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KVM: selftests: arm64: Test vCPU-scoped feature ID registers

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Test that CLIDR_EL1 and MPIDR_EL1 are modifiable from userspace and that
the values are preserved across a vCPU reset like the other feature ID
registers.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240502233529.1958459-8-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Oliver Upton 2024-05-02 23:35:29 +00:00 committed by Marc Zyngier
parent 07eabd8a52
commit 606af8293c
1 changed files with 52 additions and 1 deletions
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53
tools/testing/selftests/kvm/aarch64/set_id_regs.c
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@ -457,6 +457,53 @@ static void test_guest_reg_read(struct kvm_vcpu *vcpu)
}
}
/* Politely lifted from arch/arm64/include/asm/cache.h */
/* Ctypen, bits[3(n - 1) + 2 : 3(n - 1)], for n = 1 to 7 */
#define CLIDR_CTYPE_SHIFT(level) (3 * (level - 1))
#define CLIDR_CTYPE_MASK(level) (7 << CLIDR_CTYPE_SHIFT(level))
#define CLIDR_CTYPE(clidr, level) \
(((clidr) & CLIDR_CTYPE_MASK(level)) >> CLIDR_CTYPE_SHIFT(level))
static void test_clidr(struct kvm_vcpu *vcpu)
{
uint64_t clidr;
int level;
vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_CLIDR_EL1), &clidr);
/* find the first empty level in the cache hierarchy */
for (level = 1; level < 7; level++) {
if (!CLIDR_CTYPE(clidr, level))
break;
}
/*
* If you have a mind-boggling 7 levels of cache, congratulations, you
* get to fix this.
*/
TEST_ASSERT(level <= 7, "can't find an empty level in cache hierarchy");
/* stick in a unified cache level */
clidr |= BIT(2) << CLIDR_CTYPE_SHIFT(level);
vcpu_set_reg(vcpu, KVM_ARM64_SYS_REG(SYS_CLIDR_EL1), clidr);
test_reg_vals[encoding_to_range_idx(SYS_CLIDR_EL1)] = clidr;
}
static void test_vcpu_ftr_id_regs(struct kvm_vcpu *vcpu)
{
u64 val;
test_clidr(vcpu);
vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_MPIDR_EL1), &val);
val++;
vcpu_set_reg(vcpu, KVM_ARM64_SYS_REG(SYS_MPIDR_EL1), val);
test_reg_vals[encoding_to_range_idx(SYS_MPIDR_EL1)] = val;
ksft_test_result_pass("%s\n", __func__);
}
static void test_assert_id_reg_unchanged(struct kvm_vcpu *vcpu, uint32_t encoding)
{
size_t idx = encoding_to_range_idx(encoding);
@ -477,6 +524,8 @@ static void test_reset_preserves_id_regs(struct kvm_vcpu *vcpu)
for (int i = 0; i < ARRAY_SIZE(test_regs); i++)
test_assert_id_reg_unchanged(vcpu, test_regs[i].reg);
test_assert_id_reg_unchanged(vcpu, SYS_CLIDR_EL1);
ksft_test_result_pass("%s\n", __func__);
}
@ -504,11 +553,13 @@ int main(void)
ARRAY_SIZE(ftr_id_aa64isar2_el1) + ARRAY_SIZE(ftr_id_aa64pfr0_el1) +
ARRAY_SIZE(ftr_id_aa64mmfr0_el1) + ARRAY_SIZE(ftr_id_aa64mmfr1_el1) +
ARRAY_SIZE(ftr_id_aa64mmfr2_el1) + ARRAY_SIZE(ftr_id_aa64zfr0_el1) -
ARRAY_SIZE(test_regs) + 1;
ARRAY_SIZE(test_regs) + 2;
ksft_set_plan(test_cnt);
test_vm_ftr_id_regs(vcpu, aarch64_only);
test_vcpu_ftr_id_regs(vcpu);
test_guest_reg_read(vcpu);
test_reset_preserves_id_regs(vcpu);