From nobody Mon Feb 9 05:59:37 2026 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (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 B4AE01D043C for ; Thu, 28 Nov 2024 01:36:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732757772; cv=none; b=AySkL3PVHxRvKsILkUbPXfsJ9xpRWrki+Eh6ZKlrU+S0vs41/T+aY5aa45dYXVlzOkUAboo3iMJgPB62g+qXGmnGkphqb4mRuPCcri0PWbtyK2kq+QythRNHk0gHJIsbIITyqW6+3Sj1+6hd8GC9w+tKRRdzz4SAupfUezWRbTg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732757772; c=relaxed/simple; bh=irc8Le9t/2+80quqPskqjkEtE694oI45PecCpS74YBg=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=O79zdjD3MGJkhyJtEBOKqKbK+t4X9IOjdosdDFtWbQFu1cPGDgucfMH1X2FIoC+/wO8z2olNyUrZcCKdTq355hZz6YAxTUcsgJohOnDVc2xnIuUb6ZdGd5/vStJkmZWvYIPJXkug0LDFlKKbxZj5LGbDpKDj2S0Z9obH5skPNaw= 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=OIEvQn00; arc=none smtp.client-ip=209.85.214.202 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--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="OIEvQn00" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-212099b3f01so3172925ad.2 for ; Wed, 27 Nov 2024 17:36:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1732757770; x=1733362570; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=xiLgVENbF37xEr+aKdmhYet7DBz2tD95xIx77Ae2lio=; b=OIEvQn00827iLEQXgcIwh8NmxjnyWphh1J+qc7OFDnloylrYHz0nxSmg/UMCvwqh+g 8PIEmmp4gGiGHKNnbYeClBhxIQxyA4TXedJNJLQDUI3VbKCZG+7QqAenG19ZS4oEzzRw bIaAZCaF8IGCfhPX6QnX9wjLuGtF7lYXabM/qbRT1B6x56aNK038btG1T5N0clSprLRy 7W3JZ/f/sFK/u4XHQl0n/rEb2vG406uls/jN7VwbPzlmPNUynVoFqSpSHjWtj50TUDIh eRtpPDKUnMU8MpZ/QPVhVoeOAD66ykvi3/OnhTcEqezt+nl2L4AvHU4LBaneR6a+SSLq pAoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732757770; x=1733362570; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=xiLgVENbF37xEr+aKdmhYet7DBz2tD95xIx77Ae2lio=; b=oSXDr95yhDdE4WWD6CfHYJ9vjknV7FQiHKJKE8KsKWrpOmtuaJMWiDn8WlxAjstJCL DjB2lC7kYSkiI19qS4WpdSutaCyPHWhgMRr4VeydbOdVpx7Blxl4Xd7PQzpy3ZGsdn5d uc8CMERpGu/EVFRtVw65Ktv+nozmpYqXcKDcMLc52Sf2fbZf1qH1yGMP0Xm/oSbrCEtW pJnj7ZTi2ft48PWVPzM7l2lC8zqaVp88Vmz3KvQ7trzkUwkuSwf4jV3tsQUVExGZH9Dx 72o/hafmtgQcZWubDwinNsbX4LJTjqW2hAEbvepR/kjteVPLjUNU2CyfXzoveXGwWUKh 9xHQ== X-Forwarded-Encrypted: i=1; AJvYcCWHWcBpsMV53XYpWK8OVqTrWpGI/wsVJf/+3wfkjswwHLJRWsnW2/TCk8VN0XDo1JL9x0HkgV9nVwug1Vs=@vger.kernel.org X-Gm-Message-State: AOJu0Yyz/aiglJDqiVZpFG+YbDIq3l6RtlYyFD+idfeIaNSAD00zxaS6 gERMbPBiFQiL4Uqa6kNPn8xlkCV1qNgRYgSNuQKDLoKJtweWYpITyvOhPBRsfeJHC3fqVC6cVBt mNw== X-Google-Smtp-Source: AGHT+IEoKJQaztiJQlzcINhEIAOdgtyjmMRnP8Lc1kKByNnQDVZuqJkARQENGVuqU8UB1VFBKIBP49R5j7M= X-Received: from plrj13.prod.google.com ([2002:a17:903:28d:b0:212:3bf9:5eb6]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:f705:b0:212:4c71:fef1 with SMTP id d9443c01a7336-21501f77c44mr68213195ad.56.1732757770039; Wed, 27 Nov 2024 17:36:10 -0800 (PST) Reply-To: Sean Christopherson Date: Wed, 27 Nov 2024 17:34:23 -0800 In-Reply-To: <20241128013424.4096668-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241128013424.4096668-1-seanjc@google.com> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog Message-ID: <20241128013424.4096668-57-seanjc@google.com> Subject: [PATCH v3 56/57] KVM: x86: Explicitly track feature flags that are enabled at runtime From: Sean Christopherson To: Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Jarkko Sakkinen Cc: kvm@vger.kernel.org, linux-sgx@vger.kernel.org, linux-kernel@vger.kernel.org, Maxim Levitsky , Hou Wenlong , Xiaoyao Li , Kechen Lu , Oliver Upton , Binbin Wu , Yang Weijiang , Robert Hoo Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add one last (hopefully) CPUID feature macro, RUNTIME_F(), and use it to track features that KVM supports, but that are only set at runtime (in response to other state), and aren't advertised to userspace via KVM_GET_SUPPORTED_CPUID. Currently, RUNTIME_F() is mostly just documentation, but tracking all KVM-supported features will allow for asserting, at build time, take), that all features that are set, cleared, *or* checked by KVM are known to kvm_set_cpu_caps(). No functional change intended. Signed-off-by: Sean Christopherson --- arch/x86/kvm/cpuid.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 5ac5fe2febf7..e03154b9833f 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -768,6 +768,16 @@ do { \ 0; \ }) =20 +/* + * Runtime Features - For features that KVM dynamically sets/clears at run= time, + * e.g. when CR4 changes, but which are never advertised to userspace. + */ +#define RUNTIME_F(name) \ +({ \ + KVM_VALIDATE_CPU_CAP_USAGE(name); \ + 0; \ +}) + /* * Undefine the MSR bit macro to avoid token concatenation issues when * processing X86_FEATURE_SPEC_CTRL_SSBD. @@ -790,9 +800,11 @@ void kvm_set_cpu_caps(void) VENDOR_F(DTES64) | /* * NOTE: MONITOR (and MWAIT) are emulated as NOP, but *not* - * advertised to guests via CPUID! + * advertised to guests via CPUID! MWAIT is also technically a + * runtime flag thanks to IA32_MISC_ENABLES; mark it as such so + * that KVM is aware that it's a known, unadvertised flag. */ - 0 /* MONITOR */ | + RUNTIME_F(MWAIT) | VENDOR_F(VMX) | 0 /* DS-CPL, SMX, EST */ | 0 /* TM2 */ | @@ -813,7 +825,7 @@ void kvm_set_cpu_caps(void) EMULATED_F(TSC_DEADLINE_TIMER) | F(AES) | F(XSAVE) | - 0 /* OSXSAVE */ | + RUNTIME_F(OSXSAVE) | F(AVX) | F(F16C) | F(RDRAND) | @@ -887,7 +899,7 @@ void kvm_set_cpu_caps(void) F(AVX512VBMI) | PASSTHROUGH_F(LA57) | F(PKU) | - 0 /*OSPKE*/ | + RUNTIME_F(OSPKE) | F(RDPID) | F(AVX512_VPOPCNTDQ) | F(UMIP) | @@ -1189,6 +1201,7 @@ EXPORT_SYMBOL_GPL(kvm_set_cpu_caps); #undef PASSTHROUGH_F #undef ALIASED_1_EDX_F #undef VENDOR_F +#undef RUNTIME_F =20 struct kvm_cpuid_array { struct kvm_cpuid_entry2 *entries; --=20 2.47.0.338.g60cca15819-goog