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authorAnshuman Khandual <anshuman.khandual@arm.com>2020-05-13 12:03:34 +0300
committerWill Deacon <will@kernel.org>2020-05-20 20:40:13 +0300
commitf73531f0257f6bac44a8c9d5c2f3a3ccaea3d1e9 (patch)
treecde6d2dc288cf9a07106718615fcf1b6a8d899f6 /arch/arm64/kvm
parentc73433fc630cda102f6527d4e5dfd289a9baec08 (diff)
downloadlinux-f73531f0257f6bac44a8c9d5c2f3a3ccaea3d1e9.tar.xz
arm64/cpufeature: Drop open encodings while extracting parange
Currently there are multiple instances of parange feature width mask open encodings while fetching it's value. Even the width mask value (0x7) itself is not accurate. It should be (0xf) per ID_AA64MMFR0_EL1.PARange[3:0] as in ARM ARM (0487F.a). Replace them with cpuid_feature_extract_unsigned_field() which can extract given standard feature (4 bits width i.e 0xf mask) field. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Marc Zyngier <maz@kernel.org> Cc: James Morse <james.morse@arm.com> Cc: kvmarm@lists.cs.columbia.edu Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Acked-by: Marc Zyngier <maz@kernel.org> Acked-by: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/1589360614-1164-1-git-send-email-anshuman.khandual@arm.com Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/kvm')
-rw-r--r--arch/arm64/kvm/reset.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index d4eb6612bb3c..d8800ef4f42d 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -340,8 +340,11 @@ u32 get_kvm_ipa_limit(void)
void kvm_set_ipa_limit(void)
{
unsigned int ipa_max, pa_max, va_max, parange;
+ u64 mmfr0;
- parange = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1) & 0x7;
+ mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+ parange = cpuid_feature_extract_unsigned_field(mmfr0,
+ ID_AA64MMFR0_PARANGE_SHIFT);
pa_max = id_aa64mmfr0_parange_to_phys_shift(parange);
/* Clamp the IPA limit to the PA size supported by the kernel */
@@ -387,7 +390,7 @@ void kvm_set_ipa_limit(void)
*/
int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
{
- u64 vtcr = VTCR_EL2_FLAGS;
+ u64 vtcr = VTCR_EL2_FLAGS, mmfr0;
u32 parange, phys_shift;
u8 lvls;
@@ -403,7 +406,9 @@ int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
phys_shift = KVM_PHYS_SHIFT;
}
- parange = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1) & 7;
+ mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
+ parange = cpuid_feature_extract_unsigned_field(mmfr0,
+ ID_AA64MMFR0_PARANGE_SHIFT);
if (parange > ID_AA64MMFR0_PARANGE_MAX)
parange = ID_AA64MMFR0_PARANGE_MAX;
vtcr |= parange << VTCR_EL2_PS_SHIFT;