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
next prev 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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