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Tue, 10 May 2022 12:33:42 +0000 Message-ID: <5ad0f302-c1e1-b400-c3f3-a97c1cd443e8@amazon.com> Date: Tue, 10 May 2022 14:33:40 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.9.0 Subject: Re: [PATCH v2] KVM: PPC: Book3S PR: Enable MSR_DR for switch_mmu_context() To: Christophe Leroy , "kvm@vger.kernel.org" CC: "linuxppc-dev@lists.ozlabs.org" , "linux-kernel@vger.kernel.org" , Paul Mackerras , Benjamin Herrenschmidt , Michael Ellerman , Matt Evans , "stable@vger.kernel.org" References: <20220510111809.15987-1-graf@amazon.com> From: Alexander Graf In-Reply-To: X-Originating-IP: [10.43.161.183] X-ClientProxiedBy: EX13D03UWA002.ant.amazon.com (10.43.160.144) To EX13D20UWC001.ant.amazon.com (10.43.162.244) Content-Type: text/plain; charset="utf-8"; format="flowed" Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Ck9uIDEwLjA1LjIyIDEzOjMxLCBDaHJpc3RvcGhlIExlcm95IHdyb3RlOgo+IExlIDEwLzA1LzIw MjIgw6AgMTM6MTgsIEFsZXhhbmRlciBHcmFmIGEgw6ljcml0IDoKPj4gQ29tbWl0IDg2Mzc3MWEy OGUyNyAoInBvd2VycGMvMzJzOiBDb252ZXJ0IHN3aXRjaF9tbXVfY29udGV4dCgpIHRvIEMiKQo+ PiBtb3ZlZCB0aGUgc3dpdGNoX21tdV9jb250ZXh0KCkgdG8gQy4gV2hpbGUgaW4gcHJpbmNpcGxl IGEgZ29vZCBpZGVhLCBpdAo+PiBtZWFudCB0aGF0IHRoZSBmdW5jdGlvbiBub3cgdXNlcyB0aGUg c3RhY2suIFRoZSBzdGFjayBpcyBub3QgYWNjZXNzaWJsZQo+PiBmcm9tIHJlYWwgbW9kZSB0aG91 Z2guCj4+Cj4+IFNvIHRvIGtlZXAgY2FsbGluZyB0aGUgZnVuY3Rpb24sIGxldCdzIHR1cm4gb24g TVNSX0RSIHdoaWxlIHdlIGNhbGwgaXQuCj4+IFRoYXQgd2F5LCBhbGwgcG9pbnRlciByZWZlcmVu Y2VzIHRvIHRoZSBzdGFjayBhcmUgaGFuZGxlZCB2aXJ0dWFsbHkuCj4gSXMgdGhlIHN5c3RlbSBy ZWFkeSB0byBoYW5kbGUgYSBEU0kgaW4gY2FzZSB0aGUgc3RhY2sgaXMgbm90IG1hcHBlZCA/CgoK QSBEU0kgaXRzZWxmIHdpbGwgYmUgYW4gaW50ZXJydXB0IGFnYWluIHdoaWNoIHdpbGwgaW4gdHVy biBkZXN0cm95IHRoZSAKU1BSRyB0aGF0IHdlJ3JlIHNhdmluZy4gR3Vlc3MgSSB3YXMgdHJ5aW5n IHRvIGJlIHRvbyBzbWFydCA6KS4gSSdsbCB1c2UgCk1hdHQncyBvcmlnaW5hbCBzdWdnZXN0aW9u IGFuZCBqdXN0IHB1dCBpdCBvbiB0aGUgc3RhY2suCgoKPj4gSW4gYWRkaXRpb24sIG1ha2Ugc3Vy ZSB0byBzYXZlL3Jlc3RvcmUgcjEyIGluIGFuIFNQUkcsIGFzIGl0IG1heSBnZXQKPj4gY2xvYmJl cmVkIGJ5IHRoZSBDIGZ1bmN0aW9uLgo+Pgo+PiBSZXBvcnRlZC1ieTogTWF0dCBFdmFucyA8bWF0 dEBvemxhYnMub3JnPgo+PiBGaXhlczogODYzNzcxYTI4ZTI3ICgicG93ZXJwYy8zMnM6IENvbnZl cnQgc3dpdGNoX21tdV9jb250ZXh0KCkgdG8gQyIpCj4gT29wcywgc29ycnkgZm9yIHRoYXQuIEkg ZGlkbid0IHJlYWxpc2UgdGhhdCB0aGVyZSB3YXMgb3RoZXIgY2FsbGVycyB0bwo+IHN3aXRjaF9t bXVfY29udGV4dCgpIHRoYW4gc3dpdGNoX21tX2lycXNfb2ZmKCkuCgoKTm8gd29ycmllcywgdGhl IGNvbXBpbGVkIEMgdmVyc2lvbiBsb29rcyBhIGxvdCBuaWNlciB0aGFuIHRoZSBwcmV2aW91cyAK YXNtIG9uZSAtIGFuZCBpdCB3YXMgYSBnb29kIHdheSB0byBpZGVudGlmeSB3aGV0aGVyIHRoZXJl IHN0aWxsIGFyZSAKdXNlcnMgb2YgS1ZNIG9uIEJvb2szUyAzMmJpdCBvdXQgdGhlcmUgOikKCgpB bGV4CgoKCgoKQW1hem9uIERldmVsb3BtZW50IENlbnRlciBHZXJtYW55IEdtYkgKS3JhdXNlbnN0 ci4gMzgKMTAxMTcgQmVybGluCkdlc2NoYWVmdHNmdWVocnVuZzogQ2hyaXN0aWFuIFNjaGxhZWdl ciwgSm9uYXRoYW4gV2Vpc3MKRWluZ2V0cmFnZW4gYW0gQW10c2dlcmljaHQgQ2hhcmxvdHRlbmJ1 cmcgdW50ZXIgSFJCIDE0OTE3MyBCClNpdHo6IEJlcmxpbgpVc3QtSUQ6IERFIDI4OSAyMzcgODc5 CgoK