From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (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 C5ECC450915 for ; Wed, 27 May 2026 17:44:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779903845; cv=none; b=PR3/50metZiX7UGKUsHqUO5uZaUJ1dj/t4nYwB7G5yZuv4Tox4bAhwSDmPA1/ipuwnxoV6gvsEF3kKjqM9uU5zSVDYrxgq25dmzmrCRX/3berGg/C+DqUWO+rD+1rz3qtNtmlAlUJjjzTyg6ktepdXUtTo/hP0BL4DCq0om0Co8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779903845; c=relaxed/simple; bh=jpmgNIdJkprLJymLsq3oZ+rMXRm7TzPF16ImzVaxq3w=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=hfFKXegyEAUYH41qeMRUY1uJf3GVXx7XzTEoLoCtixCdHMX5vdsVKe+w7FbL8sDqjP1RF4Y1Nj08x8g+DwCjgj5CBnyl47RRwBjPIY/NjcV1SdhRyKqaf62uAFFWh+LKSg2rOeQipUh2Q3+zGUFxO0Tx77IaTI1WnFG8sLq64PE= 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=iNixskB8; arc=none smtp.client-ip=209.85.215.202 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="iNixskB8" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-c8525f0807aso7147633a12.3 for ; Wed, 27 May 2026 10:44:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1779903842; x=1780508642; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=oig6AEstrs1nnDsGojI66cnVWbXifAj5Zj7sL3iLLWc=; b=iNixskB8fuwf7O5f7msomm9XD/u8g5Eakz39ZM7eEnvSJHAsVD+Vb5uq4/UZz0lV2B BKEc48HHnUBw4dlBoMRUjR9xgEk3Q/uv7KPlXLgLMJ4l4pQwQwGk6ESADMDZit2f4nuQ 7M96M/UG065okr7JK/TmAeUsJRIVBEsr/P5j1NbcjxzHM+obfd3NM1w06LhshuKJV0e1 jRUPVFqx00M8ul74TDIvDPFxgv1jz+CsEvHK4oMgqV42ra4G+ctJQzFd6knoL5o2P6s0 UaJkdeSKW0xALjAMuWP6cclJTuHCVANFl/lpFkK1072UvJktL4lDiLPfe5Vc1yAcMmN6 WiTA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779903842; x=1780508642; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=oig6AEstrs1nnDsGojI66cnVWbXifAj5Zj7sL3iLLWc=; b=SsCplbuMxb+28mMYzZdTCj/b1UkJgfGqvF3WHh2T0Ch5kvIIFGAZFU/Awv6glcQqYi rseEVaCSinaqjMnw1TDtx4/SiO8MqHzaR74F9mJo304EULG9LYa0BzJN5FWT10lEUK8G CvpPdAa1y+e5RNazhpSVZZwRYmCCvFOK8fSssSuWFPpk9CnIzgH9pPFYsoJToNjWiWKD seVG54gXdOCdYSY0ZBnA6RVceM0BmYcZ0Fi50K+0vRa3cr18y/zdkflzQzVkzbOpC8Bf IPzv3HPekNsomMCg3PNITlWUDwsvyHUoQifJGzW3HUPpEv3PUxtGl7Y2p0htNGczkvSq Ryag== X-Forwarded-Encrypted: i=1; AFNElJ/LAYFZDk2hlhYrbvO0Sq9XyROf4vH0yRw6gWy4RaiRtSauTTZmfZpokRL8m2Yn9r7BYz5wRcB/jQfgLA0=@vger.kernel.org X-Gm-Message-State: AOJu0YwmjjWh41qyz18mtHvi9M1dcSzPY9vI0ik3lXP+nbbqgSKXxPQt 6B5ialDq9ea48Xh822UCcqgO9Drelqyah7l91FQE9hmNTNDA0GZyzfNCVYjybzOrIdPypwz7bML tbriCvNWSOOQ+0w== X-Received: from pfbcz7.prod.google.com ([2002:aa7:9307:0:b0:835:687a:d19d]) (user=jmattson job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:a06:b0:3b2:8685:1473 with SMTP id adf61e73a8af0-3b328c4cbc5mr25140090637.7.1779903841608; Wed, 27 May 2026 10:44:01 -0700 (PDT) Date: Wed, 27 May 2026 10:43:42 -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 2.54.0.794.g4f17f83d09-goog Message-ID: <20260527174347.2356165-1-jmattson@google.com> Subject: [PATCH v4 0/5] KVM: x86: Virtualize AMD's "disable CPUID in usermode" From: Jim Mattson To: seanjc@google.com, 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 Cc: Jim Mattson Content-Type: text/plain; charset="UTF-8" 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. v3 -> v4: * Fix typo in commit message for patch 1 [Binbin] * Fix #GP/CPUID VM-exit precedence in nested VMX [Sashiko] * Add EXPORT_STATIC_CALL_GPL(kvm_x86_get_cpl) v1: https://lore.kernel.org/kvm/20260402223108.650572-1-jmattson@google.com/ v2: https://lore.kernel.org/kvm/20260508170714.489136-1-jmattson@google.com/ v3: https://lore.kernel.org/kvm/20260513224608.1859737-1-jmattson@google.com/ Jim Mattson (4): KVM: x86: Prioritize CPUID faulting over CPUID VM-exits in nested VMX KVM: x86: Remove supports_cpuid_fault() helper KVM: x86: Virtualize AMD CPUID faulting KVM: selftests: Update hwcr_msr_test for CPUID faulting bit Sean Christopherson (1): KVM: x86: Consolidate CPUID fault handling for emulator and interception logic arch/x86/include/asm/kvm_host.h | 1 - arch/x86/include/asm/msr-index.h | 1 + arch/x86/kvm/cpuid.c | 7 ++-- arch/x86/kvm/cpuid.h | 14 ++++--- arch/x86/kvm/emulate.c | 6 +-- arch/x86/kvm/kvm_emulate.h | 1 + arch/x86/kvm/vmx/nested.c | 2 + arch/x86/kvm/x86.c | 39 ++++++++++--------- .../selftests/kvm/include/x86/processor.h | 1 + .../testing/selftests/kvm/x86/hwcr_msr_test.c | 9 ++++- 10 files changed, 46 insertions(+), 35 deletions(-) -- 2.54.0.794.g4f17f83d09-goog