github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-24 23:22:31 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

KVM: arm64: selftests: Add a test for FEAT_IDST

Browse Source 
Add a very basic test checking that FEAT_IDST actually works for
the {GMID,SMIDR,CSSIDR2}_EL1 registers.

Link: https://patch.msgid.link/20260108173233.2911955-10-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2026-01-08 17:32:33 +00:00
parent 592dc2c020
commit b638a9d0f8
2 changed files with 118 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/testing/selftests/kvm/Makefile.kvm
View File

@ -175,6 +175,7 @@ TEST_GEN_PROGS_arm64 += arm64/vgic_irq
TEST_GEN_PROGS_arm64 += arm64/vgic_lpi_stress
TEST_GEN_PROGS_arm64 += arm64/vpmu_counter_access
TEST_GEN_PROGS_arm64 += arm64/no-vgic-v3
TEST_GEN_PROGS_arm64 += arm64/idreg-idst
TEST_GEN_PROGS_arm64 += arm64/kvm-uuid
TEST_GEN_PROGS_arm64 += access_tracking_perf_test
TEST_GEN_PROGS_arm64 += arch_timer

117
tools/testing/selftests/kvm/arm64/idreg-idst.c Normal file
View File

@ -0,0 +1,117 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Access all FEAT_IDST-handled registers that depend on more than
* just FEAT_AA64, and fail if we don't get an a trap with an 0x18 EC.
*/
#include <test_util.h>
#include <kvm_util.h>
#include <processor.h>
static volatile bool sys64, undef;
#define __check_sr_read(r) \
({ \
uint64_t val; \
\
sys64 = false; \
undef = false; \
dsb(sy); \
val = read_sysreg_s(SYS_ ## r); \
val; \
})
/* Fatal checks */
#define check_sr_read(r) \
do { \
__check_sr_read(r); \
__GUEST_ASSERT(!undef, #r " unexpected UNDEF"); \
__GUEST_ASSERT(sys64, #r " didn't trap"); \
} while(0)
static void guest_code(void)
{
check_sr_read(CCSIDR2_EL1);
check_sr_read(SMIDR_EL1);
check_sr_read(GMID_EL1);
GUEST_DONE();
}
static void guest_sys64_handler(struct ex_regs *regs)
{
sys64 = true;
undef = false;
regs->pc += 4;
}
static void guest_undef_handler(struct ex_regs *regs)
{
sys64 = false;
undef = true;
regs->pc += 4;
}
static void test_run_vcpu(struct kvm_vcpu *vcpu)
{
struct ucall uc;
do {
vcpu_run(vcpu);
switch (get_ucall(vcpu, &uc)) {
case UCALL_ABORT:
REPORT_GUEST_ASSERT(uc);
break;
case UCALL_PRINTF:
printf("%s", uc.buffer);
break;
case UCALL_DONE:
break;
default:
TEST_FAIL("Unknown ucall %lu", uc.cmd);
}
} while (uc.cmd != UCALL_DONE);
}
static void test_guest_feat_idst(void)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
/* This VM has no MTE, no SME, no CCIDX */
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
vm_init_descriptor_tables(vm);
vcpu_init_descriptor_tables(vcpu);
vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT,
ESR_ELx_EC_SYS64, guest_sys64_handler);
vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT,
ESR_ELx_EC_UNKNOWN, guest_undef_handler);
test_run_vcpu(vcpu);
kvm_vm_free(vm);
}
int main(int argc, char *argv[])
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
uint64_t mmfr2;
test_disable_default_vgic();
vm = vm_create_with_one_vcpu(&vcpu, NULL);
mmfr2 = vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_ID_AA64MMFR2_EL1));
__TEST_REQUIRE(FIELD_GET(ID_AA64MMFR2_EL1_IDS, mmfr2) > 0,
"FEAT_IDST not supported");
kvm_vm_free(vm);
test_guest_feat_idst();
return 0;
}