[PATCH 5/5] KVM: arm64: Define KVM_PHYS_SHIFT_MIN
Marc Zyngier
maz at kernel.org
Tue Aug 10 06:29:14 PDT 2021
On 2021-08-10 08:02, Anshuman Khandual wrote:
> Drop the hard coded value for the minimum IPA range i.e 32 bit. Instead
> define a macro KVM_PHYS_SHIFT_MIN which improves the code readability.
>
> Cc: Marc Zyngier <maz at kernel.org>
> Cc: James Morse <james.morse at arm.com>
> Cc: Alexandru Elisei <alexandru.elisei at arm.com>
> Cc: Suzuki K Poulose <suzuki.poulose at arm.com>
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Will Deacon <will at kernel.org>
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: kvmarm at lists.cs.columbia.edu
> Cc: linux-kernel at vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual at arm.com>
> ---
> arch/arm64/include/asm/kvm_mmu.h | 3 ++-
> arch/arm64/kvm/reset.c | 2 +-
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_mmu.h
> b/arch/arm64/include/asm/kvm_mmu.h
> index b52c5c4b9a3d..716f999818d9 100644
> --- a/arch/arm64/include/asm/kvm_mmu.h
> +++ b/arch/arm64/include/asm/kvm_mmu.h
> @@ -141,7 +141,8 @@ static __always_inline unsigned long
> __kern_hyp_va(unsigned long v)
> * We currently support using a VM-specified IPA size. For backward
> * compatibility, the default IPA size is fixed to 40bits.
> */
> -#define KVM_PHYS_SHIFT (40)
> +#define KVM_PHYS_SHIFT (40)
> +#define KVM_PHYS_SHIFT_MIN (32)
>
> #define kvm_phys_shift(kvm) VTCR_EL2_IPA(kvm->arch.vtcr)
> #define kvm_phys_size(kvm) (_AC(1, ULL) << kvm_phys_shift(kvm))
> diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
> index cba7872d69a8..8dc8b4b9de37 100644
> --- a/arch/arm64/kvm/reset.c
> +++ b/arch/arm64/kvm/reset.c
> @@ -369,7 +369,7 @@ int kvm_arm_setup_stage2(struct kvm *kvm, unsigned
> long type)
> phys_shift = KVM_VM_TYPE_ARM_IPA_SIZE(type);
> if (phys_shift) {
> if (phys_shift > kvm_ipa_limit ||
> - phys_shift < 32)
> + phys_shift < KVM_PHYS_SHIFT_MIN)
> return -EINVAL;
> } else {
> phys_shift = KVM_PHYS_SHIFT;
This is not a KVM property, but an architectural one. If you
want to replace it with something more readable, please
make it global to the whole of arm64 (ARM64_MIN_PARANGE?).
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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