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| author | Ryan Roberts <ryan.roberts@arm.com> | 2023-11-27 14:17:36 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2023-11-27 18:03:50 +0300 |
| commit | 72324ac52ddddb168d8008e36d6a617b9b74f6c1 (patch) | |
| tree | d7bcf75cad1a51cb0101a6cd37513ceae9ca529a /tools/testing/selftests/kvm/lib/aarch64 | |
| parent | d782ac5b2ceebee5d374e13e990655d1a140d3a6 (diff) | |
| download | linux-72324ac52ddddb168d8008e36d6a617b9b74f6c1.tar.xz | |
KVM: selftests: arm64: Determine max ipa size per-page size
We are about to add 52 bit PA guest modes for 4K and 16K pages when the
system supports LPA2. In preparation beef up the logic that parses mmfr0
to also tell us what the maximum supported PA size is for each page
size. Max PA size = 0 implies the page size is not supported at all.
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-12-ryan.roberts@arm.com
Diffstat (limited to 'tools/testing/selftests/kvm/lib/aarch64')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/aarch64/processor.c | 30 |
1 files changed, 25 insertions, 5 deletions
diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c index 6fe12e985ba5..e6ffd9037c37 100644 --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c @@ -492,12 +492,24 @@ uint32_t guest_get_vcpuid(void) return read_sysreg(tpidr_el1); } -void aarch64_get_supported_page_sizes(uint32_t ipa, - bool *ps4k, bool *ps16k, bool *ps64k) +static uint32_t max_ipa_for_page_size(uint32_t vm_ipa, uint32_t gran, + uint32_t not_sup_val, uint32_t ipa52_min_val) +{ + if (gran == not_sup_val) + return 0; + else if (gran >= ipa52_min_val && vm_ipa >= 52) + return 52; + else + return min(vm_ipa, 48U); +} + +void aarch64_get_supported_page_sizes(uint32_t ipa, uint32_t *ipa4k, + uint32_t *ipa16k, uint32_t *ipa64k) { struct kvm_vcpu_init preferred_init; int kvm_fd, vm_fd, vcpu_fd, err; uint64_t val; + uint32_t gran; struct kvm_one_reg reg = { .id = KVM_ARM64_SYS_REG(SYS_ID_AA64MMFR0_EL1), .addr = (uint64_t)&val, @@ -518,9 +530,17 @@ void aarch64_get_supported_page_sizes(uint32_t ipa, err = ioctl(vcpu_fd, KVM_GET_ONE_REG, ®); TEST_ASSERT(err == 0, KVM_IOCTL_ERROR(KVM_GET_ONE_REG, vcpu_fd)); - *ps4k = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_TGRAN4), val) != 0xf; - *ps64k = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_TGRAN64), val) == 0; - *ps16k = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_TGRAN16), val) != 0; + gran = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_TGRAN4), val); + *ipa4k = max_ipa_for_page_size(ipa, gran, ID_AA64MMFR0_EL1_TGRAN4_NI, + ID_AA64MMFR0_EL1_TGRAN4_52_BIT); + + gran = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_TGRAN64), val); + *ipa64k = max_ipa_for_page_size(ipa, gran, ID_AA64MMFR0_EL1_TGRAN64_NI, + ID_AA64MMFR0_EL1_TGRAN64_IMP); + + gran = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64MMFR0_EL1_TGRAN16), val); + *ipa16k = max_ipa_for_page_size(ipa, gran, ID_AA64MMFR0_EL1_TGRAN16_NI, + ID_AA64MMFR0_EL1_TGRAN16_52_BIT); close(vcpu_fd); close(vm_fd); |