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KVM: x86: Wire-up hardware breakpoints for guest debugging

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Add the remaining bits to make use of debug registers also for guest
debugging, thus enabling the use of hardware breakpoints and
watchpoints.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka
2008-12-15 13:52:10 +01:00
committed by Avi Kivity
parent 42dbaa5a05
commit ae675ef01c
3 changed files with 23 additions and 1 deletions
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14
arch/x86/kvm/x86.c
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@ -3861,10 +3861,22 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
struct kvm_guest_debug *dbg)
{
int r;
int i, r;
vcpu_load(vcpu);
if ((dbg->control & (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP)) ==
(KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP)) {
for (i = 0; i < KVM_NR_DB_REGS; ++i)
vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
vcpu->arch.switch_db_regs =
(dbg->arch.debugreg[7] & DR7_BP_EN_MASK);
} else {
for (i = 0; i < KVM_NR_DB_REGS; i++)
vcpu->arch.eff_db[i] = vcpu->arch.db[i];
vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
}
r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
if (dbg->control & KVM_GUESTDBG_INJECT_DB)