linux-kernel - [PATCH v2 11/32] KVM: nSVM: Omit SEV-ES specific passthrough MSRs from L0+L1 bitmap merge

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250610225737.156318-12-seanjc@google.com>
Date: Tue, 10 Jun 2025 15:57:16 -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, 
	Chao Gao <chao.gao@...el.com>, Borislav Petkov <bp@...en8.de>, Xin Li <xin@...or.com>, 
	Dapeng Mi <dapeng1.mi@...ux.intel.com>, Francesco Lavra <francescolavra.fl@...il.com>, 
	Manali Shukla <Manali.Shukla@....com>
Subject: [PATCH v2 11/32] 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 | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 666469e11602..360dbd80a728 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -194,7 +194,7 @@ void recalc_intercepts(struct vcpu_svm *svm)
  * Hardcode the capacity of the array based on the maximum number of _offsets_.
  * MSRs are batched together, so there are fewer offsets than MSRs.
  */
-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)
@@ -219,13 +219,6 @@ int __init nested_svm_init_msrpm_merge_offsets(void)
 		MSR_IA32_LASTBRANCHTOIP,
 		MSR_IA32_LASTINTFROMIP,
 		MSR_IA32_LASTINTTOIP,
-
-		MSR_IA32_DEBUGCTLMSR,
-		MSR_IA32_XSS,
-		MSR_EFER,
-		MSR_IA32_CR_PAT,
-		MSR_AMD64_SEV_ES_GHCB,
-		MSR_TSC_AUX,
 	};
 	int i, j;
 
-- 
2.50.0.rc0.642.g800a2b2222-goog