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authorAvi Kivity <avi@redhat.com>2009-11-04 11:54:59 +0200
committerAvi Kivity <avi@redhat.com>2009-12-03 09:32:24 +0200
commita9c7399d6cda0a092b347f8ee49bbe44f6e1fe66 (patch)
treea00b781aa1521efc387ae9b59875862cb37c1d3f
parentc54d2aba27f0c505d61700d656c5943e96982e60 (diff)
downloadop-kernel-dev-a9c7399d6cda0a092b347f8ee49bbe44f6e1fe66.zip
op-kernel-dev-a9c7399d6cda0a092b347f8ee49bbe44f6e1fe66.tar.gz
KVM: Allow internal errors reported to userspace to carry extra data
Usually userspace will freeze the guest so we can inspect it, but some internal state is not available. Add extra data to internal error reporting so we can expose it to the debugger. Extra data is specific to the suberror. Signed-off-by: Avi Kivity <avi@redhat.com>
-rw-r--r--arch/x86/kvm/mmu.c1
-rw-r--r--arch/x86/kvm/vmx.c1
-rw-r--r--include/linux/kvm.h4
-rw-r--r--virt/kvm/kvm_main.c1
4 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index a902479..4c3e5b2 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2800,6 +2800,7 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
case EMULATE_FAIL:
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
+ vcpu->run->internal.ndata = 0;
return 0;
default:
BUG();
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index c9cc959..c0e66dd 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3352,6 +3352,7 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
kvm_report_emulation_failure(vcpu, "emulation failure");
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
+ vcpu->run->internal.ndata = 0;
ret = 0;
goto out;
}
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index ca62b8e..172639e 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -251,6 +251,9 @@ struct kvm_run {
} dcr;
struct {
__u32 suberror;
+ /* Available with KVM_CAP_INTERNAL_ERROR_DATA: */
+ __u32 ndata;
+ __u64 data[16];
} internal;
/* Fix the size of the union. */
char padding[256];
@@ -484,6 +487,7 @@ struct kvm_ioeventfd {
#define KVM_CAP_XEN_HVM 38
#endif
#define KVM_CAP_ADJUST_CLOCK 39
+#define KVM_CAP_INTERNAL_ERROR_DATA 40
#ifdef KVM_CAP_IRQ_ROUTING
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index bd44fb4..f92ba13 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1653,6 +1653,7 @@ static long kvm_dev_ioctl_check_extension_generic(long arg)
#ifdef CONFIG_KVM_APIC_ARCHITECTURE
case KVM_CAP_SET_BOOT_CPU_ID:
#endif
+ case KVM_CAP_INTERNAL_ERROR_DATA:
return 1;
#ifdef CONFIG_HAVE_KVM_IRQCHIP
case KVM_CAP_IRQ_ROUTING:
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