Re: [PATCH v3 2/3] KVM: SEV-ES: Disallow SEV-ES guests when X86_FEATURE_LBRV is absent

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On 5/23/24 14:18, Ravi Bangoria wrote:
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 489b0183f37d..dcb5eb00a4f5 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -5308,11 +5308,17 @@ static __init int svm_hardware_setup(void)
nrips = nrips && boot_cpu_has(X86_FEATURE_NRIPS); + if (lbrv) {
+		if (!boot_cpu_has(X86_FEATURE_LBRV))
+			lbrv = false;
+		else
+			pr_info("LBR virtualization supported\n");
+	}
  	/*
  	 * Note, SEV setup consumes npt_enabled and enable_mmio_caching (which
  	 * may be modified by svm_adjust_mmio_mask()), as well as nrips.
  	 */

Since it consumes nrips, just make lbrv non-static:

/* enable/disable Next RIP Save */
int nrips = true;
module_param(nrips, int, 0444);

Paolo





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