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mx.microsoft.com 1; spf=pass smtp.mailfrom=citrix.com; dmarc=pass action=none header.from=citrix.com; dkim=pass header.d=citrix.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.onmicrosoft.com; s=selector2-citrix-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=kMM+/x5/EdEJOyjUC+X75zlJ9+hyk+7CvKHWojtzWqE=; b=paDeWY4AZGOW2Cjiv41KVoVW65DNW12tNtIi5zk7gT3LRn20UdInrgUTetMdvvY+n4aAQcxY8z47y628VZ5mEZzFP3hLjrVhHUI0ZVmfzi5tjlx0JaLCoAyh8767vhqI6TmoO59BzqxUWMksKOggTMme9ocehG4/X7qTVkD6Vzc= From: Roger Pau Monne To: CC: Roger Pau Monne , Jan Beulich , Andrew Cooper , Wei Liu Subject: [PATCH] x86/msr: don't inject #GP when trying to read FEATURE_CONTROL Date: Fri, 27 Nov 2020 11:46:14 +0100 Message-ID: <20201127104614.71933-1-roger.pau@citrix.com> X-Mailer: git-send-email 2.29.2 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MR2P264CA0076.FRAP264.PROD.OUTLOOK.COM (2603:10a6:500:32::16) To DS7PR03MB5608.namprd03.prod.outlook.com (2603:10b6:5:2c9::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8d5dd280-f377-4b21-2bdf-08d892c1b926 X-MS-TrafficTypeDiagnostic: DM6PR03MB5084: X-LD-Processed: 335836de-42ef-43a2-b145-348c2ee9ca5b,ExtAddr X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2803; 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Fix this by injecting a #GP only when the vendor doesn't support the MSR, even if there are no features to expose. Fixes: 39ab598c50a2 ('x86/pv: allow reading FEATURE_CONTROL MSR') Signed-off-by: Roger Pau Monn=C3=A9 Acked-by: Jan Beulich --- xen/arch/x86/msr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/x86/msr.c b/xen/arch/x86/msr.c index be8e363862..38b0a046e1 100644 --- a/xen/arch/x86/msr.c +++ b/xen/arch/x86/msr.c @@ -176,7 +176,7 @@ int guest_rdmsr(struct vcpu *v, uint32_t msr, uint64_t = *val) switch ( msr ) { case MSR_IA32_FEATURE_CONTROL: - if ( !cp->basic.vmx && !vmce_has_lmce(v) ) + if ( !(cp->x86_vendor & (X86_VENDOR_INTEL | X86_VENDOR_CENTAUR)) ) goto gp_fault; =20 *val =3D IA32_FEATURE_CONTROL_LOCK; --=20 2.29.2