In the x86's debug_regs test, add a test case to cover the scenario where single-step with STI in VMX sets the 'BS' bit in pending debug exceptions for #DB interception and instruction emulation in both cases.
Signed-off-by: Hou Wenlong houwenlong.hwl@antgroup.com --- .../selftests/kvm/include/x86/processor.h | 3 +- tools/testing/selftests/kvm/x86/debug_regs.c | 41 +++++++++++++++++-- 2 files changed, 40 insertions(+), 4 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/x86/processor.h b/tools/testing/selftests/kvm/include/x86/processor.h index 488d516c4f6f..f5827cca813e 100644 --- a/tools/testing/selftests/kvm/include/x86/processor.h +++ b/tools/testing/selftests/kvm/include/x86/processor.h @@ -34,7 +34,8 @@ extern uint64_t guest_tsc_khz;
#define NMI_VECTOR 0x02
-#define X86_EFLAGS_FIXED (1u << 1) +#define X86_EFLAGS_FIXED (1u << 1) +#define X86_EFLAGS_TF (1u << 8)
#define X86_CR4_VME (1ul << 0) #define X86_CR4_PVI (1ul << 1) diff --git a/tools/testing/selftests/kvm/x86/debug_regs.c b/tools/testing/selftests/kvm/x86/debug_regs.c index ba80b77c2869..60dea0116b21 100644 --- a/tools/testing/selftests/kvm/x86/debug_regs.c +++ b/tools/testing/selftests/kvm/x86/debug_regs.c @@ -15,11 +15,31 @@
#define IRQ_VECTOR 0xAA
+#define CAST_TO_RIP(v) ((unsigned long long)&(v)) + /* For testing data access debug BP */ uint32_t guest_value;
extern unsigned char sw_bp, hw_bp, write_data, ss_start, bd_start; -extern unsigned char fep_bd_start; +extern unsigned char fep_bd_start, fep_sti_start, fep_sti_end; + +static void guest_db_handler(struct ex_regs *regs) +{ + static int count; + unsigned long target_rips[2] = { + CAST_TO_RIP(fep_sti_start), + CAST_TO_RIP(fep_sti_end), + }; + + __GUEST_ASSERT(regs->rip == target_rips[count], "STI: unexpected rip 0x%lx (should be 0x%lx)", + regs->rip, target_rips[count]); + regs->rflags &= ~X86_EFLAGS_TF; + count++; +} + +static void guest_irq_handler(struct ex_regs *regs) +{ +}
static void guest_code(void) { @@ -69,13 +89,25 @@ static void guest_code(void) if (is_forced_emulation_enabled) { /* DR6.BD test for emulation */ asm volatile(KVM_FEP "fep_bd_start: mov %%dr0, %%rax" : : : "rax"); + + /* pending debug exceptions for emulation */ + asm volatile("pushf\n\t" + "orq $" __stringify(X86_EFLAGS_TF) ", (%rsp)\n\t" + "popf\n\t" + "sti\n\t" + "fep_sti_start:" + "cli\n\t" + "pushf\n\t" + "orq $" __stringify(X86_EFLAGS_TF) ", (%rsp)\n\t" + "popf\n\t" + KVM_FEP "sti\n\t" + "fep_sti_end:" + "cli\n\t"); }
GUEST_DONE(); }
-#define CAST_TO_RIP(v) ((unsigned long long)&(v)) - static void vcpu_skip_insn(struct kvm_vcpu *vcpu, int insn_len) { struct kvm_regs regs; @@ -110,6 +142,9 @@ int main(void) vm = vm_create_with_one_vcpu(&vcpu, guest_code); run = vcpu->run;
+ vm_install_exception_handler(vm, DB_VECTOR, guest_db_handler); + vm_install_exception_handler(vm, IRQ_VECTOR, guest_irq_handler); + /* Test software BPs - int3 */ memset(&debug, 0, sizeof(debug)); debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;