From nobody Mon Feb 9 07:19:25 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6BCE7EB64DA for ; Wed, 12 Jul 2023 18:32:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233065AbjGLScG (ORCPT ); Wed, 12 Jul 2023 14:32:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40320 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232948AbjGLSb4 (ORCPT ); Wed, 12 Jul 2023 14:31:56 -0400 Received: from smtp-fw-52004.amazon.com (smtp-fw-52004.amazon.com [52.119.213.154]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05827DC; Wed, 12 Jul 2023 11:31:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1689186715; x=1720722715; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=NUM+SsTWU9wvHoPzLXfvOsVyQM5ZYPYAOL7pyHpyzkM=; b=NqvxwxwUkq6h6SY59/00ZVcvTXfK0G6ZUHrVhoTaClKEWhWtmjO0hrNj eVX8lmFhSzzl0urPd+frxxxUxlQXiJiA1iz/85fE/eQaZwuidJ1pOp4w2 HLWZZxcPTFbK2uTy6jV8ly7qnoYWo287Am+PGV5Y2dg6t3XEm8BKEM4VS c=; X-IronPort-AV: E=Sophos;i="6.01,200,1684800000"; d="scan'208";a="142361311" Received: from iad12-co-svc-p1-lb1-vlan2.amazon.com (HELO email-inbound-relay-iad-1a-m6i4x-bbc6e425.us-east-1.amazon.com) ([10.43.8.2]) by smtp-border-fw-52004.iad7.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jul 2023 18:31:53 +0000 Received: from EX19MTAUWB001.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan3.iad.amazon.com [10.40.163.38]) by email-inbound-relay-iad-1a-m6i4x-bbc6e425.us-east-1.amazon.com (Postfix) with ESMTPS id 423CB806BF; Wed, 12 Jul 2023 18:31:52 +0000 (UTC) Received: from EX19D002ANA003.ant.amazon.com (10.37.240.141) by EX19MTAUWB001.ant.amazon.com (10.250.64.248) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Wed, 12 Jul 2023 18:31:51 +0000 Received: from b0f1d8753182.ant.amazon.com (10.106.83.21) by EX19D002ANA003.ant.amazon.com (10.37.240.141) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.30; Wed, 12 Jul 2023 18:31:47 +0000 From: Takahiro Itazuri To: Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , , "H . Peter Anvin" , , CC: Takahiro Itazuri , Takahiro Itazuri Subject: [PATCH] KVM: pass through CPUID 0x80000005 Date: Wed, 12 Jul 2023 19:31:36 +0100 Message-ID: <20230712183136.85561-1-itazur@amazon.com> X-Mailer: git-send-email 2.38.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.106.83.21] X-ClientProxiedBy: EX19D033UWA002.ant.amazon.com (10.13.139.10) To EX19D002ANA003.ant.amazon.com (10.37.240.141) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Pass CPUID 0x80000005 (L1 cache and TLB info). CPUID 0x80000006 (L2 cache and TLB and L3 cache info) has been returned since commit 43d05de2bee7 ("KVM: pass through CPUID(0x80000006)"). Enumerating both 0x80000005 and 0x80000006 with KVM_GET_SUPPORTED_CPUID would be better than reporting either, and 0x80000005 could be helpful for VMM to pass it to KVM_SET_CPUID{,2} for the same reason with 0x80000006.. Signed-off-by: Takahiro Itazuri --- Discussion was made a bit on https://lore.kernel.org/all/20230712170258.75355-1-itazur@amazon.com/. If there is any reason that leaf 0x80000005 should not be enumerated or dropping leaf 0x80000006 is preferred, please feel free to share your thoughts. --- arch/x86/kvm/cpuid.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 0c9660a07b23..54a5b256c484 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -1152,6 +1152,9 @@ static inline int __do_cpuid_func(struct kvm_cpuid_ar= ray *array, u32 function) cpuid_entry_override(entry, CPUID_8000_0001_EDX); cpuid_entry_override(entry, CPUID_8000_0001_ECX); break; + case 0x80000005: + /* Pass host L1 cache and TLB info. */ + break; case 0x80000006: /* Drop reserved bits, pass host L2 cache and TLB info. */ entry->edx &=3D ~GENMASK(17, 16); --=20 2.38.0