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authorJan Kiszka <jan.kiszka@siemens.com>2008-12-15 13:52:10 +0100
committerAvi Kivity <avi@redhat.com>2009-03-24 11:02:50 +0200
commitae675ef01cd86014acf8da5dee87876b71122495 (patch)
tree7e386de9eb17d6c3fb264aef8505128e5daaf0d9 /arch/x86/kvm
parent42dbaa5a057736bf8b5c22aa42dbe975bf1080e5 (diff)
KVM: x86: Wire-up hardware breakpoints for guest debugging
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>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/svm.c5
-rw-r--r--arch/x86/kvm/vmx.c5
-rw-r--r--arch/x86/kvm/x86.c14
3 files changed, 23 insertions, 1 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 815f50e425a..b3a7a314d55 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -958,6 +958,11 @@ static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
} else
vcpu->guest_debug = 0;
+ if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
+ svm->vmcb->save.dr7 = dbg->arch.debugreg[7];
+ else
+ svm->vmcb->save.dr7 = vcpu->arch.dr7;
+
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
svm->vmcb->save.rflags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
else if (old_debug & KVM_GUESTDBG_SINGLESTEP)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 0989776ee7b..cee81c9a665 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1017,6 +1017,11 @@ static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
vcpu->guest_debug = 0;
+ if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
+ vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
+ else
+ vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
+
flags = vmcs_readl(GUEST_RFLAGS);
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 300bc4d42ab..2477e87b2f8 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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)