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KVM: arm64: selftests: Add basic test for running in VHE EL2

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Add an embarrassingly simple selftest for sanity checking KVM's VHE EL2
and test that the ID register bits are consistent with HCR_EL2.E2H being
RES1.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Oliver Upton
2025-09-17 14:20:43 -07:00
committed by Marc Zyngier
parent 2de21fb623
commit f677b0efa9
2 changed files with 59 additions and 0 deletions
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1
tools/testing/selftests/kvm/Makefile.kvm
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@@ -156,6 +156,7 @@ TEST_GEN_PROGS_arm64 = $(TEST_GEN_PROGS_COMMON)
TEST_GEN_PROGS_arm64 += arm64/aarch32_id_regs
TEST_GEN_PROGS_arm64 += arm64/arch_timer_edge_cases
TEST_GEN_PROGS_arm64 += arm64/debug-exceptions
TEST_GEN_PROGS_arm64 += arm64/hello_el2
TEST_GEN_PROGS_arm64 += arm64/host_sve
TEST_GEN_PROGS_arm64 += arm64/hypercalls
TEST_GEN_PROGS_arm64 += arm64/external_aborts

58
tools/testing/selftests/kvm/arm64/hello_el2.c Normal file
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@@ -0,0 +1,58 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* hello_el2 - Basic KVM selftest for VM running at EL2 with E2H=RES1
*
* Copyright 2025 Google LLC
*/
#include "kvm_util.h"
#include "processor.h"
#include "test_util.h"
#include "ucall.h"
#include <asm/sysreg.h>
static void guest_code(void)
{
u64 mmfr1 = read_sysreg_s(SYS_ID_AA64MMFR1_EL1);
u64 mmfr4 = read_sysreg_s(SYS_ID_AA64MMFR4_EL1);
GUEST_ASSERT_EQ(get_current_el(), 2);
GUEST_ASSERT(read_sysreg(hcr_el2) & HCR_EL2_E2H);
GUEST_ASSERT_EQ(SYS_FIELD_GET(ID_AA64MMFR1_EL1, VH, mmfr1),
ID_AA64MMFR1_EL1_VH_IMP);
GUEST_ASSERT_EQ(SYS_FIELD_GET(ID_AA64MMFR4_EL1, E2H0, mmfr4),
ID_AA64MMFR4_EL1_E2H0_NI_NV1);
GUEST_DONE();
}
int main(void)
{
struct kvm_vcpu_init init;
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
struct ucall uc;
TEST_REQUIRE(kvm_check_cap(KVM_CAP_ARM_EL2));
vm = vm_create(1);
kvm_get_default_vcpu_target(vm, &init);
init.features[0] |= BIT(KVM_ARM_VCPU_HAS_EL2);
vcpu = aarch64_vcpu_add(vm, 0, &init, guest_code);
kvm_arch_vm_finalize_vcpus(vm);
vcpu_run(vcpu);
switch (get_ucall(vcpu, &uc)) {
case UCALL_DONE:
break;
case UCALL_ABORT:
REPORT_GUEST_ASSERT(uc);
break;
default:
TEST_FAIL("Unhandled ucall: %ld\n", uc.cmd);
}
kvm_vm_free(vm);
return 0;
}