Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Jon Kohler <jon@nutanix.com>
To:     Andy Lutomirski <luto@kernel.org>
CC:     Dave Hansen <dave.hansen@intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Jon Kohler <jon@nutanix.com>, Babu Moger <babu.moger@amd.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        X86 ML <x86@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <seanjc@google.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>,
        Yu-cheng Yu <yu-cheng.yu@intel.com>,
        Fenghua Yu <fenghua.yu@intel.com>,
        Tony Luck <tony.luck@intel.com>,
        Uros Bizjak <ubizjak@gmail.com>,
        Petteri Aimonen <jpa@git.mail.kapsi.fi>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Kan Liang <kan.liang@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mike Rapoport <rppt@kernel.org>,
        Fan Yang <Fan_Yang@sjtu.edu.cn>,
        Juergen Gross <jgross@suse.com>,
        Benjamin Thiel <b.thiel@posteo.de>,
        Dave Jiang <dave.jiang@intel.com>,
        Ricardo Neri <ricardo.neri-calderon@linux.intel.com>,
        Arvind Sankar <nivedita@alum.mit.edu>,
        LKML <linux-kernel@vger.kernel.org>,
        "kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [PATCH v3] KVM: x86: use wrpkru directly in
 kvm_load_{guest|host}_xsave_state
Thread-Topic: [PATCH v3] KVM: x86: use wrpkru directly in
 kvm_load_{guest|host}_xsave_state
Thread-Index: AQHXRofYIalsAP9fFUG+2GLE3/0de6rfd04AgAC2M4CAAj21gIAEmLyA
Date:   Mon, 17 May 2021 02:58:25 +0000
Message-ID: <2FD095E7-5C74-4B58-953F-3195BA97ABEF@nutanix.com>
References: <20210511170508.40034-1-jon@nutanix.com>
 <YJuGms6UnRVpP7U/@hirez.programming.kicks-ass.net>
 <25d39a79-d8d8-9798-a930-ccdace304bac@intel.com>
 <1bde6f22-166b-8552-e7f3-5731508182ea@kernel.org>
In-Reply-To: <1bde6f22-166b-8552-e7f3-5731508182ea@kernel.org>
Accept-Language: en-US
Content-Language: en-US
x-ms-exchange-antispam-messagedata-chunkcount: 1
x-ms-exchange-antispam-messagedata-0: =?utf-8?B?OXBFL29mVmZVVFBQTWtHdXJaTmY2emV5ellrRzY4NWo2dFFCODN4OWtuYlJi?=
 =?utf-8?B?RWZVK1hvTzVqbWNZeW8zb1g1VTNtOTdPY0lPdTM3YS9yN0ozd3lUb3hadXFT?=
 =?utf-8?B?WmdMQ281NmRpRUliWXptcXVmOG1sT2hYYlhERnlOVkJkMTVGWHZ4L2VUWDRN?=
 =?utf-8?B?V2tGdkZNU0xzWUhubnhPQVo5ejQ4NGpORmZ5dkUyRXR3aXJqRFFCbGQ5SkZx?=
 =?utf-8?B?REEvY1hXUUx5RWZ0NVg0TUhKWkRKT3oreGRjbFgvNW5vV1pKQTJTbUJKU2x2?=
 =?utf-8?B?Z0tIVEszOThma0RHemN2ODBLSUIvdTBkZG4vSzdkM1BrWEFkKzgrVFlvaTd0?=
 =?utf-8?B?SndZcVRCc1lxaURNNHBUbURhZG41OEYzY3NERFFLYkk0bVhHYkZ6V0svZGhm?=
 =?utf-8?B?TG1mbGVjajdjRVE3Q2lUbGJPNGdqQ1I2MjRPRWVGTnBNYiszVlNiTC9SU2tm?=
 =?utf-8?B?N1lyQzFmSDJQMzNKVjlYSHFYeFA5UExLZUwyUlA3SkhVRnZoUDk4RWVFZStW?=
 =?utf-8?B?bDBJbldncTJYTEtaWnN4clpuVHRHckVmSzBTMDFpRjlPYlFnZVlZZjZNdXNq?=
 =?utf-8?B?QkNxL0xSbDJpZTNLWnpiR0JKaUgwNFc5L0d4Qlk5dFp1Q0EzVVZjeVJjWFQ2?=
 =?utf-8?B?QjJvUUxkQ2Y3eWUxMUsyY2hQdHYrUXBwN3ZreTRuMlNqbmZ3aTVmQUtOcGFq?=
 =?utf-8?B?WUE2N1BnY3FqbE9xZitSUGdDcnJockRPUDdXYjFXMXNkalpQY2ZyWUI2YXUx?=
 =?utf-8?B?bEpwQnBTVEtmYnFJT0liY1NBa0VBM3FaQXRyMXBoYmIwbEd4ZVpxbklUMFhB?=
 =?utf-8?B?R1ZmKy9rYVhOdVlkNTFrUXRTSHJXOW5ZQVJ0OUQxZ3dNTjFCc3Y5emEvU1Y4?=
 =?utf-8?B?T3oxNlJ5YWZBZE1neTV6Q3Q4ZnNaRE95T3h3VVZET0NLQ1JxazY0eDVVUFpi?=
 =?utf-8?B?ZWdWSXJIbGk2TGZETXkxQmJRMHQ0ZDZWbVV4TmQ3d1BZNkppc3gzT3ROVk5V?=
 =?utf-8?B?V0UySHpObVMrUjB2TE9ESTZqcnBiVFdVbHZ5QVRsVnVncWN2cmRQZk1iT052?=
 =?utf-8?B?Nnh6b1dFNk1Od0tHcGt5RTVKK3VKTUpNT0x5U3pwZ2tsZmpoQ2MrRUsyL0FJ?=
 =?utf-8?B?aDR0RXcrTHVWNnJxeUIyVGxncDNjbEJMZDF6YWFKb2I5azVMUXIzUmU0R2lh?=
 =?utf-8?B?RFp0RnVhNXgrUi96bzFSa244SXdJN2c4RlZacWVJRGZjTlkwZVZtcE5ZL2Js?=
 =?utf-8?B?RnFtQWJuZHM5ZjQrK1lweUtqMkJIclF4emJ0aWpLLzR0dzB6ekJYRTJYSHZM?=
 =?utf-8?B?aWVVV1VJUjJoenI0L09qbXRJalJLSFBNOU5UWm84L2M2K0UrT2RPMFQ1ajhF?=
 =?utf-8?B?dUhQckgrYVk1MWJoTFN6WmE5SDhXTHAraVNnMjRaVTVvTUtiYnRuQURFZUtY?=
 =?utf-8?B?eXdSNGZscWR1MXBXQysweU96S2k2dDIvbWZxbWRFUG1zMWZlZGtQc1U2bG4v?=
 =?utf-8?B?OXZvZlJwaWZPUjYvYUdDT2xzaVQ2SEdIb0oxK01IRVdEVzNIS2x3S3BMd3pC?=
 =?utf-8?B?MkZiSFBtYnphdzVlcTlJSzl3SDNma3JTNXJBS2tzUEVnbHZhMEV3bUtCbEhz?=
 =?utf-8?B?a1NnQ0x3TXZ5T2hZK0dZTnhhQ0pHOXpTcDBGQkxMVEQvSlF4Z1NmYmtjeDRF?=
 =?utf-8?B?QzZuYmVoODJRL0w3TGFObEYzT21EMzdBcXlxZ2NlMEFTWDF5bTNVRlNFaTJU?=
 =?utf-8?B?aE1ERnVlWlU1YUE1bkZjdWg4clMwM0hYZEx6ZG1vMU9aaytQUlVzT2RidjZB?=
 =?utf-8?B?SFhtMnBrU01hWG5pbExtSklJOHZ0RW5HNnh6NE1RTlpHdklqRUtrWlB4cnJ2?=
 =?utf-8?B?ZndnQit4RkFxMHo4bUdPaGE5TUtYSjBDRzhxQkVpKzFONlE9PQ==?=
Content-Type: text/plain; charset="utf-8"
Content-ID: <284FADD1F3926D449FE6FF6BA8AEE4F6@namprd02.prod.outlook.com>
Content-Transfer-Encoding: base64
MIME-Version: 1.0
X-OriginatorOrg: nutanix.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-AuthSource: BL0PR02MB4579.namprd02.prod.outlook.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 6abd7e78-5617-4d90-8f16-08d918dfa3d6
X-MS-Exchange-CrossTenant-originalarrivaltime: 17 May 2021 02:58:25.4267
 (UTC)
X-MS-Exchange-CrossTenant-fromentityheader: Hosted
X-MS-Exchange-CrossTenant-id: bb047546-786f-4de1-bd75-24e5b6f79043
X-MS-Exchange-CrossTenant-mailboxtype: HOSTED
X-MS-Exchange-CrossTenant-userprincipalname: JjSv/Ur5/fdoD0BQhHXpxPaqFxH8sm8zGjibUnE+XymLt9FRfPJ+WPXsxmI+zciWTyxVE7WjK0CywI+3UAxlrLQV6SpfWAQlR9k7aSs7b18=
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL0PR02MB3809
X-Proofpoint-ORIG-GUID: nfn7XBzk9sZs_EQr_VNxSQQwGusLCBQL
X-Proofpoint-GUID: nfn7XBzk9sZs_EQr_VNxSQQwGusLCBQL
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391,18.0.761
 definitions=2021-05-17_01:2021-05-12,2021-05-17 signatures=0
X-Proofpoint-Spam-Reason: safe
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
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