If we fail to handle a VMEXIT for some reason, print out a lot
more debugging information about the state of the GUEST VMCS
area. This does not fix a bug, but helps a lot when trying to
track down the cause of a VMEXIT/VMENTRY failure.
Signed-off-by: Chris Lalancette <clalance@xxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 38 ++++++++++++++++++++++++++++++++++++++
1 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 311afd4..37b1682 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3452,6 +3452,14 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
static const int kvm_vmx_max_exit_handlers =
ARRAY_SIZE(kvm_vmx_exit_handlers);
+#define PRINT_GUEST_SEGMENT(seg) do { \
+ printk(KERN_DEBUG #seg ": SELECTOR 0x%lx, BASE 0x%lx, LIMIT 0x%lx, AR 0x%lx\n", \
+ vmcs_readl(GUEST_##seg##_SELECTOR), \
+ vmcs_readl(GUEST_##seg##_BASE), \
+ vmcs_readl(GUEST_##seg##_LIMIT), \
+ vmcs_readl(GUEST_##seg##_AR_BYTES)); \
+ while(0)
+
/*
* The guest has exited. See if we can fix it or if we need userspace
* assistance.
@@ -3512,6 +3520,36 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
else {
vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
vcpu->run->hw.hardware_exit_reason = exit_reason;
+
+ printk(KERN_DEBUG "GUEST STATE:\n");
+ printk(KERN_DEBUG "CR0: 0x%lx\n", vmcs_readl(GUEST_CR0));
+ printk(KERN_DEBUG "CR3: 0x%lx\n", vmcs_readl(GUEST_CR3));
+ printk(KERN_DEBUG "CR4: 0x%lx\n", vmcs_readl(GUEST_CR4));
+ printk(KERN_DEBUG "VMENTRY CONTROL: 0x%lx\n",
+ vmcs_readl(VM_ENTRY_CONTROLS));
+ printk(KERN_DEBUG "DR7: 0x%lx\n", vmcs_readl(GUEST_DR7));
+ printk(KERN_DEBUG "SYSENTER ESP: 0x%lx\n",
+ vmcs_readl(GUEST_SYSENTER_ESP));
+ printk(KERN_DEBUG "SYSENTER EIP: 0x%lx\n",
+ vmcs_readl(GUEST_SYSENTER_EIP));
+
+ PRINT_GUEST_SEGMENT(CS);
+ PRINT_GUEST_SEGMENT(SS);
+ PRINT_GUEST_SEGMENT(DS);
+ PRINT_GUEST_SEGMENT(ES);
+ PRINT_GUEST_SEGMENT(FS);
+ PRINT_GUEST_SEGMENT(GS);
+ PRINT_GUEST_SEGMENT(TR);
+ PRINT_GUEST_SEGMENT(LDTR);
+
+ printk(KERN_DEBUG "GDTR: BASE 0x%lx, LIMIT 0x%lx",
+ vmcs_readl(GUEST_GDTR_BASE),
+ vmcs_readl(GUEST_GDTR_LIMIT));
+ printk(KERN_DEBUG "IDTR: BASE 0x%lx, LIMIT 0x%lx",
+ vmcs_readl(GUEST_IDTR_BASE),
+ vmcs_readl(GUEST_IDTR_LIMIT));
+ printk(KERN_DEBUG "RIP: 0x%lx\n",vmcs_readl(GUEST_RIP));
+ printk(KERN_DEBUG "RFLAGS: 0x%lx\n",vmcs_readl(GUEST_RFLAGS));
}
return 0;
}
--
1.6.0.6
--
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