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Tue, 19 Aug 2025 09:35:07 +0100 Date: Tue, 19 Aug 2025 09:35:06 +0100 Message-ID: <87sehnk8ud.wl-maz@kernel.org> From: Marc Zyngier To: Anshuman Khandual Cc: Mark Rutland , linux-arm-kernel@lists.infradead.org, Catalin Marinas , Will Deacon , Oliver Upton , Mark Brown , Ryan Roberts , kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH 4/4] arm64/sysreg: Add VTCR_EL2 register In-Reply-To: References: <20250818045759.672408-1-anshuman.khandual@arm.com> <20250818045759.672408-5-anshuman.khandual@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/30.1 (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: 86.149.246.145 X-SA-Exim-Rcpt-To: anshuman.khandual@arm.com, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, broonie@kernel.org, ryan.roberts@arm.com, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org 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-20250819_013515_349221_C82C0220 X-CRM114-Status: GOOD ( 20.52 ) 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 On Tue, 19 Aug 2025 05:24:29 +0100, Anshuman Khandual wrote: > > > > On 18/08/25 2:52 PM, Mark Rutland wrote: > > On Mon, Aug 18, 2025 at 10:27:59AM +0530, Anshuman Khandual wrote: > >> diff --git a/arch/arm64/tools/sysreg b/arch/arm64/tools/sysreg > >> index d2b40105eb41..f5a0a304f844 100644 > >> --- a/arch/arm64/tools/sysreg > >> +++ b/arch/arm64/tools/sysreg > >> @@ -4910,6 +4910,63 @@ Field 1 PIE > >> Field 0 PnCH > >> EndSysreg > >> > >> +Sysreg VTCR_EL2 3 4 2 1 2 > >> +Res0 63:46 > >> +Field 45 HDBSS > >> +Field 44 HAFT > >> +Res0 43:42 > >> +Field 41 TL0 > >> +Field 40 GCSH > >> +Res0 39 > >> +Field 38 D128 > >> +Field 37 S2POE > >> +Field 36 S2PIE > >> +Field 35 TL1 > >> +Field 34 AssuredOnly > >> +Field 33 SL2 > >> +Field 32 DS > >> +Res1 31 > >> +Field 30 NSA > >> +Field 29 NSW > >> +Field 28 HWU62 > >> +Field 27 HWU61 > >> +Field 26 HWU60 > >> +Field 25 HWU59 > >> +Res0 24:23 > >> +Field 22 HD > >> +Field 21 HA > >> +Res0 20 > >> +UnsignedEnum 19 VS > >> + 0b0 8BIT > >> + 0b1 16BIT > >> +EndEnum > > > > You left TCR_EL1.AS as a single-bit 'Field', so please do the same here > > for consistency. I don't think there's much gained by making this any > > sort of enum. > > But actually there is an use case in kvm_get_vtcr(). > > /* Set the vmid bits */ > vtcr |= (get_vmid_bits(mmfr1) == 16) ? > SYS_FIELD_PREP_ENUM(VTCR_EL2, VS, 16BIT) : > SYS_FIELD_PREP_ENUM(VTCR_EL2, VS, 8BIT); > Here you go (untested): diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c index c351b4abd5db..49266efc8bab 100644 --- a/arch/arm64/kvm/hyp/pgtable.c +++ b/arch/arm64/kvm/hyp/pgtable.c @@ -623,10 +623,7 @@ u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift) if (kvm_lpa2_is_enabled()) vtcr |= VTCR_EL2_DS; - /* Set the vmid bits */ - vtcr |= (get_vmid_bits(mmfr1) == 16) ? - VTCR_EL2_VS_16BIT : - VTCR_EL2_VS_8BIT; + vtcr |= FIELD_PREP(BIT(VTCR_EL2_VS_SHIFT), (get_vmid_bits(mmfr1) == 16)); return vtcr; } M. -- Jazz isn't dead. It just smells funny.