[PATCH] x86: Drop unused evaluations from IO handlers

[PATCH] x86: Drop unused evaluations from IO handlers

[Jan Kiszka]

Looks like neither the direction nor the rep prefix are used anymore.
Drop related evaluations from SVM's and VMX's I/O exit handlers.
---

 arch/x86/kvm/svm.c |    4 +---
 arch/x86/kvm/vmx.c |    4 +---
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 1c4a018..22e88a4 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1194,7 +1194,7 @@ static int shutdown_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 static int io_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 {
 	u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
-	int size, down, in, string, rep;
+	int size, in, string;
 	unsigned port;
 
 	++svm->vcpu.stat.io_exits;
@@ -1213,8 +1213,6 @@ static int io_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 	in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
 	port = io_info >> 16;
 	size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
-	rep = (io_info & SVM_IOIO_REP_MASK) != 0;
-	down = (svm->vmcb->save.rflags & X86_EFLAGS_DF) != 0;
 
 	skip_emulated_instruction(&svm->vcpu);
 	return kvm_emulate_pio(&svm->vcpu, kvm_run, in, size, port);
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9913a1d..bd7097d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2697,7 +2697,7 @@ static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 {
 	unsigned long exit_qualification;
-	int size, down, in, string, rep;
+	int size, in, string;
 	unsigned port;
 
 	++vcpu->stat.io_exits;
@@ -2713,8 +2713,6 @@ static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 
 	size = (exit_qualification & 7) + 1;
 	in = (exit_qualification & 8) != 0;
-	down = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
-	rep = (exit_qualification & 32) != 0;
 	port = exit_qualification >> 16;
 
 	skip_emulated_instruction(vcpu);

Re: [PATCH] x86: Drop unused evaluations from IO handlers

[Avi Kivity]

Jan Kiszka wrote:
> Looks like neither the direction nor the rep prefix are used anymore.
>   

Right, this was due to both vmx and svm not fully decoding string pio 
instructions.

> Drop related evaluations from SVM's and VMX's I/O exit handlers.
>   

Missing signoff.

-- 
error compiling committee.c: too many arguments to function

Re: [PATCH] x86: Drop unused evaluations from IO handlers

[Jan Kiszka]

Avi Kivity wrote:
> Jan Kiszka wrote:
>> Looks like neither the direction nor the rep prefix are used anymore.
>>   
> 
> Right, this was due to both vmx and svm not fully decoding string pio
> instructions.
> 
>> Drop related evaluations from SVM's and VMX's I/O exit handlers.
>>   
> 
> Missing signoff.
> 

Ooops.

-------->

Looks like neither the direction nor the rep prefix are used anymore.
Drop related evaluations from SVM's and VMX's I/O exit handlers.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---

 arch/x86/kvm/svm.c |    4 +---
 arch/x86/kvm/vmx.c |    4 +---
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 1c4a018..22e88a4 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1194,7 +1194,7 @@ static int shutdown_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 static int io_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 {
 	u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
-	int size, down, in, string, rep;
+	int size, in, string;
 	unsigned port;
 
 	++svm->vcpu.stat.io_exits;
@@ -1213,8 +1213,6 @@ static int io_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 	in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
 	port = io_info >> 16;
 	size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
-	rep = (io_info & SVM_IOIO_REP_MASK) != 0;
-	down = (svm->vmcb->save.rflags & X86_EFLAGS_DF) != 0;
 
 	skip_emulated_instruction(&svm->vcpu);
 	return kvm_emulate_pio(&svm->vcpu, kvm_run, in, size, port);
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9913a1d..bd7097d 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2697,7 +2697,7 @@ static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 {
 	unsigned long exit_qualification;
-	int size, down, in, string, rep;
+	int size, in, string;
 	unsigned port;
 
 	++vcpu->stat.io_exits;
@@ -2713,8 +2713,6 @@ static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 
 	size = (exit_qualification & 7) + 1;
 	in = (exit_qualification & 8) != 0;
-	down = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
-	rep = (exit_qualification & 32) != 0;
 	port = exit_qualification >> 16;
 
 	skip_emulated_instruction(vcpu);

Re: [PATCH] x86: Drop unused evaluations from IO handlers

[Avi Kivity]

Jan Kiszka wrote:
>
> Looks like neither the direction nor the rep prefix are used anymore.
> Drop related evaluations from SVM's and VMX's I/O exit handlers.
>   

Applied, thanks.

-- 
error compiling committee.c: too many arguments to function