File 17315-windows-bug-check-0x101-fix.patch of Package xen

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File 17315-windows-bug-check-0x101-fix.patch of Package xen (Revision 8023000c67ef060ea622591e1681761b)

Currently displaying revision 8023000c67ef060ea622591e1681761b , Show latest

# HG changeset patch
# User Keir Fraser <keir.fraser@citrix.com>
# Date 1206697850 0
# Node ID 50efc4b3ffdb7996ab58a4cb6d4d48fed197454f
# Parent  7a3702ff0e8c2c9783de6e24edd79203d5e4c070
ioemu: Perform emulated IDE flushes asynchronously.

Fixes 'Windows Bug Check 0x101 issue' in which a VCPU gets tied up for
so long doing a synchronous flush to disc that it misses critical
timer events.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Modified-by: Ian Jackson <ian.jackson@eu.citrix.com>
Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>

Index: xen-3.2.1-testing/tools/ioemu/block-qcow.c
===================================================================
--- xen-3.2.1-testing.orig/tools/ioemu/block-qcow.c
+++ xen-3.2.1-testing/tools/ioemu/block-qcow.c
@@ -725,6 +725,13 @@ static void qcow_aio_cancel(BlockDriverA
     qemu_aio_release(acb);
 }
 
+static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    BDRVQcowState *s = bs->opaque;
+    return bdrv_aio_flush(s->hd, cb, opaque);
+}
+
 static void qcow_close(BlockDriverState *bs)
 {
     BDRVQcowState *s = bs->opaque;
@@ -899,6 +906,7 @@ BlockDriver bdrv_qcow = {
     .bdrv_aio_read = qcow_aio_read,
     .bdrv_aio_write = qcow_aio_write,
     .bdrv_aio_cancel = qcow_aio_cancel,
+    .bdrv_aio_flush = qcow_aio_flush,
     .aiocb_size = sizeof(QCowAIOCB),
     .bdrv_write_compressed = qcow_write_compressed,
     .bdrv_get_info = qcow_get_info,
Index: xen-3.2.1-testing/tools/ioemu/block-qcow2.c
===================================================================
--- xen-3.2.1-testing.orig/tools/ioemu/block-qcow2.c
+++ xen-3.2.1-testing/tools/ioemu/block-qcow2.c
@@ -1007,6 +1007,13 @@ static void qcow_aio_cancel(BlockDriverA
     qemu_aio_release(acb);
 }
 
+static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    BDRVQcowState *s = bs->opaque;
+    return bdrv_aio_flush(s->hd, cb, opaque);
+}
+
 static void qcow_close(BlockDriverState *bs)
 {
     BDRVQcowState *s = bs->opaque;
@@ -2241,6 +2248,7 @@ BlockDriver bdrv_qcow2 = {
     .bdrv_aio_read = qcow_aio_read,
     .bdrv_aio_write = qcow_aio_write,
     .bdrv_aio_cancel = qcow_aio_cancel,
+    .bdrv_aio_flush = qcow_aio_flush,
     .aiocb_size = sizeof(QCowAIOCB),
     .bdrv_write_compressed = qcow_write_compressed,
 
Index: xen-3.2.1-testing/tools/ioemu/block-raw.c
===================================================================
--- xen-3.2.1-testing.orig/tools/ioemu/block-raw.c
+++ xen-3.2.1-testing/tools/ioemu/block-raw.c
@@ -496,6 +496,21 @@ static void raw_aio_cancel(BlockDriverAI
         pacb = &acb->next;
     }
 }
+
+static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    RawAIOCB *acb;
+
+    acb = raw_aio_setup(bs, 0, NULL, 0, cb, opaque);
+    if (!acb)
+        return NULL;
+    if (aio_fsync(O_SYNC, &acb->aiocb) < 0) {
+        qemu_aio_release(acb);
+        return NULL;
+    }
+    return &acb->common;
+}
 #endif
 
 static void raw_close(BlockDriverState *bs)
@@ -621,6 +636,7 @@ BlockDriver bdrv_raw = {
     .bdrv_aio_read = raw_aio_read,
     .bdrv_aio_write = raw_aio_write,
     .bdrv_aio_cancel = raw_aio_cancel,
+    .bdrv_aio_flush = raw_aio_flush,
     .aiocb_size = sizeof(RawAIOCB),
 #endif
     .protocol_name = "file",
@@ -959,6 +975,7 @@ BlockDriver bdrv_host_device = {
     .bdrv_aio_read = raw_aio_read,
     .bdrv_aio_write = raw_aio_write,
     .bdrv_aio_cancel = raw_aio_cancel,
+    .bdrv_aio_flush = raw_aio_flush,
     .aiocb_size = sizeof(RawAIOCB),
 #endif
     .bdrv_pread = raw_pread,
Index: xen-3.2.1-testing/tools/ioemu/block.c
===================================================================
--- xen-3.2.1-testing.orig/tools/ioemu/block.c
+++ xen-3.2.1-testing/tools/ioemu/block.c
@@ -48,6 +48,8 @@ static BlockDriverAIOCB *bdrv_aio_write_
         int64_t sector_num, const uint8_t *buf, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque);
 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
+static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
+        BlockDriverCompletionFunc *cb, void *opaque);
 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, 
                         uint8_t *buf, int nb_sectors);
 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
@@ -155,6 +157,8 @@ void bdrv_register(BlockDriver *bdrv)
         bdrv->bdrv_read = bdrv_read_em;
         bdrv->bdrv_write = bdrv_write_em;
     }
+    if (!bdrv->bdrv_aio_flush)
+        bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
     bdrv->next = first_drv;
     first_drv = bdrv;
 }
@@ -1138,6 +1142,17 @@ void bdrv_aio_cancel(BlockDriverAIOCB *a
     drv->bdrv_aio_cancel(acb);
 }
 
+BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, 
+                                 BlockDriverCompletionFunc *cb, void *opaque)
+{
+    BlockDriver *drv = bs->drv;
+
+    if (!drv)
+        return NULL;
+
+    return drv->bdrv_aio_flush(bs, cb, opaque);
+}
+
 
 /**************************************************************/
 /* async block device emulation */
@@ -1214,6 +1229,14 @@ static void bdrv_aio_cancel_em(BlockDriv
 }
 #endif /* !QEMU_TOOL */
 
+static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
+        BlockDriverCompletionFunc *cb, void *opaque)
+{
+    bdrv_flush(bs);
+    cb(opaque, 0);
+    return NULL;
+}
+
 /**************************************************************/
 /* sync block device emulation */
 
Index: xen-3.2.1-testing/tools/ioemu/block_int.h
===================================================================
--- xen-3.2.1-testing.orig/tools/ioemu/block_int.h
+++ xen-3.2.1-testing/tools/ioemu/block_int.h
@@ -49,6 +49,8 @@ struct BlockDriver {
         int64_t sector_num, const uint8_t *buf, int nb_sectors,
         BlockDriverCompletionFunc *cb, void *opaque);
     void (*bdrv_aio_cancel)(BlockDriverAIOCB *acb);
+    BlockDriverAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs,
+        BlockDriverCompletionFunc *cb, void *opaque);
     int aiocb_size;
 
     const char *protocol_name;
Index: xen-3.2.1-testing/tools/ioemu/hw/ide.c
===================================================================
--- xen-3.2.1-testing.orig/tools/ioemu/hw/ide.c
+++ xen-3.2.1-testing/tools/ioemu/hw/ide.c
@@ -742,6 +742,7 @@ static inline void ide_abort_command(IDE
 static inline void ide_set_irq(IDEState *s)
 {
     BMDMAState *bm = s->bmdma;
+    if (!s->bs) return; /* yikes */
     if (!(s->cmd & IDE_CMD_DISABLE_IRQ)) {
         if (bm) {
             bm->status |= BM_STATUS_INT;
@@ -907,6 +908,8 @@ static void ide_read_dma_cb(void *opaque
     int n;
     int64_t sector_num;
 
+    if (!s->bs) return; /* yikes */
+
     n = s->io_buffer_size >> 9;
     sector_num = ide_get_sector(s);
     if (n > 0) {
@@ -1015,6 +1018,8 @@ static void ide_write_dma_cb(void *opaqu
     int n;
     int64_t sector_num;
 
+    if (!s->bs) return; /* yikes */
+
     n = s->io_buffer_size >> 9;
     sector_num = ide_get_sector(s);
     if (n > 0) {
@@ -1063,6 +1068,39 @@ static void ide_sector_write_dma(IDEStat
     ide_dma_start(s, ide_write_dma_cb);
 }
 
+static void ide_device_utterly_broken(IDEState *s) {
+    s->status |= BUSY_STAT;
+    s->bs = NULL;
+    /* This prevents all future commands from working.  All of the
+     * asynchronous callbacks (and ide_set_irq, as a safety measure)
+     * check to see whether this has happened and bail if so.
+     */
+}
+
+static void ide_flush_cb(void *opaque, int ret)
+{
+    IDEState *s = opaque;
+
+    if (!s->bs) return; /* yikes */
+
+    if (ret) {
+        /* We are completely doomed.  The IDE spec does not permit us
+	 * to return an error from a flush except via a protocol which
+	 * requires us to say where the error is and which
+	 * contemplates the guest repeating the flush attempt to
+	 * attempt flush the remaining data.  We can't support that
+	 * because f(data)sync (which is what the block drivers use
+	 * eventually) doesn't report the necessary information or
+	 * give us the necessary control.  So we make the disk vanish.
+	 */
+	ide_device_utterly_broken(s);
+	return;
+    }
+    else
+        s->status = READY_STAT;
+    ide_set_irq(s);
+}
+
 static void ide_atapi_cmd_ok(IDEState *s)
 {
     s->error = 0;
@@ -1289,6 +1327,8 @@ static void ide_atapi_cmd_read_dma_cb(vo
     IDEState *s = bm->ide_if;
     int data_offset, n;
 
+    if (!s->bs) return; /* yikes */
+
     if (ret < 0) {
         ide_atapi_io_error(s, ret);
         goto eot;
@@ -1694,6 +1734,8 @@ static void cdrom_change_cb(void *opaque
     IDEState *s = opaque;
     int64_t nb_sectors;
 
+    if (!s->bs) return; /* yikes */
+
     /* XXX: send interrupt too */
     bdrv_get_geometry(s->bs, &nb_sectors);
     s->nb_sectors = nb_sectors;
@@ -1797,8 +1839,8 @@ static void ide_ioport_write(void *opaqu
         printf("ide: CMD=%02x\n", val);
 #endif
         s = ide_if->cur_drive;
-        /* ignore commands to non existant slave */
-        if (s != ide_if && !s->bs) 
+        /* ignore commands to non existant device */
+        if (!s->bs) 
             break;
 
         switch(val) {
@@ -1967,10 +2009,8 @@ static void ide_ioport_write(void *opaqu
             break;
         case WIN_FLUSH_CACHE:
         case WIN_FLUSH_CACHE_EXT:
-            if (s->bs)
-                bdrv_flush(s->bs);
-	    s->status = READY_STAT;
-            ide_set_irq(s);
+            s->status = BUSY_STAT;
+            bdrv_aio_flush(s->bs, ide_flush_cb, s);
             break;
         case WIN_IDLEIMMEDIATE:
         case WIN_STANDBY:
Index: xen-3.2.1-testing/tools/ioemu/vl.h
===================================================================
--- xen-3.2.1-testing.orig/tools/ioemu/vl.h
+++ xen-3.2.1-testing/tools/ioemu/vl.h
@@ -650,6 +650,8 @@ BlockDriverAIOCB *bdrv_aio_write(BlockDr
                                  const uint8_t *buf, int nb_sectors,
                                  BlockDriverCompletionFunc *cb, void *opaque);
 void bdrv_aio_cancel(BlockDriverAIOCB *acb);
+BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, 
+                                 BlockDriverCompletionFunc *cb, void *opaque);
 
 void qemu_aio_init(void);
 void qemu_aio_poll(void);

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File 17315-windows-bug-check-0x101-fix.patch of Package xen (Revision 8023000c67ef060ea622591e1681761b)

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