KVM: x86: add kvm_fast_pio() to consolidate fast PIO code

[mirror_ubuntu-disco-kernel.git] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 36ef3d8aad18dec85f7db33cdfc40238386f5330..841d9bb2d68c49097d2cb390a8d5a5a96cfb7b79 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6061,7 +6061,8 @@ restart:
 }
 EXPORT_SYMBOL_GPL(x86_emulate_instruction);
 
-int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
+static int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size,
+                           unsigned short port)
 {
        unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);
        int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt,
@@ -6070,7 +6071,6 @@ int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
        vcpu->arch.pio.count = 0;
        return ret;
 }
-EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
 
 static int complete_fast_pio_in(struct kvm_vcpu *vcpu)
 {
@@ -6094,7 +6094,8 @@ static int complete_fast_pio_in(struct kvm_vcpu *vcpu)
        return 1;
 }
 
-int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, unsigned short port)
+static int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size,
+                          unsigned short port)
 {
        unsigned long val;
        int ret;
@@ -6113,7 +6114,21 @@ int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, unsigned short port)
 
        return 0;
 }
-EXPORT_SYMBOL_GPL(kvm_fast_pio_in);
+
+int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in)
+{
+       int ret = kvm_skip_emulated_instruction(vcpu);
+
+       /*
+        * TODO: we might be squashing a KVM_GUESTDBG_SINGLESTEP-triggered
+        * KVM_EXIT_DEBUG here.
+        */
+       if (in)
+               return kvm_fast_pio_in(vcpu, size, port) && ret;
+       else
+               return kvm_fast_pio_out(vcpu, size, port) && ret;
+}
+EXPORT_SYMBOL_GPL(kvm_fast_pio);
 
 static int kvmclock_cpu_down_prep(unsigned int cpu)
 {