KVM: x86: avoid useless set of KVM_REQ_EVENT after emulation

Despite the provisions to emulate up to 130 consecutive instructions, in
practice KVM will emulate just one before exiting handle_invalid_guest_state,
because x86_emulate_instruction always sets KVM_REQ_EVENT.

However, we only need to do this if an interrupt could be injected,
which happens a) if an interrupt shadow bit (STI or MOV SS) has gone
away; b) if the interrupt flag has just been set (other instructions
than STI can set it without enabling an interrupt shadow).

This cuts another 700-900 cycles from the cost of emulating an
instruction (measured on a Sandy Bridge Xeon: 1650-2600 cycles
before the patch on kvm-unit-tests, 925-1700 afterwards).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 26 insertions, 10 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a56126e6bd75..cd9316786dca 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -87,6 +87,7 @@ static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE);
 
 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
 static void process_nmi(struct kvm_vcpu *vcpu);
+static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
 
 struct kvm_x86_ops *kvm_x86_ops;
 EXPORT_SYMBOL_GPL(kvm_x86_ops);
@@ -4868,8 +4869,11 @@ static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
          */
         if (int_shadow & mask)
                 mask = 0;
-        if (unlikely(int_shadow || mask))
+        if (unlikely(int_shadow || mask)) {
                 kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
+                if (!mask)
+                        kvm_make_request(KVM_REQ_EVENT, vcpu);
+        }
 }
 
 static void inject_emulated_exception(struct kvm_vcpu *vcpu)
@@ -5095,20 +5099,18 @@ static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7,
         return dr6;
 }
 
-static void kvm_vcpu_check_singlestep(struct kvm_vcpu *vcpu, int *r)
+static void kvm_vcpu_check_singlestep(struct kvm_vcpu *vcpu, unsigned long rflags, int *r)
 {
         struct kvm_run *kvm_run = vcpu->run;
 
         /*
-         * Use the "raw" value to see if TF was passed to the processor.
-         * Note that the new value of the flags has not been saved yet.
+         * rflags is the old, "raw" value of the flags.  The new value has
+         * not been saved yet.
          *
          * This is correct even for TF set by the guest, because "the
          * processor will not generate this exception after the instruction
          * that sets the TF flag".
          */
-        unsigned long rflags = kvm_x86_ops->get_rflags(vcpu);
-
         if (unlikely(rflags & X86_EFLAGS_TF)) {
                 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
                         kvm_run->debug.arch.dr6 = DR6_BS | DR6_FIXED_1;
@@ -5275,13 +5277,22 @@ restart:
                 r = EMULATE_DONE;
 
         if (writeback) {
+                unsigned long rflags = kvm_x86_ops->get_rflags(vcpu);
                 toggle_interruptibility(vcpu, ctxt->interruptibility);
-                kvm_make_request(KVM_REQ_EVENT, vcpu);
                 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
                 kvm_rip_write(vcpu, ctxt->eip);
                 if (r == EMULATE_DONE)
-                        kvm_vcpu_check_singlestep(vcpu, &r);
-                kvm_set_rflags(vcpu, ctxt->eflags);
+                        kvm_vcpu_check_singlestep(vcpu, rflags, &r);
+                __kvm_set_rflags(vcpu, ctxt->eflags);
+
+                /*
+                 * For STI, interrupts are shadowed; so KVM_REQ_EVENT will
+                 * do nothing, and it will be requested again as soon as
+                 * the shadow expires.  But we still need to check here,
+                 * because POPF has no interrupt shadow.
+                 */
+                if (unlikely((ctxt->eflags & ~rflags) & X86_EFLAGS_IF))
+                        kvm_make_request(KVM_REQ_EVENT, vcpu);
         } else
                 vcpu->arch.emulate_regs_need_sync_to_vcpu = true;
 
@@ -7406,12 +7417,17 @@ unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_GPL(kvm_get_rflags);
 
-void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
+static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
 {
         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
             kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
                 rflags |= X86_EFLAGS_TF;
         kvm_x86_ops->set_rflags(vcpu, rflags);
+}
+
+void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
+{
+        __kvm_set_rflags(vcpu, rflags);
         kvm_make_request(KVM_REQ_EVENT, vcpu);
 }
 EXPORT_SYMBOL_GPL(kvm_set_rflags);