From 0460a979b4b7a564e59eaa8efbba6f5ae38c5b78 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Fri, 7 Aug 2009 11:49:31 +0200 Subject: [PATCH] KVM: SVM: copy only necessary parts of the control area on vmrun/vmexit 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 Acked-by: Alexander Graf Signed-off-by: Avi Kivity --- arch/x86/kvm/svm.c | 36 ++++++++++++++++++++++++++++++++++-- 1 file changed, 34 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index f11f88005c29..df795bcebd22 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1567,6 +1567,38 @@ 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) { @@ -1612,7 +1644,7 @@ 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) @@ -1710,7 +1742,7 @@ 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; -- 2.39.5