This adds an arch field to kvm_run.debug, the payload that is returned
to user space on KVM_EXIT_DEBUG guest exits. For x86, this field is now
supposed to report the precise debug exception (#DB or #BP) and the
current state of the debug registers (the latter is not yet
implemented).
---
arch/x86/kvm/vmx.c | 1 +
include/asm-x86/kvm.h | 5 +++++
include/linux/kvm.h | 1 +
3 files changed, 7 insertions(+)
Index: b/arch/x86/kvm/vmx.c
===================================================================
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2282,6 +2282,7 @@ static int handle_exception(struct kvm_v
if ((intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK)) ==
(INTR_TYPE_EXCEPTION | 1)) {
kvm_run->exit_reason = KVM_EXIT_DEBUG;
+ kvm_run->debug.arch.exception = 1;
return 0;
}
kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
Index: b/include/asm-x86/kvm.h
===================================================================
--- a/include/asm-x86/kvm.h
+++ b/include/asm-x86/kvm.h
@@ -230,4 +230,9 @@ struct kvm_pit_state {
#define KVM_TRC_APIC_ACCESS (KVM_TRC_HANDLER + 0x14)
#define KVM_TRC_TDP_FAULT (KVM_TRC_HANDLER + 0x15)
+struct kvm_debug_exit_arch {
+ __u32 exception;
+ __u64 dr[8];
+};
+
#endif
Index: b/include/linux/kvm.h
===================================================================
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -125,6 +125,7 @@ struct kvm_run {
__u64 data_offset; /* relative to kvm_run start */
} io;
struct {
+ struct kvm_debug_exit_arch arch;
} debug;
/* KVM_EXIT_MMIO */
struct {
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