Guest debugging support for KVM (Jan Kiszka)

This is a backport of the guest debugging support for the KVM
accelerator that is now part of the KVM tree. It implements the reworked
KVM kernel API for guest debugging (KVM_CAP_SET_GUEST_DEBUG) which is
not yet part of any mainline kernel but will probably be 2.6.30 stuff.
So far supported is x86, but PPC is expected to catch up soon.

Core features are:
 - unlimited soft-breakpoints via code patching
 - hardware-assisted x86 breakpoints and watchpoints

Changes in this version:
 - use generic hook cpu_synchronize_state to transfer registers between
   user space and kvm
 - push kvm_sw_breakpoints into KVMState

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6825 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 51 insertions, 0 deletions

diff --git a/kvm.h b/kvm.h
index efce1450d..0d6bf7e4c 100644
--- a/kvm.h
+++ b/kvm.h
@@ -15,6 +15,7 @@
 #define QEMU_KVM_H
 
 #include "config.h"
+#include "sys-queue.h"
 
 #ifdef CONFIG_KVM
 extern int kvm_allowed;
@@ -49,6 +50,13 @@ int kvm_has_sync_mmu(void);
 int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size);
 int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size);
 
+int kvm_insert_breakpoint(CPUState *current_env, target_ulong addr,
+                          target_ulong len, int type);
+int kvm_remove_breakpoint(CPUState *current_env, target_ulong addr,
+                          target_ulong len, int type);
+void kvm_remove_all_breakpoints(CPUState *current_env);
+int kvm_update_guest_debug(CPUState *env, unsigned long reinject_trap);
+
 /* internal API */
 
 struct KVMState;
@@ -76,4 +84,47 @@ int kvm_arch_init(KVMState *s, int smp_cpus);
 
 int kvm_arch_init_vcpu(CPUState *env);
 
+struct kvm_guest_debug;
+struct kvm_debug_exit_arch;
+
+struct kvm_sw_breakpoint {
+    target_ulong pc;
+    target_ulong saved_insn;
+    int use_count;
+    TAILQ_ENTRY(kvm_sw_breakpoint) entry;
+};
+
+TAILQ_HEAD(kvm_sw_breakpoint_head, kvm_sw_breakpoint);
+
+int kvm_arch_debug(struct kvm_debug_exit_arch *arch_info);
+
+struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *env,
+                                                 target_ulong pc);
+
+int kvm_sw_breakpoints_active(CPUState *env);
+
+int kvm_arch_insert_sw_breakpoint(CPUState *current_env,
+                                  struct kvm_sw_breakpoint *bp);
+int kvm_arch_remove_sw_breakpoint(CPUState *current_env,
+                                  struct kvm_sw_breakpoint *bp);
+int kvm_arch_insert_hw_breakpoint(target_ulong addr,
+                                  target_ulong len, int type);
+int kvm_arch_remove_hw_breakpoint(target_ulong addr,
+                                  target_ulong len, int type);
+void kvm_arch_remove_all_hw_breakpoints(void);
+
+void kvm_arch_update_guest_debug(CPUState *env, struct kvm_guest_debug *dbg);
+
+/* generic hooks - to be moved/refactored once there are more users */
+
+static inline void cpu_synchronize_state(CPUState *env, int modified)
+{
+    if (kvm_enabled()) {
+        if (modified)
+            kvm_arch_put_registers(env);
+        else
+            kvm_arch_get_registers(env);
+    }
+}
+
 #endif