KVM: SVM: optimize nested #vmexit

It is more efficient to copy only the relevant parts of the vmcb back to
the nested vmcb when we emulate an vmexit.

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

1 files changed, 33 insertions, 35 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 9f7277273a23..2f5f2236f2a2 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1572,53 +1572,52 @@ static int nested_svm_vmexit_real(struct vcpu_svm *svm, void *arg1,
 {
         struct vmcb *nested_vmcb = (struct vmcb *)arg1;
         struct vmcb *hsave = svm->hsave;
-        u64 nested_save[] = { nested_vmcb->save.cr0,
-                              nested_vmcb->save.cr3,
-                              nested_vmcb->save.cr4,
-                              nested_vmcb->save.efer,
-                              nested_vmcb->control.intercept_cr_read,
-                              nested_vmcb->control.intercept_cr_write,
-                              nested_vmcb->control.intercept_dr_read,
-                              nested_vmcb->control.intercept_dr_write,
-                              nested_vmcb->control.intercept_exceptions,
-                              nested_vmcb->control.intercept,
-                              nested_vmcb->control.msrpm_base_pa,
-                              nested_vmcb->control.iopm_base_pa,
-                              nested_vmcb->control.tsc_offset };
+        struct vmcb *vmcb = svm->vmcb;
 
         /* Give the current vmcb to the guest */
-        memcpy(nested_vmcb, svm->vmcb, sizeof(struct vmcb));
-        nested_vmcb->save.cr0 = nested_save[0];
-        if (!npt_enabled)
-                nested_vmcb->save.cr3 = nested_save[1];
-        nested_vmcb->save.cr4 = nested_save[2];
-        nested_vmcb->save.efer = nested_save[3];
-        nested_vmcb->control.intercept_cr_read = nested_save[4];
-        nested_vmcb->control.intercept_cr_write = nested_save[5];
-        nested_vmcb->control.intercept_dr_read = nested_save[6];
-        nested_vmcb->control.intercept_dr_write = nested_save[7];
-        nested_vmcb->control.intercept_exceptions = nested_save[8];
-        nested_vmcb->control.intercept = nested_save[9];
-        nested_vmcb->control.msrpm_base_pa = nested_save[10];
-        nested_vmcb->control.iopm_base_pa = nested_save[11];
-        nested_vmcb->control.tsc_offset = nested_save[12];
+        disable_gif(svm);
+
+        nested_vmcb->save.es     = vmcb->save.es;
+        nested_vmcb->save.cs     = vmcb->save.cs;
+        nested_vmcb->save.ss     = vmcb->save.ss;
+        nested_vmcb->save.ds     = vmcb->save.ds;
+        nested_vmcb->save.gdtr   = vmcb->save.gdtr;
+        nested_vmcb->save.idtr   = vmcb->save.idtr;
+        if (npt_enabled)
+                nested_vmcb->save.cr3    = vmcb->save.cr3;
+        nested_vmcb->save.cr2    = vmcb->save.cr2;
+        nested_vmcb->save.rflags = vmcb->save.rflags;
+        nested_vmcb->save.rip    = vmcb->save.rip;
+        nested_vmcb->save.rsp    = vmcb->save.rsp;
+        nested_vmcb->save.rax    = vmcb->save.rax;
+        nested_vmcb->save.dr7    = vmcb->save.dr7;
+        nested_vmcb->save.dr6    = vmcb->save.dr6;
+        nested_vmcb->save.cpl    = vmcb->save.cpl;
+
+        nested_vmcb->control.int_ctl           = vmcb->control.int_ctl;
+        nested_vmcb->control.int_vector        = vmcb->control.int_vector;
+        nested_vmcb->control.int_state         = vmcb->control.int_state;
+        nested_vmcb->control.exit_code         = vmcb->control.exit_code;
+        nested_vmcb->control.exit_code_hi      = vmcb->control.exit_code_hi;
+        nested_vmcb->control.exit_info_1       = vmcb->control.exit_info_1;
+        nested_vmcb->control.exit_info_2       = vmcb->control.exit_info_2;
+        nested_vmcb->control.exit_int_info     = vmcb->control.exit_int_info;
+        nested_vmcb->control.exit_int_info_err = vmcb->control.exit_int_info_err;
+        nested_vmcb->control.tlb_ctl           = 0;
+        nested_vmcb->control.event_inj         = 0;
+        nested_vmcb->control.event_inj_err     = 0;
 
         /* We always set V_INTR_MASKING and remember the old value in hflags */
         if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
                 nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
 
-        if ((nested_vmcb->control.int_ctl & V_IRQ_MASK) &&
-            (nested_vmcb->control.int_vector)) {
-                nsvm_printk("WARNING: IRQ 0x%x still enabled on #VMEXIT\n",
-                                nested_vmcb->control.int_vector);
-        }
-
         /* Restore the original control entries */
         svm->vmcb->control = hsave->control;
 
         /* Kill any pending exceptions */
         if (svm->vcpu.arch.exception.pending == true)
                 nsvm_printk("WARNING: Pending Exception\n");
+
         kvm_clear_exception_queue(&svm->vcpu);
         kvm_clear_interrupt_queue(&svm->vcpu);
 
@@ -1646,7 +1645,6 @@ static int nested_svm_vmexit_real(struct vcpu_svm *svm, void *arg1,
         svm->vmcb->save.cpl = 0;
         svm->vmcb->control.exit_int_info = 0;
 
-        disable_gif(svm);
         /* Exit nested SVM mode */
         svm->nested_vmcb = 0;