmcb->save.rflags & X86_EFLAGS_IF)
svm->vcpu.arch.hflags |= HF_HIF_MASK;
--
1.6.3.3
--
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