From: Uros Bizjak <ubizjak@gmail.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Uros Bizjak <ubizjak@gmail.com>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>
Subject: [PATCH] KVM/SVM: Move vmenter.S exception fixups out of line
Date: Fri, 26 Feb 2021 13:56:21 +0100 [thread overview]
Message-ID: <20210226125621.111723-1-ubizjak@gmail.com> (raw)
Avoid jump by moving exception fixups out of line.
Cc: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
---
arch/x86/kvm/svm/vmenter.S | 35 ++++++++++++++++++++---------------
1 file changed, 20 insertions(+), 15 deletions(-)
diff --git a/arch/x86/kvm/svm/vmenter.S b/arch/x86/kvm/svm/vmenter.S
index 343108bf0f8c..4fa17df123cd 100644
--- a/arch/x86/kvm/svm/vmenter.S
+++ b/arch/x86/kvm/svm/vmenter.S
@@ -80,15 +80,9 @@ SYM_FUNC_START(__svm_vcpu_run)
/* Enter guest mode */
sti
-3: vmrun %_ASM_AX
- jmp 5f
-4: cmpb $0, kvm_rebooting
- jne 5f
- ud2
- _ASM_EXTABLE(3b, 4b)
+1: vmrun %_ASM_AX
-5:
- cli
+2: cli
#ifdef CONFIG_RETPOLINE
/* IMPORTANT: Stuff the RSB immediately after VM-Exit, before RET! */
@@ -155,6 +149,13 @@ SYM_FUNC_START(__svm_vcpu_run)
#endif
pop %_ASM_BP
ret
+
+3: cmpb $0, kvm_rebooting
+ jne 2b
+ ud2
+
+ _ASM_EXTABLE(1b, 3b)
+
SYM_FUNC_END(__svm_vcpu_run)
/**
@@ -174,18 +175,15 @@ SYM_FUNC_START(__svm_sev_es_vcpu_run)
#endif
push %_ASM_BX
- /* Enter guest mode */
+ /* Move @vmcb to RAX. */
mov %_ASM_ARG1, %_ASM_AX
+
+ /* Enter guest mode */
sti
1: vmrun %_ASM_AX
- jmp 3f
-2: cmpb $0, kvm_rebooting
- jne 3f
- ud2
- _ASM_EXTABLE(1b, 2b)
-3: cli
+2: cli
#ifdef CONFIG_RETPOLINE
/* IMPORTANT: Stuff the RSB immediately after VM-Exit, before RET! */
@@ -205,4 +203,11 @@ SYM_FUNC_START(__svm_sev_es_vcpu_run)
#endif
pop %_ASM_BP
ret
+
+3: cmpb $0, kvm_rebooting
+ jne 2b
+ ud2
+
+ _ASM_EXTABLE(1b, 3b)
+
SYM_FUNC_END(__svm_sev_es_vcpu_run)
--
2.29.2
next reply other threads:[~2021-02-26 12:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-26 12:56 Uros Bizjak [this message]
2021-02-26 13:46 ` [PATCH] KVM/SVM: Move vmenter.S exception fixups out of line Paolo Bonzini
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