[PATCH 08/11] kvm, x86: unify sigbus handling

[Jin Dongming <jin.dongming@xxxxxxxxxxxxxxxxxx>]

Now kvm_handle_sigbus can handle both cases of SIGBUS.

Note that env is NULL when main thread receives SIGBUS via
signalfd, otherwise env points vcpu thread that receives SIGBUS.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx>
Tested-by: Jin Dongming <jin.dongming@xxxxxxxxxxxxxxxxxx>
---
 qemu-kvm.c |   94 +++++++++++++++++++++++++++---------------------------------
 1 files changed, 42 insertions(+), 52 deletions(-)

diff --git a/qemu-kvm.c b/qemu-kvm.c
index b58181a..16bc006 100644
--- a/qemu-kvm.c
+++ b/qemu-kvm.c
@@ -1219,10 +1219,12 @@ static void kvm_mce_inj_srao_broadcast(target_phys_addr_t paddr)
 }
 #endif
 
-static void kvm_handle_sigbus(int code, void *vaddr)
+static void kvm_handle_sigbus(CPUState *env, int code, void *vaddr)
 {
 #if defined(KVM_CAP_MCE) && defined(TARGET_I386)
-    if ((first_cpu->mcg_cap & MCG_SER_P) && vaddr && code == BUS_MCEERR_AO) {
+    /* env == NULL: when main thread received a SIGBUS */
+    if (!env && (first_cpu->mcg_cap & MCG_SER_P) && vaddr
+        && code == BUS_MCEERR_AO) {
         ram_addr_t ram_addr;
         target_phys_addr_t paddr;
 
@@ -1235,7 +1237,42 @@ static void kvm_handle_sigbus(int code, void *vaddr)
             return;
         }
         kvm_mce_inj_srao_broadcast(paddr);
-    } else
+        return;
+    }
+
+    /* env != NULL: when vcpu thread received a SIGBUS */
+    if (env && (env->mcg_cap & MCG_SER_P) && vaddr
+        && (code == BUS_MCEERR_AR || code == BUS_MCEERR_AO)) {
+        ram_addr_t ram_addr;
+        unsigned long paddr;
+
+        /*
+         * If there is an MCE excpetion being processed, ignore this SRAO MCE
+         */
+        if (code == BUS_MCEERR_AO && kvm_mce_in_progress(env)) {
+            return;
+        }
+
+        if (do_qemu_ram_addr_from_host(vaddr, &ram_addr) ||
+            !kvm_physical_memory_addr_from_ram(kvm_state, ram_addr, &paddr)) {
+            fprintf(stderr, "Hardware memory error for memory used by "
+                    "QEMU itself instaed of guest system!\n");
+            /* Hope we are lucky for AO MCE */
+            if (code == BUS_MCEERR_AO) {
+                return;
+            } else {
+                hardware_memory_error();
+            }
+        }
+        if (code == BUS_MCEERR_AR) {
+            /* Fake an Intel architectural Data Load SRAR UCR */
+            kvm_mce_inj_srar_dataload(env, paddr);
+        } else {
+            /* Fake an Intel architectural Memory scrubbing UCR */
+            kvm_mce_inj_srao_memscrub(env, paddr);
+        }
+        return;
+    }
 #endif
     {
         if (code == BUS_MCEERR_AO) {
@@ -1250,7 +1287,7 @@ static void kvm_handle_sigbus(int code, void *vaddr)
 
 static void sigbus_handler(int n, struct qemu_signalfd_siginfo *ssi, void *ctx)
 {
-    kvm_handle_sigbus(ssi->ssi_code, (void *)(intptr_t)ssi->ssi_addr);
+    kvm_handle_sigbus(NULL, ssi->ssi_code, (void *)(intptr_t)ssi->ssi_addr);
 }
 
 static void on_vcpu(CPUState *env, void (*func)(void *data), void *data)
@@ -1378,53 +1415,6 @@ static void flush_queued_work(CPUState *env)
     pthread_cond_broadcast(&qemu_work_cond);
 }
 
-static void kvm_on_sigbus(CPUState *env, int code, void *vaddr)
-{
-#if defined(KVM_CAP_MCE) && defined(TARGET_I386)
-    ram_addr_t ram_addr;
-    target_phys_addr_t paddr;
-
-    if ((env->mcg_cap & MCG_SER_P) && vaddr
-        && (code == BUS_MCEERR_AR || code == BUS_MCEERR_AO)) {
-
-        /*
-         * If there is an MCE excpetion being processed, ignore this SRAO MCE
-         */
-        if (code == BUS_MCEERR_AO && kvm_mce_in_progress(env)) }
-            return;
-        }
-
-        if (do_qemu_ram_addr_from_host(vaddr, &ram_addr) ||
-            !kvm_physical_memory_addr_from_ram(kvm_state, ram_addr, &paddr)) {
-            fprintf(stderr, "Hardware memory error for memory used by "
-                    "QEMU itself instead of guest system!\n");
-            /* Hope we are lucky for AO MCE */
-            if (code == BUS_MCEERR_AO) {
-                return;
-            } else {
-                hardware_memory_error();
-            }
-        }
-        if (code == BUS_MCEERR_AR) {
-            /* Fake an Intel architectural Data Load SRAR UCR */
-            kvm_mce_inj_srar_dataload(env, paddr);
-        } else {
-            /* Fake an Intel architectural Memory scrubbing UCR */
-            kvm_mce_inj_srao_memscrub(env, paddr);
-        }
-    } else
-#endif
-    {
-        if (code == BUS_MCEERR_AO) {
-            return;
-        } else if (code == BUS_MCEERR_AR) {
-            hardware_memory_error();
-        } else {
-            sigbus_reraise();
-        }
-    }
-}
-
 static void kvm_main_loop_wait(CPUState *env, int timeout)
 {
     struct timespec ts;
@@ -1454,7 +1444,7 @@ static void kvm_main_loop_wait(CPUState *env, int timeout)
 
         switch (r) {
         case SIGBUS:
-            kvm_on_sigbus(env, siginfo.si_code, (void *)siginfo.si_addr);
+            kvm_handle_sigbus(env, siginfo.si_code, (void *)siginfo.si_addr);
             break;
         default:
             break;
-- 
1.7.1.1


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