linux-kernel - [PATCH 09/28] KVM: nSVM: Omit SEV-ES specific passthrough MSRs from L0+L1 bitmap merge

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Message-ID: <20250529234013.3826933-10-seanjc@google.com>
Date: Thu, 29 May 2025 16:39:54 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Borislav Petkov <bp@...en8.de>, Xin Li <xin@...or.com>, Chao Gao <chao.gao@...el.com>, 
	Dapeng Mi <dapeng1.mi@...ux.intel.com>
Subject: [PATCH 09/28] KVM: nSVM: Omit SEV-ES specific passthrough MSRs from
 L0+L1 bitmap merge

Don't merge bitmaps on nested VMRUN for MSRs that KVM passes through only
for SEV-ES guests.  KVM doesn't support nested virtualization for SEV-ES,
and likely never will.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/nested.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index e53020939e60..e4a079ea4b27 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -184,7 +184,7 @@ void recalc_intercepts(struct vcpu_svm *svm)
 	}
 }
 
-static int nested_svm_msrpm_merge_offsets[9] __ro_after_init;
+static int nested_svm_msrpm_merge_offsets[6] __ro_after_init;
 static int nested_svm_nr_msrpm_merge_offsets __ro_after_init;
 
 int __init nested_svm_init_msrpm_merge_offsets(void)
@@ -209,12 +209,6 @@ int __init nested_svm_init_msrpm_merge_offsets(void)
 		MSR_IA32_LASTBRANCHTOIP,
 		MSR_IA32_LASTINTFROMIP,
 		MSR_IA32_LASTINTTOIP,
-
-		MSR_IA32_XSS,
-		MSR_EFER,
-		MSR_IA32_CR_PAT,
-		MSR_AMD64_SEV_ES_GHCB,
-		MSR_TSC_AUX,
 	};
 	int i, j;
 
-- 
2.49.0.1204.g71687c7c1d-goog