Merge remote-tracking branch 'remotes/kvm/uq/master' into staging

* remotes/kvm/uq/master:
  qtest: fix vhost-user-test compilation with old GLib
  mc146818rtc: register the clock reset notifier on the right clock
  oslib-posix: Fix new compiler error with -Wclobbered
  target-i386: Add "kvmclock-stable-bit" feature bit name
  Enforce stack protector usage
  watchdog: fix deadlock with -watchdog-action pause
  mips_malta: Catch kernels linked at wrong address
  mips_malta: Remove incorrect KVM T&E references
  mips/kvm: Disable FPU on reset with KVM
  mips/kvm: Init EBase to correct KSEG0

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

configure

@@ -1489,18 +1489,25 @@ for flag in $gcc_flags; do
     fi
 done
 
-if test "$stack_protector" != "no" ; then
+if test "$stack_protector" != "no"; then
   gcc_flags="-fstack-protector-strong -fstack-protector-all"
+  sp_on=0
   for flag in $gcc_flags; do
     # We need to check both a compile and a link, since some compiler
     # setups fail only on a .c->.o compile and some only at link time
     if do_cc $QEMU_CFLAGS -Werror $flag -c -o $TMPO $TMPC &&
        compile_prog "-Werror $flag" ""; then
       QEMU_CFLAGS="$QEMU_CFLAGS $flag"
       LIBTOOLFLAGS="$LIBTOOLFLAGS -Wc,$flag"
+      sp_on=1
       break
     fi
   done
+  if test "$stack_protector" = yes; then
+    if test $sp_on = 0; then
+      error_exit "Stack protector not supported"
+    fi
+  fi
 fi
 
 # Workaround for http://gcc.gnu.org/PR55489.  Happens with -fPIE/-fPIC and

hw/mips/mips_malta.c

@@ -792,9 +792,23 @@ static int64_t load_kernel (void)
                 loaderparams.kernel_filename);
         exit(1);
     }
+
+    /* Sanity check where the kernel has been linked */
     if (kvm_enabled()) {
+        if (kernel_entry & 0x80000000ll) {
+            error_report("KVM guest kernels must be linked in useg. "
+                         "Did you forget to enable CONFIG_KVM_GUEST?");
+            exit(1);
+        }
+
         xlate_to_kseg0 = cpu_mips_kvm_um_phys_to_kseg0;
     } else {
+        if (!(kernel_entry & 0x80000000ll)) {
+            error_report("KVM guest kernels aren't supported with TCG. "
+                         "Did you unintentionally enable CONFIG_KVM_GUEST?");
+            exit(1);
+        }
+
         xlate_to_kseg0 = cpu_mips_phys_to_kseg0;
     }
 
@@ -1028,7 +1042,7 @@ void mips_malta_init(MachineState *machine)
     fl_idx++;
     if (kernel_filename) {
         ram_low_size = MIN(ram_size, 256 << 20);
-        /* For KVM T&E we reserve 1MB of RAM for running bootloader */
+        /* For KVM we reserve 1MB of RAM for running bootloader */
         if (kvm_enabled()) {
             ram_low_size -= 0x100000;
             bootloader_run_addr = 0x40000000 + ram_low_size;
@@ -1052,10 +1066,10 @@ void mips_malta_init(MachineState *machine)
                              bootloader_run_addr, kernel_entry);
         }
     } else {
-        /* The flash region isn't executable from a KVM T&E guest */
+        /* The flash region isn't executable from a KVM guest */
         if (kvm_enabled()) {
             error_report("KVM enabled but no -kernel argument was specified. "
-                         "Booting from flash is not supported with KVM T&E.");
+                         "Booting from flash is not supported with KVM.");
             exit(1);
         }
         /* Load firmware from flash. */

hw/timer/mc146818rtc.c

@@ -895,7 +895,7 @@ static void rtc_realizefn(DeviceState *dev, Error **errp)
     check_update_timer(s);
 
     s->clock_reset_notifier.notify = rtc_notify_clock_reset;
-    qemu_clock_register_reset_notifier(QEMU_CLOCK_REALTIME,
+    qemu_clock_register_reset_notifier(rtc_clock,
                                        &s->clock_reset_notifier);
 
     s->suspend_notifier.notify = rtc_notify_suspend;

hw/watchdog/watchdog.c

@@ -122,8 +122,12 @@ void watchdog_perform_action(void)
         exit(0);
 
     case WDT_PAUSE:             /* same as 'stop' command in monitor */
+        /* In a timer callback, when vm_stop calls qemu_clock_enable
+         * you would get a deadlock.  Bypass the problem.
+         */
+        qemu_system_vmstop_request_prepare();
         qapi_event_send_watchdog(WATCHDOG_EXPIRATION_ACTION_PAUSE, &error_abort);
-        vm_stop(RUN_STATE_WATCHDOG);
+        qemu_system_vmstop_request(RUN_STATE_WATCHDOG);
         break;
 
     case WDT_DEBUG:

target-i386/cpu.c

@@ -241,7 +241,7 @@ static const char *kvm_feature_name[] = {
     NULL, NULL, NULL, NULL,
     NULL, NULL, NULL, NULL,
     NULL, NULL, NULL, NULL,
-    NULL, NULL, NULL, NULL,
+    "kvmclock-stable-bit", NULL, NULL, NULL,
     NULL, NULL, NULL, NULL,
 };
 

target-mips/kvm.c

@@ -61,6 +61,13 @@ int kvm_arch_init_vcpu(CPUState *cs)
 
 void kvm_mips_reset_vcpu(MIPSCPU *cpu)
 {
+    CPUMIPSState *env = &cpu->env;
+
+    if (env->CP0_Config1 & (1 << CP0C1_FP)) {
+        fprintf(stderr, "Warning: FPU not supported with KVM, disabling\n");
+        env->CP0_Config1 &= ~(1 << CP0C1_FP);
+    }
+
     DPRINTF("%s\n", __func__);
 }
 

target-mips/translate.c

@@ -28,6 +28,7 @@
 
 #include "exec/helper-proto.h"
 #include "exec/helper-gen.h"
+#include "sysemu/kvm.h"
 
 #define MIPS_DEBUG_DISAS 0
 //#define MIPS_DEBUG_SIGN_EXTENSIONS
@@ -16076,7 +16077,12 @@ void cpu_state_reset(CPUMIPSState *env)
     env->CP0_Random = env->tlb->nb_tlb - 1;
     env->tlb->tlb_in_use = env->tlb->nb_tlb;
     env->CP0_Wired = 0;
-    env->CP0_EBase = 0x80000000 | (cs->cpu_index & 0x3FF);
+    env->CP0_EBase = (cs->cpu_index & 0x3FF);
+    if (kvm_enabled()) {
+        env->CP0_EBase |= 0x40000000;
+    } else {
+        env->CP0_EBase |= 0x80000000;
+    }
     env->CP0_Status = (1 << CP0St_BEV) | (1 << CP0St_ERL);
     /* vectored interrupts not implemented, timer on int 7,
        no performance counters. */

tests/vhost-user-test.c

@@ -22,6 +22,10 @@
 #include <qemu/sockets.h>
 
 /* GLIB version compatibility flags */
+#if !GLIB_CHECK_VERSION(2, 26, 0)
+#define G_TIME_SPAN_SECOND              (G_GINT64_CONSTANT(1000000))
+#endif
+
 #if GLIB_CHECK_VERSION(2, 28, 0)
 #define HAVE_MONOTONIC_TIME
 #endif

util/oslib-posix.c

@@ -366,10 +366,9 @@ static size_t fd_getpagesize(int fd)
 
 void os_mem_prealloc(int fd, char *area, size_t memory)
 {
-    int ret, i;
+    int ret;
     struct sigaction act, oldact;
     sigset_t set, oldset;
-    size_t hpagesize = fd_getpagesize(fd);
 
     memset(&act, 0, sizeof(act));
     act.sa_handler = &sigbus_handler;
@@ -389,19 +388,22 @@ void os_mem_prealloc(int fd, char *area, size_t memory)
     if (sigsetjmp(sigjump, 1)) {
         fprintf(stderr, "os_mem_prealloc: failed to preallocate pages\n");
         exit(1);
-    }
+    } else {
+        int i;
+        size_t hpagesize = fd_getpagesize(fd);
 
-    /* MAP_POPULATE silently ignores failures */
-    memory = (memory + hpagesize - 1) & -hpagesize;
-    for (i = 0; i < (memory/hpagesize); i++) {
-        memset(area + (hpagesize*i), 0, 1);
-    }
+        /* MAP_POPULATE silently ignores failures */
+        memory = (memory + hpagesize - 1) & -hpagesize;
+        for (i = 0; i < (memory / hpagesize); i++) {
+            memset(area + (hpagesize * i), 0, 1);
+        }
 
-    ret = sigaction(SIGBUS, &oldact, NULL);
-    if (ret) {
-        perror("os_mem_prealloc: failed to reinstall signal handler");
-        exit(1);
-    }
+        ret = sigaction(SIGBUS, &oldact, NULL);
+        if (ret) {
+            perror("os_mem_prealloc: failed to reinstall signal handler");
+            exit(1);
+        }
 
-    pthread_sigmask(SIG_SETMASK, &oldset, NULL);
+        pthread_sigmask(SIG_SETMASK, &oldset, NULL);
+    }
 }