From: Suzuki K Poulose <suzuki.poulose@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, marc.zyngier@arm.com, cdall@kernel.org, eric.auger@redhat.com, pbonzini@redhat.com, rkrcmar@redhat.com, will.deacon@arm.com, catalin.marinas@arm.com, james.morse@arm.com, dave.martin@arm.com, julien.grall@arm.com, linux-kernel@vger.kernel.org, suzuki.poulose@arm.com Subject: [PATCH v5 04/18] arm64: Add a helper for PARange to physical shift conversion Date: Mon, 17 Sep 2018 11:41:26 +0100 [thread overview] Message-ID: <20180917104144.19188-5-suzuki.poulose@arm.com> (raw) In-Reply-To: <20180917104144.19188-1-suzuki.poulose@arm.com> On arm64, ID_AA64MMFR0_EL1.PARange encodes the maximum Physical Address range supported by the CPU. Add a helper to decode this to actual physical shift. If we hit an unallocated value, return the maximum range supported by the kernel. This will be used by KVM to set the VTCR_EL2.T0SZ, as it is about to move its place. Having this helper keeps the code movement cleaner. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Christoffer Dall <cdall@kernel.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- Changes since V4: - Add a comment on the result for unknown values. --- arch/arm64/include/asm/cpufeature.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 1717ba1db35d..072cc1c970c2 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -530,6 +530,26 @@ void arm64_set_ssbd_mitigation(bool state); static inline void arm64_set_ssbd_mitigation(bool state) {} #endif +static inline u32 id_aa64mmfr0_parange_to_phys_shift(int parange) +{ + switch (parange) { + case 0: return 32; + case 1: return 36; + case 2: return 40; + case 3: return 42; + case 4: return 44; + case 5: return 48; + case 6: return 52; + /* + * A future PE could use a value unknown to the kernel. + * However, by the "D10.1.4 Principles of the ID scheme + * for fields in ID registers", ARM DDI 0487C.a, any new + * value is guaranteed to be higher than what we know already. + * As a safe limit, we return the limit supported by the kernel. + */ + default: return CONFIG_ARM64_PA_BITS; + } +} #endif /* __ASSEMBLY__ */ #endif -- 2.19.0
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From: suzuki.poulose@arm.com (Suzuki K Poulose) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 04/18] arm64: Add a helper for PARange to physical shift conversion Date: Mon, 17 Sep 2018 11:41:26 +0100 [thread overview] Message-ID: <20180917104144.19188-5-suzuki.poulose@arm.com> (raw) In-Reply-To: <20180917104144.19188-1-suzuki.poulose@arm.com> On arm64, ID_AA64MMFR0_EL1.PARange encodes the maximum Physical Address range supported by the CPU. Add a helper to decode this to actual physical shift. If we hit an unallocated value, return the maximum range supported by the kernel. This will be used by KVM to set the VTCR_EL2.T0SZ, as it is about to move its place. Having this helper keeps the code movement cleaner. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Christoffer Dall <cdall@kernel.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- Changes since V4: - Add a comment on the result for unknown values. --- arch/arm64/include/asm/cpufeature.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 1717ba1db35d..072cc1c970c2 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -530,6 +530,26 @@ void arm64_set_ssbd_mitigation(bool state); static inline void arm64_set_ssbd_mitigation(bool state) {} #endif +static inline u32 id_aa64mmfr0_parange_to_phys_shift(int parange) +{ + switch (parange) { + case 0: return 32; + case 1: return 36; + case 2: return 40; + case 3: return 42; + case 4: return 44; + case 5: return 48; + case 6: return 52; + /* + * A future PE could use a value unknown to the kernel. + * However, by the "D10.1.4 Principles of the ID scheme + * for fields in ID registers", ARM DDI 0487C.a, any new + * value is guaranteed to be higher than what we know already. + * As a safe limit, we return the limit supported by the kernel. + */ + default: return CONFIG_ARM64_PA_BITS; + } +} #endif /* __ASSEMBLY__ */ #endif -- 2.19.0
next prev parent reply other threads:[~2018-09-17 10:42 UTC|newest] Thread overview: 120+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-09-17 10:41 [PATCH v5 00/18] kvm: arm64: Dynamic IPA and 52bit IPA Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 01/18] kvm: arm/arm64: Fix stage2_flush_memslot for 4 level page table Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 02/18] kvm: arm/arm64: Remove spurious WARN_ON Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 03/18] kvm: arm64: Add helper for loading the stage2 setting for a VM Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose [this message] 2018-09-17 10:41 ` [PATCH v5 04/18] arm64: Add a helper for PARange to physical shift conversion Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 05/18] kvm: arm64: Clean up VTCR_EL2 initialisation Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 06/18] kvm: arm/arm64: Allow arch specific configurations for VM Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-20 10:22 ` Auger Eric 2018-09-20 10:22 ` Auger Eric 2018-09-20 10:22 ` Auger Eric 2018-09-17 10:41 ` [PATCH v5 07/18] kvm: arm64: Configure VTCR_EL2 per VM Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-20 10:21 ` Auger Eric 2018-09-20 10:21 ` Auger Eric 2018-09-20 10:38 ` Suzuki K Poulose 2018-09-20 10:38 ` Suzuki K Poulose 2018-09-20 10:38 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 08/18] kvm: arm/arm64: Prepare for VM specific stage2 translations Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-20 14:07 ` Auger Eric 2018-09-20 14:07 ` Auger Eric 2018-09-20 14:07 ` Auger Eric 2018-09-17 10:41 ` [PATCH v5 09/18] kvm: arm64: Prepare for dynamic stage2 page table layout Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 10/18] kvm: arm64: Make stage2 page table layout dynamic Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-20 14:07 ` Auger Eric 2018-09-20 14:07 ` Auger Eric 2018-09-17 10:41 ` [PATCH v5 11/18] kvm: arm64: Dynamic configuration of VTTBR mask Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-20 14:07 ` Auger Eric 2018-09-20 14:07 ` Auger Eric 2018-09-20 15:22 ` Suzuki K Poulose 2018-09-20 15:22 ` Suzuki K Poulose 2018-09-20 15:22 ` Suzuki K Poulose 2018-09-25 11:56 ` Auger Eric 2018-09-25 11:56 ` Auger Eric 2018-09-17 10:41 ` [PATCH v5 12/18] kvm: arm64: Configure VTCR_EL2.SL0 per VM Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-20 14:25 ` Auger Eric 2018-09-20 14:25 ` Auger Eric 2018-09-20 15:25 ` Suzuki K Poulose 2018-09-20 15:25 ` Suzuki K Poulose 2018-09-20 15:25 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 13/18] kvm: arm64: Switch to per VM IPA limit Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 14/18] vgic: Add support for 52bit guest physical address Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-21 14:57 ` Auger Eric 2018-09-21 14:57 ` Auger Eric 2018-09-25 10:49 ` Suzuki K Poulose 2018-09-25 10:49 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 15/18] kvm: arm64: Add 52bit support for PAR to HPFAR conversoin Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-25 9:59 ` Auger Eric 2018-09-25 9:59 ` Auger Eric 2018-09-17 10:41 ` [PATCH v5 16/18] kvm: arm64: Set a limit on the IPA size Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-25 9:59 ` Auger Eric 2018-09-25 9:59 ` Auger Eric 2018-09-25 9:59 ` Auger Eric 2018-09-25 11:10 ` Suzuki K Poulose 2018-09-25 11:10 ` Suzuki K Poulose 2018-09-25 11:10 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 17/18] kvm: arm64: Limit the minimum number of page table levels Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-25 10:00 ` Auger Eric 2018-09-25 10:00 ` Auger Eric 2018-09-25 10:25 ` Suzuki K Poulose 2018-09-25 10:25 ` Suzuki K Poulose 2018-09-17 10:41 ` [PATCH v5 18/18] kvm: arm64: Allow tuning the physical address size for VM Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 14:20 ` Peter Maydell 2018-09-17 14:20 ` Peter Maydell 2018-09-17 14:43 ` Suzuki K Poulose 2018-09-17 14:43 ` Suzuki K Poulose 2018-09-18 1:55 ` Peter Maydell 2018-09-18 1:55 ` Peter Maydell 2018-09-18 1:55 ` Peter Maydell 2018-09-18 15:16 ` Suzuki K Poulose 2018-09-18 15:16 ` Suzuki K Poulose 2018-09-18 15:36 ` Peter Maydell 2018-09-18 15:36 ` Peter Maydell 2018-09-18 16:27 ` Suzuki K Poulose 2018-09-18 16:27 ` Suzuki K Poulose 2018-09-18 16:27 ` Suzuki K Poulose 2018-09-18 17:15 ` Peter Maydell 2018-09-18 17:15 ` Peter Maydell 2018-09-19 10:03 ` Suzuki K Poulose 2018-09-19 10:03 ` Suzuki K Poulose 2018-09-19 10:03 ` Suzuki K Poulose 2018-09-25 10:00 ` Auger Eric 2018-09-25 10:00 ` Auger Eric 2018-09-25 10:24 ` Suzuki K Poulose 2018-09-25 10:24 ` Suzuki K Poulose 2018-09-25 10:24 ` Suzuki K Poulose 2018-09-17 10:41 ` [kvmtool PATCH v5 19/18] kvmtool: Allow backends to run checks on the KVM device fd Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` [kvmtool PATCH v5 20/18] kvmtool: arm64: Add support for guest physical address size Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` [kvmtool PATCH v5 21/18] kvmtool: arm64: Switch memory layout Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` [kvmtool PATCH v5 22/18] kvmtool: arm: Add support for creating VM with PA size Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose 2018-09-17 10:41 ` Suzuki K Poulose
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