Messages in this thread Patch in this message | | | Date | Fri, 23 Feb 2024 12:42:26 -0800 | Subject | [PATCH 1/8] KVM: SVM: Create a stack frame in __svm_vcpu_run() for unwinding | From | Sean Christopherson <> |
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Unconditionally create a stack frame in __svm_vcpu_run() to play nice with unwinding via frame pointers, at least until the point where RBP is loaded with the guest's value. Don't bother conditioning the code on CONFIG_FRAME_POINTER=y, as RBP needs to be saved and restored anyways (due to it being clobbered with the guest's value); omitting the "MOV RSP, RBP" is not worth the extra #ifdef.
Creating a stack frame will allow removing the OBJECT_FILES_NON_STANDARD tag from vmenter.S once __svm_sev_es_vcpu_run() is fixed to not stomp all over RBP for no reason.
Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/x86/kvm/svm/vmenter.S | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/kvm/svm/vmenter.S b/arch/x86/kvm/svm/vmenter.S index 9499f9c6b077..ee5d5a30da88 100644 --- a/arch/x86/kvm/svm/vmenter.S +++ b/arch/x86/kvm/svm/vmenter.S @@ -99,6 +99,7 @@ */ SYM_FUNC_START(__svm_vcpu_run) push %_ASM_BP + mov %_ASM_SP, %_ASM_BP #ifdef CONFIG_X86_64 push %r15 push %r14 -- 2.44.0.rc0.258.g7320e95886-goog
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