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From: Uros Bizjak <ubizjak@gmail.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Uros Bizjak <ubizjak@gmail.com>, Paolo Bonzini <pbonzini@redhat.com>
Subject: [PATCH] KVM: SVM/VMX: Use %rax instead of %__ASM_AX within CONFIG_X86_64
Date: Wed, 12 May 2021 13:21:15 +0200	[thread overview]
Message-ID: <20210512112115.70048-1-ubizjak@gmail.com> (raw)

There is no need to use %__ASM_AX within CONFIG_X86_64. The macro
will always expand to %rax.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
---
 arch/x86/kvm/svm/vmenter.S | 44 +++++++++++++++++++-------------------
 arch/x86/kvm/vmx/vmenter.S | 32 +++++++++++++--------------
 2 files changed, 38 insertions(+), 38 deletions(-)

diff --git a/arch/x86/kvm/svm/vmenter.S b/arch/x86/kvm/svm/vmenter.S
index 4fa17df123cd..844b558bb021 100644
--- a/arch/x86/kvm/svm/vmenter.S
+++ b/arch/x86/kvm/svm/vmenter.S
@@ -64,14 +64,14 @@ SYM_FUNC_START(__svm_vcpu_run)
 	mov VCPU_RSI(%_ASM_AX), %_ASM_SI
 	mov VCPU_RDI(%_ASM_AX), %_ASM_DI
 #ifdef CONFIG_X86_64
-	mov VCPU_R8 (%_ASM_AX),  %r8
-	mov VCPU_R9 (%_ASM_AX),  %r9
-	mov VCPU_R10(%_ASM_AX), %r10
-	mov VCPU_R11(%_ASM_AX), %r11
-	mov VCPU_R12(%_ASM_AX), %r12
-	mov VCPU_R13(%_ASM_AX), %r13
-	mov VCPU_R14(%_ASM_AX), %r14
-	mov VCPU_R15(%_ASM_AX), %r15
+	mov VCPU_R8 (%rax),  %r8
+	mov VCPU_R9 (%rax),  %r9
+	mov VCPU_R10(%rax), %r10
+	mov VCPU_R11(%rax), %r11
+	mov VCPU_R12(%rax), %r12
+	mov VCPU_R13(%rax), %r13
+	mov VCPU_R14(%rax), %r14
+	mov VCPU_R15(%rax), %r15
 #endif
 
 	/* "POP" @vmcb to RAX. */
@@ -93,21 +93,21 @@ SYM_FUNC_START(__svm_vcpu_run)
 	pop %_ASM_AX
 
 	/* Save all guest registers.  */
-	mov %_ASM_CX,   VCPU_RCX(%_ASM_AX)
-	mov %_ASM_DX,   VCPU_RDX(%_ASM_AX)
-	mov %_ASM_BX,   VCPU_RBX(%_ASM_AX)
-	mov %_ASM_BP,   VCPU_RBP(%_ASM_AX)
-	mov %_ASM_SI,   VCPU_RSI(%_ASM_AX)
-	mov %_ASM_DI,   VCPU_RDI(%_ASM_AX)
+	mov %_ASM_CX, VCPU_RCX(%_ASM_AX)
+	mov %_ASM_DX, VCPU_RDX(%_ASM_AX)
+	mov %_ASM_BX, VCPU_RBX(%_ASM_AX)
+	mov %_ASM_BP, VCPU_RBP(%_ASM_AX)
+	mov %_ASM_SI, VCPU_RSI(%_ASM_AX)
+	mov %_ASM_DI, VCPU_RDI(%_ASM_AX)
 #ifdef CONFIG_X86_64
-	mov %r8,  VCPU_R8 (%_ASM_AX)
-	mov %r9,  VCPU_R9 (%_ASM_AX)
-	mov %r10, VCPU_R10(%_ASM_AX)
-	mov %r11, VCPU_R11(%_ASM_AX)
-	mov %r12, VCPU_R12(%_ASM_AX)
-	mov %r13, VCPU_R13(%_ASM_AX)
-	mov %r14, VCPU_R14(%_ASM_AX)
-	mov %r15, VCPU_R15(%_ASM_AX)
+	mov %r8,  VCPU_R8 (%rax)
+	mov %r9,  VCPU_R9 (%rax)
+	mov %r10, VCPU_R10(%rax)
+	mov %r11, VCPU_R11(%rax)
+	mov %r12, VCPU_R12(%rax)
+	mov %r13, VCPU_R13(%rax)
+	mov %r14, VCPU_R14(%rax)
+	mov %r15, VCPU_R15(%rax)
 #endif
 
 	/*
diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
index 3a6461694fc2..9273709e4800 100644
--- a/arch/x86/kvm/vmx/vmenter.S
+++ b/arch/x86/kvm/vmx/vmenter.S
@@ -142,14 +142,14 @@ SYM_FUNC_START(__vmx_vcpu_run)
 	mov VCPU_RSI(%_ASM_AX), %_ASM_SI
 	mov VCPU_RDI(%_ASM_AX), %_ASM_DI
 #ifdef CONFIG_X86_64
-	mov VCPU_R8 (%_ASM_AX),  %r8
-	mov VCPU_R9 (%_ASM_AX),  %r9
-	mov VCPU_R10(%_ASM_AX), %r10
-	mov VCPU_R11(%_ASM_AX), %r11
-	mov VCPU_R12(%_ASM_AX), %r12
-	mov VCPU_R13(%_ASM_AX), %r13
-	mov VCPU_R14(%_ASM_AX), %r14
-	mov VCPU_R15(%_ASM_AX), %r15
+	mov VCPU_R8 (%rax),  %r8
+	mov VCPU_R9 (%rax),  %r9
+	mov VCPU_R10(%rax), %r10
+	mov VCPU_R11(%rax), %r11
+	mov VCPU_R12(%rax), %r12
+	mov VCPU_R13(%rax), %r13
+	mov VCPU_R14(%rax), %r14
+	mov VCPU_R15(%rax), %r15
 #endif
 	/* Load guest RAX.  This kills the @regs pointer! */
 	mov VCPU_RAX(%_ASM_AX), %_ASM_AX
@@ -175,14 +175,14 @@ SYM_FUNC_START(__vmx_vcpu_run)
 	mov %_ASM_SI, VCPU_RSI(%_ASM_AX)
 	mov %_ASM_DI, VCPU_RDI(%_ASM_AX)
 #ifdef CONFIG_X86_64
-	mov %r8,  VCPU_R8 (%_ASM_AX)
-	mov %r9,  VCPU_R9 (%_ASM_AX)
-	mov %r10, VCPU_R10(%_ASM_AX)
-	mov %r11, VCPU_R11(%_ASM_AX)
-	mov %r12, VCPU_R12(%_ASM_AX)
-	mov %r13, VCPU_R13(%_ASM_AX)
-	mov %r14, VCPU_R14(%_ASM_AX)
-	mov %r15, VCPU_R15(%_ASM_AX)
+	mov %r8,  VCPU_R8 (%rax)
+	mov %r9,  VCPU_R9 (%rax)
+	mov %r10, VCPU_R10(%rax)
+	mov %r11, VCPU_R11(%rax)
+	mov %r12, VCPU_R12(%rax)
+	mov %r13, VCPU_R13(%rax)
+	mov %r14, VCPU_R14(%rax)
+	mov %r15, VCPU_R15(%rax)
 #endif
 
 	/* Clear RAX to indicate VM-Exit (as opposed to VM-Fail). */
-- 
2.31.1


             reply	other threads:[~2021-05-12 11:21 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-12 11:21 Uros Bizjak [this message]
2021-05-12 11:58 ` [PATCH] KVM: SVM/VMX: Use %rax instead of %__ASM_AX within CONFIG_X86_64 Paolo Bonzini
2021-05-12 15:27   ` Sean Christopherson

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