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 <joerg.roedel@amd.com>
Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index f11f88005c29e1add1db572b01126ae38a91e2ef..df795bcebd22788e6490423206ce8b61c09f8236 100644 (file)
--- 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;