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Subject[PATCH 16/40] KVM: x86: Wire-up hardware breakpoints for guest debugging
Date
From: Jan Kiszka <jan.kiszka@siemens.com>

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>
---
arch/x86/kvm/svm.c | 5 +++++
arch/x86/kvm/vmx.c | 5 +++++
arch/x86/kvm/x86.c | 14 +++++++++++++-
3 files changed, 23 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 815f50e..b3a7a31 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 0989776..cee81c9 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 300bc4d..2477e87 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)
--
1.6.0.6


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