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From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: jmattson@google.com, seanjc@google.com, jpoimboe@kernel.org
Subject: [PATCH 5/7] KVM: SVM: adjust register allocation for __svm_vcpu_run
Date: Fri, 28 Oct 2022 19:07:21 -0400	[thread overview]
Message-ID: <20221028230723.3254250-6-pbonzini@redhat.com> (raw)
In-Reply-To: <20221028230723.3254250-1-pbonzini@redhat.com>

In preparation for moving SPEC_CTRL access to __svm_vcpu_run,
keep the pointer to the struct vcpu_svm in %rdi, which is not
used by rdmsr/wrmsr.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/kvm/svm/vmenter.S | 39 +++++++++++++++++++-------------------
 1 file changed, 20 insertions(+), 19 deletions(-)

diff --git a/arch/x86/kvm/svm/vmenter.S b/arch/x86/kvm/svm/vmenter.S
index 8fac744361e5..51a63a47d74f 100644
--- a/arch/x86/kvm/svm/vmenter.S
+++ b/arch/x86/kvm/svm/vmenter.S
@@ -53,30 +53,31 @@ SYM_FUNC_START(__svm_vcpu_run)
 	/* Save @vmcb. */
 	push %_ASM_ARG1
 
-	/* Move @svm to RAX. */
-	mov %_ASM_ARG2, %_ASM_AX
+	/* Move @svm to RDI. */
+	mov %_ASM_ARG2, %_ASM_DI
 
-	/* Load guest registers. */
-	mov VCPU_RCX(%_ASM_AX), %_ASM_CX
-	mov VCPU_RDX(%_ASM_AX), %_ASM_DX
-	mov VCPU_RBX(%_ASM_AX), %_ASM_BX
-	mov VCPU_RBP(%_ASM_AX), %_ASM_BP
-	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
-#endif
 
 	/* "POP" @vmcb to RAX. */
 	pop %_ASM_AX
 
+	/* Load guest registers. */
+	mov VCPU_RCX(%_ASM_DI), %_ASM_CX
+	mov VCPU_RDX(%_ASM_DI), %_ASM_DX
+	mov VCPU_RBX(%_ASM_DI), %_ASM_BX
+	mov VCPU_RBP(%_ASM_DI), %_ASM_BP
+	mov VCPU_RSI(%_ASM_DI), %_ASM_SI
+#ifdef CONFIG_X86_64
+	mov VCPU_R8 (%_ASM_DI),  %r8
+	mov VCPU_R9 (%_ASM_DI),  %r9
+	mov VCPU_R10(%_ASM_DI), %r10
+	mov VCPU_R11(%_ASM_DI), %r11
+	mov VCPU_R12(%_ASM_DI), %r12
+	mov VCPU_R13(%_ASM_DI), %r13
+	mov VCPU_R14(%_ASM_DI), %r14
+	mov VCPU_R15(%_ASM_DI), %r15
+#endif
+	mov VCPU_RDI(%_ASM_DI), %_ASM_DI
+
 	/* Enter guest mode */
 	sti
 
-- 
2.31.1



  parent reply	other threads:[~2022-10-28 23:09 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-28 23:07 [RFC PATCH 0/7] KVM: SVM: move MSR_IA32_SPEC_CTRL save/restore to assembly Paolo Bonzini
2022-10-28 23:07 ` [PATCH 1/7] KVM: VMX: remove regs argument of __vmx_vcpu_run Paolo Bonzini
2022-10-31 17:37   ` Sean Christopherson
2022-11-01 17:32     ` Josh Poimboeuf
2022-11-01 18:03       ` Sean Christopherson
2022-11-02 17:42     ` Paolo Bonzini
2022-10-28 23:07 ` [PATCH 2/7] KVM: VMX: more cleanups to __vmx_vcpu_run Paolo Bonzini
2022-10-28 23:07 ` [PATCH 3/7] KVM: SVM: extract VMCB accessors to a new file Paolo Bonzini
2022-10-28 23:07 ` [PATCH 4/7] KVM: SVM: replace argument of __svm_vcpu_run with vcpu_svm Paolo Bonzini
2022-10-29 22:10   ` kernel test robot
2022-10-28 23:07 ` Paolo Bonzini [this message]
2022-10-28 23:07 ` [PATCH 6/7] KVM: SVM: move MSR_IA32_SPEC_CTRL save/restore to assembly Paolo Bonzini
2022-10-30  8:36   ` kernel test robot
2022-11-02 15:28   ` Josh Poimboeuf
2022-11-02 16:02     ` Paolo Bonzini
2022-10-28 23:07 ` [PATCH 7/7] x86, KVM: remove unnecessary argument to x86_virt_spec_ctrl and callers Paolo Bonzini

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