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Mon, 09 Dec 2024 15:15:57 +0000 Date: Mon, 09 Dec 2024 15:15:56 +0000 Message-ID: <864j3cubtf.wl-maz@kernel.org> From: Marc Zyngier To: Chase Conklin Cc: andersson@kernel.org, christoffer.dall@arm.com, joey.gouly@arm.com, kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, oliver.upton@linux.dev, suzuki.poulose@arm.com, yuzenghui@huawei.com Subject: Re: [PATCH 00/11] KVM: arm64: Add NV timer support In-Reply-To: <20241209142429.882-1-chase.conklin@arm.com> References: <20241202172134.384923-1-maz@kernel.org> <20241209142429.882-1-chase.conklin@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/29.4 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: chase.conklin@arm.com, andersson@kernel.org, christoffer.dall@arm.com, joey.gouly@arm.com, kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, oliver.upton@linux.dev, suzuki.poulose@arm.com, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241209_071600_683089_24CEFDC0 X-CRM114-Status: GOOD ( 20.60 ) 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 Chase, On Mon, 09 Dec 2024 14:24:29 +0000, Chase Conklin wrote: > > Hi Marc, > > On Mon, 2 Dec 2024 17:21:23 +0000, Marc Zyngier > wrote: > > > If you are feeling brave, you can run the whole thing from [1]. > > > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/log/?h=kvm-arm64/nv-next > > > > I was feeling brave, and I think I see an issue in the cpufeature change > in the kvm-arm64/nv-e2h-select branch that's a part of > kvm-arm64/nv-next. In d75a4820a897 ("arm64: cpufeature: Handle NV_frac as a synonym of NV2"), > I don't see NV_frac being added to the FTR bits. I believe that means it > will get sanitized out and consequently not seen by the NV feature > detection code. Does that commit also need: > > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > index 9fa8bd77ae0..f97459e160b 100644 > --- a/arch/arm64/kernel/cpufeature.c > +++ b/arch/arm64/kernel/cpufeature.c > @@ -480,6 +480,7 @@ static const struct arm64_ftr_bits ftr_id_aa64mmfr3[] = { > > static const struct arm64_ftr_bits ftr_id_aa64mmfr4[] = { > S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR4_EL1_E2H0_SHIFT, 4, 0), > + S_ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR4_EL1_NV_frac_SHIFT, 4, 0), > ARM64_FTR_END, > }; Ah, I always get tripped by that one. You are absolutely correct, this is needed. I'll fold that in. Thanks again, M. -- Without deviation from the norm, progress is not possible.