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Re: [Qemu-devel] [PATCH v3 03/20] arm64: Add a helper for PARange to phy
From: |
Auger Eric |
Subject: |
Re: [Qemu-devel] [PATCH v3 03/20] arm64: Add a helper for PARange to physical shift conversion |
Date: |
Fri, 29 Jun 2018 16:50:35 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 |
Hi Suzuki,
On 06/29/2018 01:15 PM, Suzuki K Poulose wrote:
> 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 is will be used by the KVM to set the VTCR_EL2.T0SZ, as it
s/is// and s/the KVM/KVM
> is about to move its place. Having this helper keeps the code
> movement cleaner.
>
> Cc: Catalin Marinas <address@hidden>
> Cc: Marc Zyngier <address@hidden>
> Cc: James Morse <address@hidden>
> Cc: Christoffer Dall <address@hidden>
> Signed-off-by: Suzuki K Poulose <address@hidden>
> ---
> Changes since V2:
> - Split the patch
> - Limit the physical shift only for values unrecognized.
> ---
> arch/arm64/include/asm/cpufeature.h | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/arch/arm64/include/asm/cpufeature.h
> b/arch/arm64/include/asm/cpufeature.h
> index 1717ba1..855cf0e 100644
> --- a/arch/arm64/include/asm/cpufeature.h
> +++ b/arch/arm64/include/asm/cpufeature.h
> @@ -530,6 +530,19 @@ 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;
> + default: return CONFIG_ARM64_PA_BITS;
> + }
> +}
> #endif /* __ASSEMBLY__ */
>
> #endif
>
Reviewed-by: Eric Auger <address@hidden>
Thanks
Eric
- [Qemu-devel] [PATCH v3 00/20] arm64: Dynamic & 52bit IPA support, Suzuki K Poulose, 2018/06/29
- [Qemu-devel] [PATCH v3 01/20] virtio: mmio-v1: Validate queue PFN, Suzuki K Poulose, 2018/06/29
- [Qemu-devel] [PATCH v3 02/20] virtio: pci-legacy: Validate queue pfn, Suzuki K Poulose, 2018/06/29
- [Qemu-devel] [PATCH v3 03/20] arm64: Add a helper for PARange to physical shift conversion, Suzuki K Poulose, 2018/06/29
- Re: [Qemu-devel] [PATCH v3 03/20] arm64: Add a helper for PARange to physical shift conversion,
Auger Eric <=
- [Qemu-devel] [PATCH v3 04/20] kvm: arm64: Clean up VTCR_EL2 initialisation, Suzuki K Poulose, 2018/06/29
- [Qemu-devel] [PATCH v3 05/20] kvm: arm/arm64: Fix stage2_flush_memslot for 4 level page table, Suzuki K Poulose, 2018/06/29
- [Qemu-devel] [PATCH v3 06/20] kvm: arm/arm64: Remove spurious WARN_ON, Suzuki K Poulose, 2018/06/29
- [Qemu-devel] [PATCH v3 07/20] kvm: arm/arm64: Prepare for VM specific stage2 translations, Suzuki K Poulose, 2018/06/29
- [Qemu-devel] [PATCH v3 08/20] kvm: arm/arm64: Abstract stage2 pgd table allocation, Suzuki K Poulose, 2018/06/29
- [Qemu-devel] [PATCH v3 10/20] kvm: arm64: Dynamic configuration of VTTBR mask, Suzuki K Poulose, 2018/06/29
- [Qemu-devel] [PATCH v3 09/20] kvm: arm64: Make stage2 page table layout dynamic, Suzuki K Poulose, 2018/06/29