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Diffstat (limited to 'arch/x86/kvm/vmx.c')
-rw-r--r--arch/x86/kvm/vmx.c114
1 files changed, 98 insertions, 16 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index c776868ffe4..0989776ee7b 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2311,7 +2311,6 @@ static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
kvm_rip_write(vcpu, 0);
kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
- /* todo: dr0 = dr1 = dr2 = dr3 = 0; dr6 = 0xffff0ff0 */
vmcs_writel(GUEST_DR7, 0x400);
vmcs_writel(GUEST_GDTR_BASE, 0);
@@ -2577,7 +2576,7 @@ static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 intr_info, ex_no, error_code;
- unsigned long cr2, rip;
+ unsigned long cr2, rip, dr6;
u32 vect_info;
enum emulation_result er;
@@ -2637,14 +2636,28 @@ static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
}
ex_no = intr_info & INTR_INFO_VECTOR_MASK;
- if (ex_no == DB_VECTOR || ex_no == BP_VECTOR) {
+ switch (ex_no) {
+ case DB_VECTOR:
+ dr6 = vmcs_readl(EXIT_QUALIFICATION);
+ if (!(vcpu->guest_debug &
+ (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
+ vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
+ kvm_queue_exception(vcpu, DB_VECTOR);
+ return 1;
+ }
+ kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
+ kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
+ /* fall through */
+ case BP_VECTOR:
kvm_run->exit_reason = KVM_EXIT_DEBUG;
kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
kvm_run->debug.arch.exception = ex_no;
- } else {
+ break;
+ default:
kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
kvm_run->ex.exception = ex_no;
kvm_run->ex.error_code = error_code;
+ break;
}
return 0;
}
@@ -2784,21 +2797,44 @@ static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
unsigned long val;
int dr, reg;
- /*
- * FIXME: this code assumes the host is debugging the guest.
- * need to deal with guest debugging itself too.
- */
+ dr = vmcs_readl(GUEST_DR7);
+ if (dr & DR7_GD) {
+ /*
+ * As the vm-exit takes precedence over the debug trap, we
+ * need to emulate the latter, either for the host or the
+ * guest debugging itself.
+ */
+ if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
+ kvm_run->debug.arch.dr6 = vcpu->arch.dr6;
+ kvm_run->debug.arch.dr7 = dr;
+ kvm_run->debug.arch.pc =
+ vmcs_readl(GUEST_CS_BASE) +
+ vmcs_readl(GUEST_RIP);
+ kvm_run->debug.arch.exception = DB_VECTOR;
+ kvm_run->exit_reason = KVM_EXIT_DEBUG;
+ return 0;
+ } else {
+ vcpu->arch.dr7 &= ~DR7_GD;
+ vcpu->arch.dr6 |= DR6_BD;
+ vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
+ kvm_queue_exception(vcpu, DB_VECTOR);
+ return 1;
+ }
+ }
+
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
- dr = exit_qualification & 7;
- reg = (exit_qualification >> 8) & 15;
- if (exit_qualification & 16) {
- /* mov from dr */
+ dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
+ reg = DEBUG_REG_ACCESS_REG(exit_qualification);
+ if (exit_qualification & TYPE_MOV_FROM_DR) {
switch (dr) {
+ case 0 ... 3:
+ val = vcpu->arch.db[dr];
+ break;
case 6:
- val = 0xffff0ff0;
+ val = vcpu->arch.dr6;
break;
case 7:
- val = 0x400;
+ val = vcpu->arch.dr7;
break;
default:
val = 0;
@@ -2806,7 +2842,38 @@ static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
kvm_register_write(vcpu, reg, val);
KVMTRACE_2D(DR_READ, vcpu, (u32)dr, (u32)val, handler);
} else {
- /* mov to dr */
+ val = vcpu->arch.regs[reg];
+ switch (dr) {
+ case 0 ... 3:
+ vcpu->arch.db[dr] = val;
+ if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
+ vcpu->arch.eff_db[dr] = val;
+ break;
+ case 4 ... 5:
+ if (vcpu->arch.cr4 & X86_CR4_DE)
+ kvm_queue_exception(vcpu, UD_VECTOR);
+ break;
+ case 6:
+ if (val & 0xffffffff00000000ULL) {
+ kvm_queue_exception(vcpu, GP_VECTOR);
+ break;
+ }
+ vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
+ break;
+ case 7:
+ if (val & 0xffffffff00000000ULL) {
+ kvm_queue_exception(vcpu, GP_VECTOR);
+ break;
+ }
+ vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
+ if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
+ vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
+ vcpu->arch.switch_db_regs =
+ (val & DR7_BP_EN_MASK);
+ }
+ break;
+ }
+ KVMTRACE_2D(DR_WRITE, vcpu, (u32)dr, (u32)val, handler);
}
skip_emulated_instruction(vcpu);
return 1;
@@ -2957,7 +3024,18 @@ static int handle_task_switch(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
}
tss_selector = exit_qualification;
- return kvm_task_switch(vcpu, tss_selector, reason);
+ if (!kvm_task_switch(vcpu, tss_selector, reason))
+ return 0;
+
+ /* clear all local breakpoint enable flags */
+ vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);
+
+ /*
+ * TODO: What about debug traps on tss switch?
+ * Are we supposed to inject them and update dr6?
+ */
+
+ return 1;
}
static int handle_ept_violation(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
@@ -3342,6 +3420,8 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
*/
vmcs_writel(HOST_CR0, read_cr0());
+ set_debugreg(vcpu->arch.dr6, 6);
+
asm(
/* Store host registers */
"push %%"R"dx; push %%"R"bp;"
@@ -3436,6 +3516,8 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
vcpu->arch.regs_dirty = 0;
+ get_debugreg(vcpu->arch.dr6, 6);
+
vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
if (vmx->rmode.irq.pending)
fixup_rmode_irq(vmx);
generated by cgit v1.2.3 (git 2.25.1) at 2024-09-09 23:58:37 +0000