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

Add kvm_fast_pio() to consolidate duplicate code in VMX and SVM.
Unexport kvm_fast_pio_in() and kvm_fast_pio_out().

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 0395c35..dc0ae1b 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1210,8 +1210,7 @@ int kvm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr);
 
 struct x86_emulate_ctxt;
 
-int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port);
-int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, unsigned short port);
+int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in);
 int kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
 int kvm_emulate_halt(struct kvm_vcpu *vcpu);
 int kvm_vcpu_halt(struct kvm_vcpu *vcpu);

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index be9c839..3ce5ba8 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2640,7 +2640,7 @@ static int io_interception(struct vcpu_svm *svm)
 {
        struct kvm_vcpu *vcpu = &svm->vcpu;
        u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
-       int size, in, string, ret;
+       int size, in, string;
        unsigned port;
 
        ++svm->vcpu.stat.io_exits;
@@ -2652,16 +2652,8 @@ static int io_interception(struct vcpu_svm *svm)
        port = io_info >> 16;
        size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
        svm->next_rip = svm->vmcb->control.exit_info_2;
-       ret = kvm_skip_emulated_instruction(&svm->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;
+       return kvm_fast_pio(&svm->vcpu, size, port, in);
 }
 
 static int nmi_interception(struct vcpu_svm *svm)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 8d31e1b..cd71b15 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6265,7 +6265,7 @@ static int handle_triple_fault(struct kvm_vcpu *vcpu)
 static int handle_io(struct kvm_vcpu *vcpu)
 {
        unsigned long exit_qualification;
-       int size, in, string, ret;
+       int size, in, string;
        unsigned port;
 
        exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
@@ -6280,16 +6280,7 @@ static int handle_io(struct kvm_vcpu *vcpu)
        size = (exit_qualification & 7) + 1;
        in = (exit_qualification & 8) != 0;
 
-       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;
+       return kvm_fast_pio(vcpu, size, port, in);
 }
 
 static void

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 36ef3d8..841d9bb 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)
 {