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

* qemu-kvm/uq/master:
  kvmclock: guest stop notification
  kvm: update linux headers
  kvm: set gsi_bits and max_gsi correctly
  kvm: Drop unused kvm_pit_in_kernel
  kvm: allow arbitrarily sized mmio ioeventfd
  kvm: Drop redundant kvm_enabled from cpu_thread_is_idle
  kvm: add flightrecorder script

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;

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");
         }
     }

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;
+            }
+        }
     }
 }
 

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;
@@ -747,10 +741,10 @@ 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 +755,8 @@ 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();
     }
@@ -877,7 +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;
 
@@ -1642,14 +1636,15 @@ 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;
 

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;
@@ -120,7 +114,7 @@ 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;
 }

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);
 
@@ -210,7 +208,8 @@ 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

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 {

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

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;

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())