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KVM: SVM: Clobber RAX instead of RBX when discarding spec_ctrl_interc…
…epted 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>
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