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KVM: arm64: selftests: Test with every breakpoint/watchpoint

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Currently, the debug-exceptions test always uses only
{break,watch}point#0 and the highest numbered context-aware
breakpoint. Modify the test to use all {break,watch}points and
context-aware breakpoints supported on the system.

Signed-off-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221020054202.2119018-10-reijiw@google.com
This commit is contained in:
Reiji Watanabe 2022-10-19 22:42:02 -07:00 committed by Marc Zyngier
parent 5ced4e533b
commit ebb8cc1031
1 changed files with 42 additions and 12 deletions
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54
tools/testing/selftests/kvm/aarch64/debug-exceptions.c
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@ -420,12 +420,11 @@ static int debug_version(uint64_t id_aa64dfr0)
return FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_DEBUGVER), id_aa64dfr0);
}
static void test_guest_debug_exceptions(uint64_t aa64dfr0)
static void test_guest_debug_exceptions(uint8_t bpn, uint8_t wpn, uint8_t ctx_bpn)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
struct ucall uc;
uint8_t brp_num;
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
ucall_init(vm, NULL);
@ -444,15 +443,9 @@ static void test_guest_debug_exceptions(uint64_t aa64dfr0)
vm_install_sync_handler(vm, VECTOR_SYNC_CURRENT,
ESR_EC_SVC64, guest_svc_handler);
/* Number of breakpoints */
brp_num = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_BRPS), aa64dfr0) + 1;
__TEST_REQUIRE(brp_num >= 2, "At least two breakpoints are required");
/*
* Run tests with breakpoint#0, watchpoint#0, and the higiest
* numbered (context-aware) breakpoint.
*/
vcpu_args_set(vcpu, 3, 0, 0, brp_num - 1);
/* Specify bpn/wpn/ctx_bpn to be tested */
vcpu_args_set(vcpu, 3, bpn, wpn, ctx_bpn);
pr_debug("Use bpn#%d, wpn#%d and ctx_bpn#%d\n", bpn, wpn, ctx_bpn);
vcpu_run(vcpu);
switch (get_ucall(vcpu, &uc)) {
@ -535,6 +528,43 @@ void test_single_step_from_userspace(int test_cnt)
kvm_vm_free(vm);
}
/*
* Run debug testing using the various breakpoint#, watchpoint# and
* context-aware breakpoint# with the given ID_AA64DFR0_EL1 configuration.
*/
void test_guest_debug_exceptions_all(uint64_t aa64dfr0)
{
uint8_t brp_num, wrp_num, ctx_brp_num, normal_brp_num, ctx_brp_base;
int b, w, c;
/* Number of breakpoints */
brp_num = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_BRPS), aa64dfr0) + 1;
__TEST_REQUIRE(brp_num >= 2, "At least two breakpoints are required");
/* Number of watchpoints */
wrp_num = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_WRPS), aa64dfr0) + 1;
/* Number of context aware breakpoints */
ctx_brp_num = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_CTX_CMPS), aa64dfr0) + 1;
pr_debug("%s brp_num:%d, wrp_num:%d, ctx_brp_num:%d\n", __func__,
brp_num, wrp_num, ctx_brp_num);
/* Number of normal (non-context aware) breakpoints */
normal_brp_num = brp_num - ctx_brp_num;
/* Lowest context aware breakpoint number */
ctx_brp_base = normal_brp_num;
/* Run tests with all supported breakpoints/watchpoints */
for (c = ctx_brp_base; c < ctx_brp_base + ctx_brp_num; c++) {
for (b = 0; b < normal_brp_num; b++) {
for (w = 0; w < wrp_num; w++)
test_guest_debug_exceptions(b, w, c);
}
}
}
static void help(char *name)
{
puts("");
@ -569,7 +599,7 @@ int main(int argc, char *argv[])
}
}
test_guest_debug_exceptions(aa64dfr0);
test_guest_debug_exceptions_all(aa64dfr0);
test_single_step_from_userspace(ss_iteration);
return 0;