[PATCH 0/7] [PULL] qemu-kvm.git uq/master queue

[PATCH 0/7] [PULL] qemu-kvm.git uq/master queue

[Marcelo Tosatti]

The following changes since commit dadc1064c348545695b8a14d9dc72ccaa2983be7:

  target-microblaze: added PetaLogix copyright (2012-04-12 09:56:51 +0200)

are available in the git repository at:
  git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git uq/master

Eric B Munson (1):
      kvmclock: guest stop notification

Jan Kiszka (2):
      kvm: Drop redundant kvm_enabled from cpu_thread_is_idle
      kvm: Drop unused kvm_pit_in_kernel

Jason Baron (1):
      kvm: set gsi_bits and max_gsi correctly

Marcelo Tosatti (1):
      kvm: update linux headers

Michael S. Tsirkin (1):
      kvm: allow arbitrarily sized mmio ioeventfd

Stefan Hajnoczi (1):
      kvm: add flightrecorder script

 cpus.c                          |    3 +-
 hw/ivshmem.c                    |    8 +-
 hw/kvm/clock.c                  |   16 +++++
 kvm-all.c                       |   23 +++----
 kvm-stub.c                      |    8 +--
 kvm.h                           |    5 +-
 linux-headers/asm-powerpc/kvm.h |    1 +
 linux-headers/asm-s390/kvm.h    |    2 +
 linux-headers/linux/kvm.h       |    9 +++
 scripts/kvm/kvm_flightrecorder  |  126 +++++++++++++++++++++++++++++++++++++++
 10 files changed, 171 insertions(+), 30 deletions(-)
 create mode 100755 scripts/kvm/kvm_flightrecorder

[PATCH 1/7] kvm: add flightrecorder script

[Marcelo Tosatti]

From: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

The kvm kernel module includes a number of trace events which can be
useful when debugging system behavior.  Even on production systems these
trace events can be used to observe guest behavior and identify the
source of problems.

The kvm_flightrecorder script is a command-line wrapper for the
/sys/kernel/debug/tracing interface.  Kernel symbols do not need to be
installed.

This script captures a fixed-size buffer of KVM trace events.  Recent
events overwrite the oldest events when the buffer size is exceeded and
it is possible to leave KVM tracing enabled for any period of time with
just a fixed-size buffer.  If the buffer is large enough this script is
a useful tool for collecting detailed information after an issue occurs
with a guest.  Hence the name "flight recorder".

The script can also be used in 'tail' mode to simply view KVM trace
events as they occur.  This is handy for development and to ensure that
the guest is indeed running.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
 scripts/kvm/kvm_flightrecorder |  126 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 126 insertions(+), 0 deletions(-)
 create mode 100755 scripts/kvm/kvm_flightrecorder

diff --git a/scripts/kvm/kvm_flightrecorder b/scripts/kvm/kvm_flightrecorder
new file mode 100755
index 0000000..7fb1c2d
--- /dev/null
+++ b/scripts/kvm/kvm_flightrecorder
@@ -0,0 +1,126 @@
+#!/usr/bin/env python
+#
+# KVM Flight Recorder - ring buffer tracing script
+#
+# Copyright (C) 2012 IBM Corp
+#
+# Author: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
+#
+# This script provides a command-line interface to kvm ftrace and is designed
+# to be used as a flight recorder that is always running.  To start in-memory
+# recording:
+#
+# sudo kvm_flightrecorder start 8192  # 8 MB per-cpu ring buffers
+#
+# The per-cpu ring buffer size can be given in KB as an optional argument to
+# the 'start' subcommand.
+#
+# To stop the flight recorder:
+#
+# sudo kvm_flightrecorder stop
+#
+# To dump the contents of the flight recorder (this can be done when the
+# recorder is stopped or while it is running):
+#
+# sudo kvm_flightrecorder dump >/path/to/dump.txt
+#
+# To observe the trace while it is running, use the 'tail' subcommand:
+#
+# sudo kvm_flightrecorder tail
+#
+# Note that the flight recorder may impact overall system performance by
+# consuming CPU cycles.  No disk I/O is performed since the ring buffer holds a
+# fixed-size in-memory trace.
+
+import sys
+import os
+
+tracing_dir = '/sys/kernel/debug/tracing'
+
+def trace_path(*args):
+    return os.path.join(tracing_dir, *args)
+
+def write_file(path, data):
+    open(path, 'wb').write(data)
+
+def enable_event(subsystem, event, enable):
+    write_file(trace_path('events', subsystem, event, 'enable'), '1' if enable else '0')
+
+def enable_subsystem(subsystem, enable):
+    write_file(trace_path('events', subsystem, 'enable'), '1' if enable else '0')
+
+def start_tracing():
+    enable_subsystem('kvm', True)
+    write_file(trace_path('tracing_on'), '1')
+
+def stop_tracing():
+    write_file(trace_path('tracing_on'), '0')
+    enable_subsystem('kvm', False)
+    write_file(trace_path('events', 'enable'), '0')
+    write_file(trace_path('current_tracer'), 'nop')
+
+def dump_trace():
+    tracefile = open(trace_path('trace'), 'r')
+    try:
+        lines = True
+        while lines:
+            lines = tracefile.readlines(64 * 1024)
+            sys.stdout.writelines(lines)
+    except KeyboardInterrupt:
+        pass
+
+def tail_trace():
+    try:
+        for line in open(trace_path('trace_pipe'), 'r'):
+            sys.stdout.write(line)
+    except KeyboardInterrupt:
+        pass
+
+def usage():
+    print 'Usage: %s start [buffer_size_kb] | stop | dump | tail' % sys.argv[0]
+    print 'Control the KVM flight recorder tracing.'
+    sys.exit(0)
+
+def main():
+    if len(sys.argv) < 2:
+        usage()
+
+    cmd = sys.argv[1]
+    if cmd == '--version':
+        print 'kvm_flightrecorder version 1.0'
+        sys.exit(0)
+
+    if not os.path.isdir(tracing_dir):
+        print 'Unable to tracing debugfs directory, try:'
+        print 'mount -t debugfs none /sys/kernel/debug'
+        sys.exit(1)
+    if not os.access(tracing_dir, os.W_OK):
+        print 'Unable to write to tracing debugfs directory, please run as root'
+        sys.exit(1)
+
+    if cmd == 'start':
+        stop_tracing() # clean up first
+
+        if len(sys.argv) == 3:
+            try:
+                buffer_size_kb = int(sys.argv[2])
+            except ValueError:
+                print 'Invalid per-cpu trace buffer size in KB'
+                sys.exit(1)
+            write_file(trace_path('buffer_size_kb'), str(buffer_size_kb))
+            print 'Per-CPU ring buffer size set to %d KB' % buffer_size_kb
+
+        start_tracing()
+        print 'KVM flight recorder enabled'
+    elif cmd == 'stop':
+        stop_tracing()
+        print 'KVM flight recorder disabled'
+    elif cmd == 'dump':
+        dump_trace()
+    elif cmd == 'tail':
+        tail_trace()
+    else:
+        usage()
+
+if __name__ == '__main__':
+    sys.exit(main())
-- 
1.7.6.4

[PATCH 2/7] kvm: Drop redundant kvm_enabled from cpu_thread_is_idle

[Marcelo Tosatti]

From: Jan Kiszka <jan.kiszka@siemens.com>

This is now implied by kvm_irqchip_in_kernel.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
 cpus.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/cpus.c b/cpus.c
index eb22bd5..b182b3d 100644
--- a/cpus.c
+++ b/cpus.c
@@ -441,8 +441,7 @@ static bool cpu_thread_is_idle(CPUArchState *env)
     if (env->stopped || !runstate_is_running()) {
         return true;
     }
-    if (!env->halted || qemu_cpu_has_work(env) ||
-        (kvm_enabled() && kvm_irqchip_in_kernel())) {
+    if (!env->halted || qemu_cpu_has_work(env) || kvm_irqchip_in_kernel()) {
         return false;
     }
     return true;
-- 
1.7.6.4

[PATCH 3/7] kvm: allow arbitrarily sized mmio ioeventfd

[Marcelo Tosatti]

From: "Michael S. Tsirkin" <mst@redhat.com>

We use a 2 byte ioeventfd for virtio memory,
add support for this.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Amos Kong <akong@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
 hw/ivshmem.c |    8 ++++----
 kvm-all.c    |   15 ++++++++-------
 kvm-stub.c   |    2 +-
 kvm.h        |    3 ++-
 4 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/hw/ivshmem.c b/hw/ivshmem.c
index b80aa8f..df4f50a 100644
--- a/hw/ivshmem.c
+++ b/hw/ivshmem.c
@@ -354,8 +354,8 @@ static void close_guest_eventfds(IVShmemState *s, int posn)
     guest_curr_max = s->peers[posn].nb_eventfds;
 
     for (i = 0; i < guest_curr_max; i++) {
-        kvm_set_ioeventfd_mmio_long(s->peers[posn].eventfds[i],
-                    s->mmio_addr + DOORBELL, (posn << 16) | i, 0);
+        kvm_set_ioeventfd_mmio(s->peers[posn].eventfds[i],
+                    s->mmio_addr + DOORBELL, (posn << 16) | i, 0, 4);
         close(s->peers[posn].eventfds[i]);
     }
 
@@ -500,8 +500,8 @@ static void ivshmem_read(void *opaque, const uint8_t * buf, int flags)
     }
 
     if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
-        if (kvm_set_ioeventfd_mmio_long(incoming_fd, s->mmio_addr + DOORBELL,
-                        (incoming_posn << 16) | guest_max_eventfd, 1) < 0) {
+        if (kvm_set_ioeventfd_mmio(incoming_fd, s->mmio_addr + DOORBELL,
+                        (incoming_posn << 16) | guest_max_eventfd, 1, 4) < 0) {
             fprintf(stderr, "ivshmem: ioeventfd not available\n");
         }
     }
diff --git a/kvm-all.c b/kvm-all.c
index ba2cee1..f1cb69f 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -747,10 +747,10 @@ static void kvm_mem_ioeventfd_add(MemoryRegionSection *section,
 {
     int r;
 
-    assert(match_data && section->size == 4);
+    assert(match_data && section->size <= 8);
 
-    r = kvm_set_ioeventfd_mmio_long(fd, section->offset_within_address_space,
-                                    data, true);
+    r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
+                               data, true, section->size);
     if (r < 0) {
         abort();
     }
@@ -761,8 +761,8 @@ static void kvm_mem_ioeventfd_del(MemoryRegionSection *section,
 {
     int r;
 
-    r = kvm_set_ioeventfd_mmio_long(fd, section->offset_within_address_space,
-                                    data, false);
+    r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
+                               data, false, section->size);
     if (r < 0) {
         abort();
     }
@@ -1642,14 +1642,15 @@ int kvm_set_signal_mask(CPUArchState *env, const sigset_t *sigset)
     return r;
 }
 
-int kvm_set_ioeventfd_mmio_long(int fd, uint32_t addr, uint32_t val, bool assign)
+int kvm_set_ioeventfd_mmio(int fd, uint32_t addr, uint32_t val, bool assign,
+                           uint32_t size)
 {
     int ret;
     struct kvm_ioeventfd iofd;
 
     iofd.datamatch = val;
     iofd.addr = addr;
-    iofd.len = 4;
+    iofd.len = size;
     iofd.flags = KVM_IOEVENTFD_FLAG_DATAMATCH;
     iofd.fd = fd;
 
diff --git a/kvm-stub.c b/kvm-stub.c
index 69a1228..0d426db 100644
--- a/kvm-stub.c
+++ b/kvm-stub.c
@@ -120,7 +120,7 @@ int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign)
     return -ENOSYS;
 }
 
-int kvm_set_ioeventfd_mmio_long(int fd, uint32_t adr, uint32_t val, bool assign)
+int kvm_set_ioeventfd_mmio(int fd, uint32_t adr, uint32_t val, bool assign, uint32_t len)
 {
     return -ENOSYS;
 }
diff --git a/kvm.h b/kvm.h
index 330f17b..9bdbdb0 100644
--- a/kvm.h
+++ b/kvm.h
@@ -210,7 +210,8 @@ int kvm_physical_memory_addr_from_host(KVMState *s, void *ram_addr,
 #endif
 
 #endif
-int kvm_set_ioeventfd_mmio_long(int fd, uint32_t adr, uint32_t val, bool assign);
+int kvm_set_ioeventfd_mmio(int fd, uint32_t adr, uint32_t val, bool assign,
+                           uint32_t size);
 
 int kvm_set_ioeventfd_pio_word(int fd, uint16_t adr, uint16_t val, bool assign);
 #endif
-- 
1.7.6.4

[PATCH 4/7] kvm: Drop unused kvm_pit_in_kernel

[Marcelo Tosatti]

From: Jan Kiszka <jan.kiszka@siemens.com>

This is now implied by kvm_irqchip_in_kernel.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
 kvm-all.c  |    6 ------
 kvm-stub.c |    6 ------
 kvm.h      |    2 --
 3 files changed, 0 insertions(+), 14 deletions(-)

diff --git a/kvm-all.c b/kvm-all.c
index f1cb69f..5ff954a 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -75,7 +75,6 @@ struct KVMState
 #ifdef KVM_CAP_SET_GUEST_DEBUG
     struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
 #endif
-    int pit_in_kernel;
     int pit_state2;
     int xsave, xcrs;
     int many_ioeventfds;
@@ -198,11 +197,6 @@ static void kvm_reset_vcpu(void *opaque)
     kvm_arch_reset_vcpu(env);
 }
 
-int kvm_pit_in_kernel(void)
-{
-    return kvm_state->pit_in_kernel;
-}
-
 int kvm_init_vcpu(CPUArchState *env)
 {
     KVMState *s = kvm_state;
diff --git a/kvm-stub.c b/kvm-stub.c
index 0d426db..47c573d 100644
--- a/kvm-stub.c
+++ b/kvm-stub.c
@@ -16,12 +16,6 @@
 #include "gdbstub.h"
 #include "kvm.h"
 
-int kvm_pit_in_kernel(void)
-{
-    return 0;
-}
-
-
 int kvm_init_vcpu(CPUArchState *env)
 {
     return -ENOSYS;
diff --git a/kvm.h b/kvm.h
index 9bdbdb0..4ccae8c 100644
--- a/kvm.h
+++ b/kvm.h
@@ -83,8 +83,6 @@ int kvm_update_guest_debug(CPUArchState *env, unsigned long reinject_trap);
 int kvm_set_signal_mask(CPUArchState *env, const sigset_t *sigset);
 #endif
 
-int kvm_pit_in_kernel(void);
-
 int kvm_on_sigbus_vcpu(CPUArchState *env, int code, void *addr);
 int kvm_on_sigbus(int code, void *addr);
 
-- 
1.7.6.4

[PATCH 5/7] kvm: set gsi_bits and max_gsi correctly

[Marcelo Tosatti]

From: Jason Baron <jbaron@redhat.com>

The current kvm_init_irq_routing() doesn't set up the used_gsi_bitmap
correctly, and as a consequence pins max_gsi to 32 when it really
should be 1024. I ran into this limitation while testing pci
passthrough, where I consistently got an -ENOSPC return from
kvm_get_irq_route_gsi() called from assigned_dev_update_msix_mmio().

Signed-off-by: Jason Baron <jbaron@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
 kvm-all.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kvm-all.c b/kvm-all.c
index 5ff954a..b8e9dc6 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -871,7 +871,7 @@ static void kvm_init_irq_routing(KVMState *s)
         unsigned int gsi_bits, i;
 
         /* Round up so we can search ints using ffs */
-        gsi_bits = (gsi_count + 31) / 32;
+        gsi_bits = ALIGN(gsi_count, 32);
         s->used_gsi_bitmap = g_malloc0(gsi_bits / 8);
         s->max_gsi = gsi_bits;
 
-- 
1.7.6.4

[PATCH 6/7] kvm: update linux headers

[Marcelo Tosatti]

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
 linux-headers/asm-powerpc/kvm.h |    1 +
 linux-headers/asm-s390/kvm.h    |    2 ++
 linux-headers/linux/kvm.h       |    9 +++++++++
 3 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/linux-headers/asm-powerpc/kvm.h b/linux-headers/asm-powerpc/kvm.h
index b921c3f..1bea4d8 100644
--- a/linux-headers/asm-powerpc/kvm.h
+++ b/linux-headers/asm-powerpc/kvm.h
@@ -277,6 +277,7 @@ struct kvm_sync_regs {
 #define KVM_CPU_E500V2		2
 #define KVM_CPU_3S_32		3
 #define KVM_CPU_3S_64		4
+#define KVM_CPU_E500MC		5
 
 /* for KVM_CAP_SPAPR_TCE */
 struct kvm_create_spapr_tce {
diff --git a/linux-headers/asm-s390/kvm.h b/linux-headers/asm-s390/kvm.h
index 9acbde4..9607667 100644
--- a/linux-headers/asm-s390/kvm.h
+++ b/linux-headers/asm-s390/kvm.h
@@ -44,10 +44,12 @@ struct kvm_guest_debug_arch {
 #define KVM_SYNC_PREFIX (1UL << 0)
 #define KVM_SYNC_GPRS   (1UL << 1)
 #define KVM_SYNC_ACRS   (1UL << 2)
+#define KVM_SYNC_CRS    (1UL << 3)
 /* definition of registers in kvm_run */
 struct kvm_sync_regs {
 	__u64 prefix;	/* prefix register */
 	__u64 gprs[16];	/* general purpose registers */
 	__u32 acrs[16];	/* access registers */
+	__u64 crs[16];	/* control registers */
 };
 #endif
diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
index f6b5343..ee7bd9c 100644
--- a/linux-headers/linux/kvm.h
+++ b/linux-headers/linux/kvm.h
@@ -588,6 +588,8 @@ struct kvm_ppc_pvinfo {
 #define KVM_CAP_TSC_DEADLINE_TIMER 72
 #define KVM_CAP_S390_UCONTROL 73
 #define KVM_CAP_SYNC_REGS 74
+#define KVM_CAP_PCI_2_3 75
+#define KVM_CAP_KVMCLOCK_CTRL 76
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
@@ -784,6 +786,9 @@ struct kvm_s390_ucas_mapping {
 /* Available with KVM_CAP_TSC_CONTROL */
 #define KVM_SET_TSC_KHZ           _IO(KVMIO,  0xa2)
 #define KVM_GET_TSC_KHZ           _IO(KVMIO,  0xa3)
+/* Available with KVM_CAP_PCI_2_3 */
+#define KVM_ASSIGN_SET_INTX_MASK  _IOW(KVMIO,  0xa4, \
+				       struct kvm_assigned_pci_dev)
 
 /*
  * ioctls for vcpu fds
@@ -855,8 +860,12 @@ struct kvm_s390_ucas_mapping {
 /* Available with KVM_CAP_ONE_REG */
 #define KVM_GET_ONE_REG		  _IOW(KVMIO,  0xab, struct kvm_one_reg)
 #define KVM_SET_ONE_REG		  _IOW(KVMIO,  0xac, struct kvm_one_reg)
+/* VM is being stopped by host */
+#define KVM_KVMCLOCK_CTRL	  _IO(KVMIO,   0xad)
 
 #define KVM_DEV_ASSIGN_ENABLE_IOMMU	(1 << 0)
+#define KVM_DEV_ASSIGN_PCI_2_3		(1 << 1)
+#define KVM_DEV_ASSIGN_MASK_INTX	(1 << 2)
 
 struct kvm_assigned_pci_dev {
 	__u32 assigned_dev_id;
-- 
1.7.6.4

[PATCH 7/7] kvmclock: guest stop notification

[Marcelo Tosatti]

From: Eric B Munson <emunson@mgebm.net>

Often when a guest is stopped from the qemu console, it will report spurious
soft lockup warnings on resume.  There are kernel patches being discussed that
will give the host the ability to tell the guest that it is being stopped and
should ignore the soft lockup warning that generates.  This patch uses the qemu
Notifier system to tell the guest it is about to be stopped.

Signed-off-by: Eric B Munson <emunson@mgebm.net>
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
 hw/kvm/clock.c |   16 ++++++++++++++++
 1 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/hw/kvm/clock.c b/hw/kvm/clock.c
index 446bd62..824b978 100644
--- a/hw/kvm/clock.c
+++ b/hw/kvm/clock.c
@@ -65,9 +65,25 @@ static void kvmclock_vm_state_change(void *opaque, int running,
                                      RunState state)
 {
     KVMClockState *s = opaque;
+    CPUArchState *penv = first_cpu;
+    int cap_clock_ctrl = kvm_check_extension(kvm_state, KVM_CAP_KVMCLOCK_CTRL);
+    int ret;
 
     if (running) {
         s->clock_valid = false;
+
+        if (!cap_clock_ctrl) {
+            return;
+        }
+        for (penv = first_cpu; penv != NULL; penv = penv->next_cpu) {
+            ret = kvm_vcpu_ioctl(penv, KVM_KVMCLOCK_CTRL, 0);
+            if (ret) {
+                if (ret != -EINVAL) {
+                    fprintf(stderr, "%s: %s\n", __func__, strerror(-ret));
+                }
+                return;
+            }
+        }
     }
 }
 
-- 
1.7.6.4

Re: [Qemu-devel] [PATCH 0/7] [PULL] qemu-kvm.git uq/master queue

[Anthony Liguori]

On 04/12/2012 08:32 PM, Marcelo Tosatti wrote:
> The following changes since commit dadc1064c348545695b8a14d9dc72ccaa2983be7:
>
>    target-microblaze: added PetaLogix copyright (2012-04-12 09:56:51 +0200)
>
> are available in the git repository at:
>    git://git.kernel.org/pub/scm/virt/kvm/qemu-kvm.git uq/master

Pulled.  Thanks.

Regards,

Anthony Liguori

>
> Eric B Munson (1):
>        kvmclock: guest stop notification
>
> Jan Kiszka (2):
>        kvm: Drop redundant kvm_enabled from cpu_thread_is_idle
>        kvm: Drop unused kvm_pit_in_kernel
>
> Jason Baron (1):
>        kvm: set gsi_bits and max_gsi correctly
>
> Marcelo Tosatti (1):
>        kvm: update linux headers
>
> Michael S. Tsirkin (1):
>        kvm: allow arbitrarily sized mmio ioeventfd
>
> Stefan Hajnoczi (1):
>        kvm: add flightrecorder script
>
>   cpus.c                          |    3 +-
>   hw/ivshmem.c                    |    8 +-
>   hw/kvm/clock.c                  |   16 +++++
>   kvm-all.c                       |   23 +++----
>   kvm-stub.c                      |    8 +--
>   kvm.h                           |    5 +-
>   linux-headers/asm-powerpc/kvm.h |    1 +
>   linux-headers/asm-s390/kvm.h    |    2 +
>   linux-headers/linux/kvm.h       |    9 +++
>   scripts/kvm/kvm_flightrecorder  |  126 +++++++++++++++++++++++++++++++++++++++
>   10 files changed, 171 insertions(+), 30 deletions(-)
>   create mode 100755 scripts/kvm/kvm_flightrecorder
>
>