From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5D2DD34BA41 for ; Wed, 1 Oct 2025 00:15:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759277739; cv=none; b=CZ/TbOc3sXhc7fBdngxz9SGB3rZO5x99X4qocDMkXUm7epq86AM8zVF7zWbR9j06aBbicVg8efkoq9UKhMHsDpHFLFh54ritLmQr8pnQaeSLbQ9kzLFORxp6K48HPKSQTtes/HCq7YipgIKLGydWonY1JYmXFUL62IHGpUWKJLA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759277739; c=relaxed/simple; bh=57ATFxwrfP34L60ND1WRUscmu4NIVxMjEqJtozG1WMw=; h=Date:Mime-Version:Message-ID:Subject:From:To:Content-Type; b=LhCU97up+fyuKBMpNfdna4xjCDpRRsdelDc42GuLITbtyjd4Y43FxDb6PHVlYyLzQsvNnOwS3/wXUiGgwFddjEpQ8jdSjenSYR4ow1XPiGZyxkuIEoP+4GviH2yjN7MII6gcx5q6FDydGJHfmSwUChlMFOmU0qKK5S9cODPVsok= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--jmattson.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=zSSH/3Ey; arc=none smtp.client-ip=209.85.216.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--jmattson.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="zSSH/3Ey" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-32ee4998c50so5761654a91.3 for ; Tue, 30 Sep 2025 17:15:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1759277738; x=1759882538; darn=vger.kernel.org; h=to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=1F9lIm+hwQ6zpx2Vlmkddr8zKECCqP++90rM5GEbtyc=; b=zSSH/3EyG9j8gZ8tmBoJnna0TfKfTOonVORLkjnu/ZLN31siMd1SuNq+TxGtscfVPI jvxa/UTaLvTKzYB2hyKPOKXrnzqwWEbcRRzJ54j4sJyZZJ9F58pnMCs8pphbczRDGqZC bMsGmVuFOsxQAJ9tbHRH18PFpIaOfjwcXE7cIfNXSkBAyvVhc6sFZrdYE1Td7XcBLIaA jM8nDIzsRz41U7ipg+DSUxNNmHkcaR+KivI8xkMiRF2RDJuuzQ/QUr6+Zro2w7cP5wyK Un83K8Nj432t43GgYneZlvvbddNRulfgp+HIoETjz0VmGb8hvUu6EzeR4H5P8CRTSZFl JEag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759277738; x=1759882538; h=to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=1F9lIm+hwQ6zpx2Vlmkddr8zKECCqP++90rM5GEbtyc=; b=EWr/NBRUKMkf0pomQLcUlmvHCsYJAz3oGu1gJwKCk+QNxJc8Q1Sw9o83BvkzvPsq+Z SkHS4f3VU4gb3gvGLhnaKcvRd4wBJZYDWdHIXPsiIeQ7xiHb85tZknwuMdABznqOg39x weFm2ZkTTInt2m8k2nBo5nKm0p54reRNBQtDk++UzGjHHiUcow7Ong83LTLNCwuBL++M LTZL8q9aJaLEfMuj+z03IkBG/BDT3KQG7b1oyRyNLZky8bAWRLq1ETur2L6wpxx3MEI9 S3F7Ev/mzXEyn505jjgjJrrjcHbU7hzlAVrGVbFJ8eDPcX0TRXATvSPq5EdwZLbhbAl7 kt+Q== X-Forwarded-Encrypted: i=1; AJvYcCUXpJIygRsepriPX5kCVbsuVfMzhzn7Jrvv0Dv5eg1pIsmBPbAPsNuhvhdEah69dE0aze5ABct2+nYm6jk=@vger.kernel.org X-Gm-Message-State: AOJu0YxHojNun81P7GGk0VjCeAdwS5tKjKCIitCfVr/t1/NT2ApksQ04 4OQIbqyx6ahbe6bwDXeo2i9lzE6xhRTNuCLaL3/J/wOIIlSRFSto1/XL0S8j16KBrbtsUzyeloM L/rQbFZUBx+tN6g== X-Google-Smtp-Source: AGHT+IECzWXOw0pUSih1P+e508jmxKpaoxcwlzPpzcDrcMMQ+GZI0/YtT8hTGY1ft4mjHEKFiZ77bZmnYHd1nw== X-Received: from pjbqe12.prod.google.com ([2002:a17:90b:4f8c:b0:32e:b87b:6c84]) (user=jmattson job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:1d0d:b0:336:9e78:c4c1 with SMTP id 98e67ed59e1d1-339a6e9d285mr1419873a91.15.1759277737673; Tue, 30 Sep 2025 17:15:37 -0700 (PDT) Date: Tue, 30 Sep 2025 17:14:06 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.51.0.618.g983fd99d29-goog Message-ID: <20251001001529.1119031-1-jmattson@google.com> Subject: [PATCH v2 0/2] KVM: SVM: Handle EferLmsleUnsupported From: Jim Mattson To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Sean Christopherson , Paolo Bonzini , Pawan Gupta , Tom Lendacky , Jim Mattson , Perry Yuan , Sohil Mehta , "Xin Li (Intel)" , Joerg Roedel , Avi Kivity , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Yosry Ahmed Content-Type: text/plain; charset="UTF-8" It is no longer the case that EFER.LMSLE is supported by all SVM-capable processors. AMD enumerates the absence of this feature by CPUID Fn8000_0008_EBX[EferLmlseUnsupported](bit 20)=1. Advertise this defeature bit to userspace via KVM_GET_SUPPORTED_CPUID, and don't allow a guest to set EFER.LMSLE on hardware that doesn't support the feature. Jim Mattson (2): KVM: x86: Advertise EferLmsleUnsupported to userspace KVM: SVM: Disallow EFER.LMSLE when not supported by hardware arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/kvm/cpuid.c | 1 + arch/x86/kvm/svm/svm.c | 4 +++- 3 files changed, 5 insertions(+), 1 deletion(-) -- 2.51.0.618.g983fd99d29-goog