On 2021-08-10 16:19, Anshuman Khandual wrote:
On 8/10/21 6:59 PM, Marc Zyngier wrote:
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@xxxxxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Alexandru Elisei <alexandru.elisei@xxxxxxx>
Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: kvmarm@xxxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
---
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
Architectural property which suggest the minimum physical address shift
supported on a platform, as indicated via ID_AA64MMFR0.PARANGE = 0x0 ?
That's the one.
M.
--
Jazz is not dead. It just smells funny...
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