[Qemu-devel] [PATCH 7/8] hmp: added io apic dump state

["Denis V. Lunev" <den@openvz.org>]

From: Pavel Butsykin <pbutsykin@virtuozzo.com>

Added the hmp command to query io apic state, may be usefull after guest
crashes to understand IRQ routing in guest.

Implementation is only for kvm here. The dump will look like
(qemu) info apic-io
ioapic ID=00 IRR=00000000 SEL=18
ioapic 00 00000000000100ff: int=ff delmod=0:Fixed  P.H.EM dest=0
ioapic 01 0300000000000993: int=93 delmod=1:LowPri L.H.E. dest=3
...
ioapic 23 00000000000100ff: int=ff delmod=0:Fixed  P.H.EM dest=0

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Luiz Capitulino <lcapitulino@redhat.com>
---
 hmp-commands.hx                   |  2 ++
 hw/i386/kvm/ioapic.c              | 10 ++++++++++
 hw/intc/ioapic_common.c           | 31 +++++++++++++++++++++++++++++++
 include/hw/i386/ioapic_internal.h |  2 ++
 include/hw/i386/pc.h              |  4 ++++
 monitor.c                         | 20 ++++++++++++++++++++
 6 files changed, 69 insertions(+)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 95f554e..894ff65 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1726,6 +1726,8 @@ show block device statistics
 show the cpu registers
 @item info apic-local
 show local APIC state
+@item info apic-io
+show io APIC state
 @item info cpus
 show infos for each CPU
 @item info history
diff --git a/hw/i386/kvm/ioapic.c b/hw/i386/kvm/ioapic.c
index d2a6c4c..b7390ca 100644
--- a/hw/i386/kvm/ioapic.c
+++ b/hw/i386/kvm/ioapic.c
@@ -10,6 +10,7 @@
  * See the COPYING file in the top-level directory.
  */
 
+#include "monitor/monitor.h"
 #include "hw/i386/pc.h"
 #include "hw/i386/ioapic_internal.h"
 #include "hw/i386/apic_internal.h"
@@ -110,6 +111,15 @@ static void kvm_ioapic_put(IOAPICCommonState *s)
     }
 }
 
+void kvm_ioapic_dump_state(Monitor *mon, const QDict *qdict)
+{
+    IOAPICCommonState s;
+
+    kvm_ioapic_get(&s);
+
+    ioapic_print_redtbl(mon, &s);
+}
+
 static void kvm_ioapic_reset(DeviceState *dev)
 {
     IOAPICCommonState *s = IOAPIC_COMMON(dev);
diff --git a/hw/intc/ioapic_common.c b/hw/intc/ioapic_common.c
index 8b7d118..83edf69 100644
--- a/hw/intc/ioapic_common.c
+++ b/hw/intc/ioapic_common.c
@@ -19,6 +19,7 @@
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 
+#include "monitor/monitor.h"
 #include "hw/i386/ioapic.h"
 #include "hw/i386/ioapic_internal.h"
 #include "hw/sysbus.h"
@@ -31,6 +32,36 @@
  */
 int ioapic_no;
 
+void ioapic_print_redtbl(Monitor *mon, IOAPICCommonState *s)
+{
+    static const char *delm_str[] = {
+        "Fixed", "LowPri", "SMI", "...", "NMI", "INIT", "...", "ExtINT"};
+    int i;
+
+    monitor_printf(mon, "ioapic ID=%02x IRR=%08x SEL=%02x\n",
+                   s->id, s->irr, s->ioregsel);
+
+    for (i = 0; i < IOAPIC_NUM_PINS; i++) {
+        uint64_t entry = s->ioredtbl[i];
+        uint32_t delm = (uint32_t)((entry & IOAPIC_LVT_DELIV_MODE) >>
+                                   IOAPIC_LVT_DELIV_MODE_SHIFT);
+        monitor_printf(mon, "ioapic %02u %016jx: int=%02jx "
+                       "delmod=%x:%-6s %c%c%c%c%c%c dest=%jx\n",
+                       i, entry,
+                       entry & IOAPIC_VECTOR_MASK,
+                       delm,
+                       delm_str[delm],
+                       entry & IOAPIC_LVT_DEST_MODE ? 'L' : 'P',
+                       entry & IOAPIC_LVT_DELIV_STATUS ? 'P' : '.',
+                       entry & IOAPIC_LVT_POLARITY ? 'L' : 'H',
+                       entry & IOAPIC_LVT_REMOTE_IRR ? 'R' : '.',
+                       entry & IOAPIC_LVT_TRIGGER_MODE ? 'L' : 'E',
+                       entry & IOAPIC_LVT_MASKED ? 'M' : '.',
+                       (entry >> IOAPIC_LVT_DEST_SHIFT) &
+                            (entry & IOAPIC_LVT_DEST_MODE ? 0xff : 0xf));
+    }
+}
+
 void ioapic_reset_common(DeviceState *dev)
 {
     IOAPICCommonState *s = IOAPIC_COMMON(dev);
diff --git a/include/hw/i386/ioapic_internal.h b/include/hw/i386/ioapic_internal.h
index 4f7764e..797ed47 100644
--- a/include/hw/i386/ioapic_internal.h
+++ b/include/hw/i386/ioapic_internal.h
@@ -105,4 +105,6 @@ struct IOAPICCommonState {
 
 void ioapic_reset_common(DeviceState *dev);
 
+void ioapic_print_redtbl(Monitor *mon, IOAPICCommonState *s);
+
 #endif /* !QEMU_IOAPIC_INTERNAL_H */
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 86c5651..437085f 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -123,6 +123,10 @@ int pic_get_output(DeviceState *d);
 void hmp_info_pic(Monitor *mon, const QDict *qdict);
 void hmp_info_irq(Monitor *mon, const QDict *qdict);
 
+/* ioapic.c */
+
+void kvm_ioapic_dump_state(Monitor *mon, const QDict *qdict);
+
 /* Global System Interrupts */
 
 #define GSI_NUM_PINS IOAPIC_NUM_PINS
diff --git a/monitor.c b/monitor.c
index aad2792..5449663 100644
--- a/monitor.c
+++ b/monitor.c
@@ -957,6 +957,19 @@ int monitor_get_cpu_index(void)
     return cpu->cpu_index;
 }
 
+#if defined(TARGET_I386)
+static void hmp_info_apic_io(Monitor *mon, const QDict *qdict)
+{
+    if (kvm_irqchip_in_kernel()) {
+        kvm_ioapic_dump_state(mon, qdict);
+    }
+}
+#else
+static void hmp_info_apic_io(Monitor *mon, const QDict *qdict)
+{
+}
+#endif
+
 static void hmp_info_apic_local(Monitor *mon, const QDict *qdict)
 {
     CPUState *cpu;
@@ -2588,6 +2601,13 @@ static mon_cmd_t info_cmds[] = {
         .mhandler.cmd = hmp_info_apic_local,
     },
     {
+        .name       = "apic-io",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show io apic state",
+        .mhandler.cmd = hmp_info_apic_io,
+    },
+    {
         .name       = "cpus",
         .args_type  = "",
         .params     = "",
-- 
1.9.1