github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-28 01:55:51 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

KVM: selftests: Verify guest debug DR7.GD checking during instruction emulation

Browse Source 
Similar to the global disable test case in x86's debug_regs test, use
'KVM_FEP' to trigger instruction emulation in order to verify the guest
debug DR7.GD checking during instruction emulation.

Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
Link: https://patch.msgid.link/20260515222638.1949982-10-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Hou Wenlong 2026-05-15 15:26:37 -07:00 committed by Sean Christopherson
parent 35c08038cb
commit 063a22451f
1 changed files with 22 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
tools/testing/selftests/kvm/x86/debug_regs.c
View File

@ -19,6 +19,7 @@
u32 guest_value;
extern unsigned char sw_bp, hw_bp, write_data, ss_start, bd_start;
extern unsigned char fep_bd_start;
static void guest_code(void)
{
@ -64,6 +65,10 @@ static void guest_code(void)
/* DR6.BD test */
asm volatile("bd_start: mov %%dr0, %%rax" : : : "rax");
if (is_forced_emulation_enabled)
asm volatile(KVM_FEP "fep_bd_start: mov %%dr0, %%rax" : : : "rax");
GUEST_DONE();
}
@ -185,7 +190,7 @@ int main(void)
target_dr6);
}
/* Finally test global disable */
/* test global disable */
memset(&debug, 0, sizeof(debug));
debug.control = KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
debug.arch.debugreg[7] = 0x400 | DR7_GD;
@ -202,6 +207,22 @@ int main(void)
run->debug.arch.pc, target_rip, run->debug.arch.dr6,
target_dr6);
/* test global disable in emulation */
if (is_forced_emulation_enabled) {
/* Skip the 3-bytes "mov dr0" */
vcpu_skip_insn(vcpu, 3);
vcpu_run(vcpu);
TEST_ASSERT(run->exit_reason == KVM_EXIT_DEBUG &&
run->debug.arch.exception == DB_VECTOR &&
run->debug.arch.pc == CAST_TO_RIP(fep_bd_start) &&
run->debug.arch.dr6 == target_dr6,
"DR7.GD: exit %d exception %d rip 0x%llx "
"(should be 0x%llx) dr6 0x%llx (should be 0x%llx)",
run->exit_reason, run->debug.arch.exception,
run->debug.arch.pc, CAST_TO_RIP(fep_bd_start),
run->debug.arch.dr6, target_dr6);
}
/* Disable all debug controls, run to the end */
memset(&debug, 0, sizeof(debug));
vcpu_guest_debug_set(vcpu, &debug);