From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (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 12438190462 for ; Fri, 29 May 2026 22:47:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780094876; cv=none; b=hLb9Q91fXMGV2AtcnVbhaagbyF5Z6KlCnXPBfsYTD8O543Wx+l3pqKfYWggu/D5GfyHGErZzkZ76QS40yshOEqWg+m6wB8oLSEA5GKOiUXMDXKyX+cr4yLYfxYrfECh1MvkXu7ELx4Au517ZnYdv92xjK9ccdJ9Cw1E533T3wXc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780094876; c=relaxed/simple; bh=EhXkRw0+3FPNY3jkfcQ8Ugbl3bFu9YVeGT9yETM4UQ8=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Content-Type; b=JU+F5M+s0MWsBzzFwx0v71Ztd6ywp1tLhTSF5FnN+g+hJZT5zmA2lFsjnWcAygEW3d5o6LOcn/Hv0iZhdipFQCE+LhBYTJRxMlFhnX7hpfBtL54rmeZtrhu4Hcmx+UC0LsgZSSnTDaxw6/CeUcFAfC49QlU3d6gSZpXJiJrvz0s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=M4zk/1hm; arc=none smtp.client-ip=209.85.214.201 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--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="M4zk/1hm" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-2bd04e4fe3dso118591385ad.3 for ; Fri, 29 May 2026 15:47:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1780094874; x=1780699674; darn=vger.kernel.org; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=LBoaHKw1uhDp/VWR8jKcQP5YxjdLIxlGKMU+QUhdwms=; b=M4zk/1hm5PyXjrNnQd3SMH+0YaUzqWqUJkYbC3zEt45FDiTmne9Kp6/88OKj3dk4uw Tjpi34spAUvSnkd0bMD2Ujv0S1Xk61gQU5jD7ixDfHe0H/izgIRgo5L/YdpglXu2rsnP +JmQNCr6stxIM0Tez9l0muPPXL2M1MxmPyc3/s6MdEzw5czRQSj3nWRumMOnW11z4Xqo mT1NRA9ATUH5jVWogfG6K4sBuE/aomh6/+Ozhg5APszHcpkWPZIdlObVmd+GLN4Sds+3 osE2eJ9tNSz2seg457UrOuyVcP/om6FifHyPhdM9jTofHn27soqDHKtiCYSvQUrS+B8w nHDg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780094874; x=1780699674; h=to:from:subject:message-id:references:mime-version:in-reply-to:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=LBoaHKw1uhDp/VWR8jKcQP5YxjdLIxlGKMU+QUhdwms=; b=YxSEyyvVc12aeuUY5/rU4ani8V4eiYHCKWakuDWfa0O4o3sczNNeyvugKq+ULblXEN SmcqooWnf0oTiC8AoS75/VdFI2xHsGzl2/yfnHJMEhdNvOmmdC9/IFhMDVzllJgMWkra oj2LGLE8TfxykDuXPXlxZxM68CcdRfY6nHczv66E/YcizEFUfjDJyYwy7X8UsvdDqlNE 4HeL2VwMbdBi0kY5QIRK1kumjs2nNDsygu/9ztwEssaTk/+WBFaAonFcV/vqa1Rcr6/3 gdqJVsiyIfywkt6oRJ713SnOKq9RuWDaXNtpAWBPMYaMxia75gIi2BZ9bRUxCG58x3n7 J8Uw== X-Forwarded-Encrypted: i=1; AFNElJ8fmyyU5nX/WforX+5jOtXHRUkOL+NUS0+JFxkSqsL1ZTDbwFVj71R6vPDMNK8K35tx0MK1vUL0gMhkcuk=@vger.kernel.org X-Gm-Message-State: AOJu0YzflR2klUskuRqLt/Un4SRr0fImarBBBIKeE91U8pC4RThjCyOV /3+gkTkNc2LuH+cC7SK9mNuFcuSqAJJ69uVnF7iaCRcs7BWm4xsoN6zeVXdcqAWQWt/tNIASytC +5Aqjvg== X-Received: from pgbcr12.prod.google.com ([2002:a05:6a02:410c:b0:c85:812d:cbfd]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:8ccb:b0:38b:eadd:449a with SMTP id adf61e73a8af0-3b428242975mr1406350637.38.1780094874162; Fri, 29 May 2026 15:47:54 -0700 (PDT) Date: Fri, 29 May 2026 15:47:46 -0700 In-Reply-To: <20260527174347.2356165-1-jmattson@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260527174347.2356165-1-jmattson@google.com> X-Mailer: git-send-email 2.54.0.823.g6e5bcc1fc9-goog Message-ID: <178009472318.880870.7878635650921105255.b4-ty@google.com> Subject: Re: [PATCH v4 0/5] KVM: x86: Virtualize AMD's "disable CPUID in usermode" From: Sean Christopherson To: Sean Christopherson , pbonzini@redhat.com, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, shuah@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, ctpence@google.com, David.Kaplan@amd.com, binbin.wu@linux.intel.com, Jim Mattson Content-Type: text/plain; charset="utf-8" On Wed, 27 May 2026 10:43:42 -0700, Jim Mattson wrote: > AMD's "disable CPUID in usermode" feature is analogous to Intel's "CPUID > faulting" feature, but it is advertised and activated differently. The AMD > feature is advertised via CPUID.80000021H:EAX.CpuidUserDis[bit 17] and > activated by setting HWCR.CpuidUserDis[bit 35]. > > Add virtualization support for the AMD feature. > > [...] Applied to kvm-x86 misc, thanks! [1/5] KVM: x86: Consolidate CPUID fault handling for emulator and interception logic https://github.com/kvm-x86/linux/commit/cf7d65d1d6f5 [2/5] KVM: x86: Prioritize CPUID faulting over CPUID VM-exits in nested VMX https://github.com/kvm-x86/linux/commit/be7fd7c3e8bc [3/5] KVM: x86: Remove supports_cpuid_fault() helper https://github.com/kvm-x86/linux/commit/d1bc99885a59 [4/5] KVM: x86: Virtualize AMD CPUID faulting https://github.com/kvm-x86/linux/commit/e93a93f11490 [5/5] KVM: selftests: Update hwcr_msr_test for CPUID faulting bit https://github.com/kvm-x86/linux/commit/b16c2aca369d -- https://github.com/kvm-x86/linux/tree/next