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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jun 2025 18:39:13.2882 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a74af8df-cf1a-431f-1b37-08ddadce41b7 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DB5PEPF00014B95.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB9958 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250617_113928_563850_BF9CD070 X-CRM114-Status: GOOD ( 16.71 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Marc, > On Wed, 11 Jun 2025 14:58:10 +0100, > Yeoreum Yun wrote: > > > > Add FEAT_MTE_TAGGED_FAR cpucap which makes FAR_ELx report > > all non-address bits on a synchronous MTE tag check fault since Armv8.9 > > > > Signed-off-by: Yeoreum Yun > > Acked-by: Yury Khrustalev > > --- > > arch/arm64/kernel/cpufeature.c | 8 ++++++++ > > arch/arm64/tools/cpucaps | 1 + > > 2 files changed, 9 insertions(+) > > > > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > > index b34044e20128..af6a6924a3e8 100644 > > --- a/arch/arm64/kernel/cpufeature.c > > +++ b/arch/arm64/kernel/cpufeature.c > > @@ -320,6 +320,7 @@ static const struct arm64_ftr_bits ftr_id_aa64pfr1[] = { > > > > static const struct arm64_ftr_bits ftr_id_aa64pfr2[] = { > > ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL1_FPMR_SHIFT, 4, 0), > > + ARM64_FTR_BITS(FTR_VISIBLE, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64PFR2_EL1_MTEFAR_SHIFT, 4, ID_AA64PFR2_EL1_MTEFAR_NI), > > ARM64_FTR_END, > > }; > > Same thing as the remark I had on FEAT_LSUI: for anything that does > not introduce extra state, please similarly enable the feature in KVM. > There is no point in these discrepancies. > > For anything that has extra state, you should at least consider what > needs to be done. > > Thanks, Okay. I'll expose this to guest. Thanks. -- Sincerely, Yeoreum Yun