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KVM: SVM: Clobber RAX instead of RBX when discarding spec_ctrl_intercepted

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POP @spec_ctrl_intercepted into RAX instead of RBX when discarding it from
the stack so that __svm_sev_es_vcpu_run() doesn't modify any non-volatile
registers.  __svm_sev_es_vcpu_run() doesn't return a value, and RAX is
already are clobbered multiple times in the #VMEXIT path.

This will allowing using the host save area to save/restore non-volatile
registers in __svm_sev_es_vcpu_run().

Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20240223204233.3337324-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2024-02-23 12:42:29 -08:00
parent 331282fdb1
commit 87e8e360a0
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/svm/vmenter.S
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@@ -350,8 +350,8 @@ SYM_FUNC_START(__svm_sev_es_vcpu_run)
*/
UNTRAIN_RET_VM
/* "Pop" @spec_ctrl_intercepted. */
pop %rbx
/* "Pop" and discard @spec_ctrl_intercepted. */
pop %rax
pop %rbx