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ide: don't lose pending dma state

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If the migration occurs after the IDE DMA has been set up but before it
has been initiated, the state gets lost upon save/restore. Specifically,
->dma_cb callback gets cleared, so, when the guest eventually starts bus
mastering, the DMA never completes, causing the guest to time out the
operation.

OTOH all the infrastructure is already in place to restart the DMA if
the migration happens while the DMA is in progress.

So reuse that infrastructure, by setting bus->error_status based on
->dma_cmd in pre_save if ->dma_cb callback is already set but DMAING is
clear. This will indicate the need for restart and make sure ->dma_cb
is restored in ide_restart_bh(); howeover since DMAING is clear the state
upon restore will be exactly "ready for DMA" as before the save.

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 1459924806-306-2-git-send-email-den@openvz.org
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Pavel Butsykin 2016-04-12 16:47:52 -04:00 committed by John Snow
parent d1fc684f36
commit 218fd37c68
3 changed files with 20 additions and 8 deletions
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9
hw/ide/core.c
View File

@ -804,14 +804,7 @@ static void ide_dma_cb(void *opaque, int ret)
return;
}
if (ret < 0) {
int op = IDE_RETRY_DMA;
if (s->dma_cmd == IDE_DMA_READ)
op |= IDE_RETRY_READ;
else if (s->dma_cmd == IDE_DMA_TRIM)
op |= IDE_RETRY_TRIM;
if (ide_handle_rw_error(s, -ret, op)) {
if (ide_handle_rw_error(s, -ret, ide_dma_cmd_to_retry(s->dma_cmd))) {
return;
}
}

15
hw/ide/internal.h
View File

@ -513,6 +513,21 @@ struct IDEDevice {
#define IDE_RETRY_TRIM 0x80
#define IDE_RETRY_HBA 0x100
static inline uint8_t ide_dma_cmd_to_retry(uint8_t dma_cmd)
{
switch (dma_cmd) {
case IDE_DMA_READ:
return IDE_RETRY_DMA | IDE_RETRY_READ;
case IDE_DMA_WRITE:
return IDE_RETRY_DMA;
case IDE_DMA_TRIM:
return IDE_RETRY_DMA | IDE_RETRY_TRIM;
default:
break;
}
return 0;
}
static inline IDEState *idebus_active_if(IDEBus *bus)
{
return bus->ifs + bus->unit;

4
hw/ide/pci.c
View File

@ -308,6 +308,10 @@ static void ide_bmdma_pre_save(void *opaque)
BMDMAState *bm = opaque;
uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
if (!(bm->status & BM_STATUS_DMAING) && bm->dma_cb) {
bm->bus->error_status =
ide_dma_cmd_to_retry(bmdma_active_if(bm)->dma_cmd);
}
bm->migration_retry_unit = bm->bus->retry_unit;
bm->migration_retry_sector_num = bm->bus->retry_sector_num;
bm->migration_retry_nsector = bm->bus->retry_nsector;