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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 4/7] KVM: SVM: replace argument of __svm_vcpu_run with vcpu_svm
Date:   Fri, 28 Oct 2022 19:07:20 -0400
Message-Id: <20221028230723.3254250-5-pbonzini@redhat.com>
In-Reply-To: <20221028230723.3254250-1-pbonzini@redhat.com>
References: <20221028230723.3254250-1-pbonzini@redhat.com>
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Since registers are reachable through vcpu_svm, and we will
need to access more fields of that struct, pass it instead
of the regs[] array.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/kernel/asm-offsets.c |  6 ++++++
 arch/x86/kvm/svm/svm.c        |  2 +-
 arch/x86/kvm/svm/svm.h        |  2 +-
 arch/x86/kvm/svm/vmenter.S    | 36 +++++++++++++++++------------------
 4 files changed, 26 insertions(+), 20 deletions(-)

diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
index 90da275ad223..7f1dd1138117 100644
--- a/arch/x86/kernel/asm-offsets.c
+++ b/arch/x86/kernel/asm-offsets.c
@@ -20,6 +20,7 @@
 #include <asm/tlbflush.h>
 #include <asm/tdx.h>
 #include "../kvm/vmx/vmx.h"
+#include "../kvm/svm/svm.h"
 
 #ifdef CONFIG_XEN
 #include <xen/interface/xen.h>
@@ -109,6 +110,11 @@ static void __used common(void)
 	OFFSET(TSS_sp1, tss_struct, x86_tss.sp1);
 	OFFSET(TSS_sp2, tss_struct, x86_tss.sp2);
 
+	if (IS_ENABLED(CONFIG_KVM_AMD)) {
+		BLANK();
+		OFFSET(SVM_vcpu_arch_regs, vcpu_svm, vcpu.arch.regs);
+	}
+
 	if (IS_ENABLED(CONFIG_KVM_INTEL)) {
 		BLANK();
 		OFFSET(VMX_vcpu_arch_regs, vcpu_vmx, vcpu.arch.regs);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index b793cfdce68d..64f5f0544b4f 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3932,7 +3932,7 @@ static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu)
 		 * vmcb02 when switching vmcbs for nested virtualization.
 		 */
 		vmload(svm->vmcb01.pa);
-		__svm_vcpu_run(vmcb_pa, (unsigned long *)&vcpu->arch.regs);
+		__svm_vcpu_run(vmcb_pa, svm);
 		vmsave(svm->vmcb01.pa);
 
 		vmload(__sme_page_pa(sd->save_area));
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 222856788153..5f8dfc9cd9a7 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -484,6 +484,6 @@ void sev_es_unmap_ghcb(struct vcpu_svm *svm);
 /* vmenter.S */
 
 void __svm_sev_es_vcpu_run(unsigned long vmcb_pa);
-void __svm_vcpu_run(unsigned long vmcb_pa, unsigned long *regs);
+void __svm_vcpu_run(unsigned long vmcb_pa, struct vcpu_svm *svm);
 
 #endif
diff --git a/arch/x86/kvm/svm/vmenter.S b/arch/x86/kvm/svm/vmenter.S
index 723f8534986c..8fac744361e5 100644
--- a/arch/x86/kvm/svm/vmenter.S
+++ b/arch/x86/kvm/svm/vmenter.S
@@ -8,23 +8,23 @@
 #define WORD_SIZE (BITS_PER_LONG / 8)
 
 /* Intentionally omit RAX as it's context switched by hardware */
-#define VCPU_RCX	__VCPU_REGS_RCX * WORD_SIZE
-#define VCPU_RDX	__VCPU_REGS_RDX * WORD_SIZE
-#define VCPU_RBX	__VCPU_REGS_RBX * WORD_SIZE
+#define VCPU_RCX	(SVM_vcpu_arch_regs + __VCPU_REGS_RCX * WORD_SIZE)
+#define VCPU_RDX	(SVM_vcpu_arch_regs + __VCPU_REGS_RDX * WORD_SIZE)
+#define VCPU_RBX	(SVM_vcpu_arch_regs + __VCPU_REGS_RBX * WORD_SIZE)
 /* Intentionally omit RSP as it's context switched by hardware */
-#define VCPU_RBP	__VCPU_REGS_RBP * WORD_SIZE
-#define VCPU_RSI	__VCPU_REGS_RSI * WORD_SIZE
-#define VCPU_RDI	__VCPU_REGS_RDI * WORD_SIZE
+#define VCPU_RBP	(SVM_vcpu_arch_regs + __VCPU_REGS_RBP * WORD_SIZE)
+#define VCPU_RSI	(SVM_vcpu_arch_regs + __VCPU_REGS_RSI * WORD_SIZE)
+#define VCPU_RDI	(SVM_vcpu_arch_regs + __VCPU_REGS_RDI * WORD_SIZE)
 
 #ifdef CONFIG_X86_64
-#define VCPU_R8		__VCPU_REGS_R8  * WORD_SIZE
-#define VCPU_R9		__VCPU_REGS_R9  * WORD_SIZE
-#define VCPU_R10	__VCPU_REGS_R10 * WORD_SIZE
-#define VCPU_R11	__VCPU_REGS_R11 * WORD_SIZE
-#define VCPU_R12	__VCPU_REGS_R12 * WORD_SIZE
-#define VCPU_R13	__VCPU_REGS_R13 * WORD_SIZE
-#define VCPU_R14	__VCPU_REGS_R14 * WORD_SIZE
-#define VCPU_R15	__VCPU_REGS_R15 * WORD_SIZE
+#define VCPU_R8		(SVM_vcpu_arch_regs + __VCPU_REGS_R8  * WORD_SIZE)
+#define VCPU_R9		(SVM_vcpu_arch_regs + __VCPU_REGS_R9  * WORD_SIZE)
+#define VCPU_R10	(SVM_vcpu_arch_regs + __VCPU_REGS_R10 * WORD_SIZE)
+#define VCPU_R11	(SVM_vcpu_arch_regs + __VCPU_REGS_R11 * WORD_SIZE)
+#define VCPU_R12	(SVM_vcpu_arch_regs + __VCPU_REGS_R12 * WORD_SIZE)
+#define VCPU_R13	(SVM_vcpu_arch_regs + __VCPU_REGS_R13 * WORD_SIZE)
+#define VCPU_R14	(SVM_vcpu_arch_regs + __VCPU_REGS_R14 * WORD_SIZE)
+#define VCPU_R15	(SVM_vcpu_arch_regs + __VCPU_REGS_R15 * WORD_SIZE)
 #endif
 
 .section .noinstr.text, "ax"
@@ -32,7 +32,7 @@
 /**
  * __svm_vcpu_run - Run a vCPU via a transition to SVM guest mode
  * @vmcb_pa:	unsigned long
- * @regs:	unsigned long * (to guest registers)
+ * @svm:	struct vcpu_svm *
  */
 SYM_FUNC_START(__svm_vcpu_run)
 	push %_ASM_BP
@@ -47,13 +47,13 @@ SYM_FUNC_START(__svm_vcpu_run)
 #endif
 	push %_ASM_BX
 
-	/* Save @regs. */
+	/* Save @svm. */
 	push %_ASM_ARG2
 
 	/* Save @vmcb. */
 	push %_ASM_ARG1
 
-	/* Move @regs to RAX. */
+	/* Move @svm to RAX. */
 	mov %_ASM_ARG2, %_ASM_AX
 
 	/* Load guest registers. */
@@ -89,7 +89,7 @@ SYM_FUNC_START(__svm_vcpu_run)
 	FILL_RETURN_BUFFER %_ASM_AX, RSB_CLEAR_LOOPS, X86_FEATURE_RETPOLINE
 #endif
 
-	/* "POP" @regs to RAX. */
+	/* "POP" @svm to RAX. */
 	pop %_ASM_AX
 
 	/* Save all guest registers.  */
-- 
2.31.1