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Diffstat (limited to 'tools/testing/selftests/kvm/x86_64/debug_regs.c')
-rw-r--r--tools/testing/selftests/kvm/x86_64/debug_regs.c104
1 files changed, 58 insertions, 46 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/debug_regs.c b/tools/testing/selftests/kvm/x86_64/debug_regs.c
index 2fc6b3af81a1..f6b295e0b2d2 100644
--- a/tools/testing/selftests/kvm/x86_64/debug_regs.c
+++ b/tools/testing/selftests/kvm/x86_64/debug_regs.c
@@ -8,12 +8,13 @@
#include <string.h>
#include "kvm_util.h"
#include "processor.h"
-
-#define VCPU_ID 0
+#include "apic.h"
#define DR6_BD (1 << 13)
#define DR7_GD (1 << 13)
+#define IRQ_VECTOR 0xAA
+
/* For testing data access debug BP */
uint32_t guest_value;
@@ -21,6 +22,11 @@ extern unsigned char sw_bp, hw_bp, write_data, ss_start, bd_start;
static void guest_code(void)
{
+ /* Create a pending interrupt on current vCPU */
+ x2apic_enable();
+ x2apic_write_reg(APIC_ICR, APIC_DEST_SELF | APIC_INT_ASSERT |
+ APIC_DM_FIXED | IRQ_VECTOR);
+
/*
* Software BP tests.
*
@@ -38,12 +44,19 @@ static void guest_code(void)
"mov %%rax,%0;\n\t write_data:"
: "=m" (guest_value) : : "rax");
- /* Single step test, covers 2 basic instructions and 2 emulated */
+ /*
+ * Single step test, covers 2 basic instructions and 2 emulated
+ *
+ * Enable interrupts during the single stepping to see that
+ * pending interrupt we raised is not handled due to KVM_GUESTDBG_BLOCKIRQ
+ */
asm volatile("ss_start: "
+ "sti\n\t"
"xor %%eax,%%eax\n\t"
"cpuid\n\t"
"movl $0x1a0,%%ecx\n\t"
"rdmsr\n\t"
+ "cli\n\t"
: : : "eax", "ebx", "ecx", "edx");
/* DR6.BD test */
@@ -51,64 +64,63 @@ static void guest_code(void)
GUEST_DONE();
}
-#define CLEAR_DEBUG() memset(&debug, 0, sizeof(debug))
-#define APPLY_DEBUG() vcpu_set_guest_debug(vm, VCPU_ID, &debug)
#define CAST_TO_RIP(v) ((unsigned long long)&(v))
-#define SET_RIP(v) do { \
- vcpu_regs_get(vm, VCPU_ID, &regs); \
- regs.rip = (v); \
- vcpu_regs_set(vm, VCPU_ID, &regs); \
- } while (0)
-#define MOVE_RIP(v) SET_RIP(regs.rip + (v));
+
+static void vcpu_skip_insn(struct kvm_vcpu *vcpu, int insn_len)
+{
+ struct kvm_regs regs;
+
+ vcpu_regs_get(vcpu, &regs);
+ regs.rip += insn_len;
+ vcpu_regs_set(vcpu, &regs);
+}
int main(void)
{
struct kvm_guest_debug debug;
unsigned long long target_dr6, target_rip;
- struct kvm_regs regs;
+ struct kvm_vcpu *vcpu;
struct kvm_run *run;
struct kvm_vm *vm;
struct ucall uc;
uint64_t cmd;
int i;
/* Instruction lengths starting at ss_start */
- int ss_size[4] = {
+ int ss_size[6] = {
+ 1, /* sti*/
2, /* xor */
2, /* cpuid */
5, /* mov */
2, /* rdmsr */
+ 1, /* cli */
};
- if (!kvm_check_cap(KVM_CAP_SET_GUEST_DEBUG)) {
- print_skip("KVM_CAP_SET_GUEST_DEBUG not supported");
- return 0;
- }
+ TEST_REQUIRE(kvm_has_cap(KVM_CAP_SET_GUEST_DEBUG));
- vm = vm_create_default(VCPU_ID, 0, guest_code);
- vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
- run = vcpu_state(vm, VCPU_ID);
+ vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+ run = vcpu->run;
/* Test software BPs - int3 */
- CLEAR_DEBUG();
+ memset(&debug, 0, sizeof(debug));
debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
- APPLY_DEBUG();
- vcpu_run(vm, VCPU_ID);
+ vcpu_guest_debug_set(vcpu, &debug);
+ vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == BP_VECTOR &&
run->debug.arch.pc == CAST_TO_RIP(sw_bp),
"INT3: exit %d exception %d rip 0x%llx (should be 0x%llx)",
run->exit_reason, run->debug.arch.exception,
run->debug.arch.pc, CAST_TO_RIP(sw_bp));
- MOVE_RIP(1);
+ vcpu_skip_insn(vcpu, 1);
/* Test instruction HW BP over DR[0-3] */
for (i = 0; i < 4; i++) {
- CLEAR_DEBUG();
+ memset(&debug, 0, sizeof(debug));
debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
debug.arch.debugreg[i] = CAST_TO_RIP(hw_bp);
debug.arch.debugreg[7] = 0x400 | (1UL << (2*i+1));
- APPLY_DEBUG();
- vcpu_run(vm, VCPU_ID);
+ vcpu_guest_debug_set(vcpu, &debug);
+ vcpu_run(vcpu);
target_dr6 = 0xffff0ff0 | (1UL << i);
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == DB_VECTOR &&
@@ -121,17 +133,17 @@ int main(void)
run->debug.arch.dr6, target_dr6);
}
/* Skip "nop" */
- MOVE_RIP(1);
+ vcpu_skip_insn(vcpu, 1);
/* Test data access HW BP over DR[0-3] */
for (i = 0; i < 4; i++) {
- CLEAR_DEBUG();
+ memset(&debug, 0, sizeof(debug));
debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
debug.arch.debugreg[i] = CAST_TO_RIP(guest_value);
debug.arch.debugreg[7] = 0x00000400 | (1UL << (2*i+1)) |
(0x000d0000UL << (4*i));
- APPLY_DEBUG();
- vcpu_run(vm, VCPU_ID);
+ vcpu_guest_debug_set(vcpu, &debug);
+ vcpu_run(vcpu);
target_dr6 = 0xffff0ff0 | (1UL << i);
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == DB_VECTOR &&
@@ -143,22 +155,22 @@ int main(void)
run->debug.arch.pc, CAST_TO_RIP(write_data),
run->debug.arch.dr6, target_dr6);
/* Rollback the 4-bytes "mov" */
- MOVE_RIP(-7);
+ vcpu_skip_insn(vcpu, -7);
}
/* Skip the 4-bytes "mov" */
- MOVE_RIP(7);
+ vcpu_skip_insn(vcpu, 7);
/* Test single step */
target_rip = CAST_TO_RIP(ss_start);
target_dr6 = 0xffff4ff0ULL;
- vcpu_regs_get(vm, VCPU_ID, &regs);
for (i = 0; i < (sizeof(ss_size) / sizeof(ss_size[0])); i++) {
target_rip += ss_size[i];
- CLEAR_DEBUG();
- debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
+ memset(&debug, 0, sizeof(debug));
+ debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP |
+ KVM_GUESTDBG_BLOCKIRQ;
debug.arch.debugreg[7] = 0x00000400;
- APPLY_DEBUG();
- vcpu_run(vm, VCPU_ID);
+ vcpu_guest_debug_set(vcpu, &debug);
+ vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == DB_VECTOR &&
run->debug.arch.pc == target_rip &&
@@ -171,11 +183,11 @@ int main(void)
}
/* Finally test global disable */
- CLEAR_DEBUG();
+ memset(&debug, 0, sizeof(debug));
debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
debug.arch.debugreg[7] = 0x400 | DR7_GD;
- APPLY_DEBUG();
- vcpu_run(vm, VCPU_ID);
+ vcpu_guest_debug_set(vcpu, &debug);
+ vcpu_run(vcpu);
target_dr6 = 0xffff0ff0 | DR6_BD;
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == DB_VECTOR &&
@@ -188,12 +200,12 @@ int main(void)
target_dr6);
/* Disable all debug controls, run to the end */
- CLEAR_DEBUG();
- APPLY_DEBUG();
+ memset(&debug, 0, sizeof(debug));
+ vcpu_guest_debug_set(vcpu, &debug);
- vcpu_run(vm, VCPU_ID);
- TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, "KVM_EXIT_IO");
- cmd = get_ucall(vm, VCPU_ID, &uc);
+ vcpu_run(vcpu);
+ TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
+ cmd = get_ucall(vcpu, &uc);
TEST_ASSERT(cmd == UCALL_DONE, "UCALL_DONE");
kvm_vm_free(vm);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.