From 218fd37c68e450dffe37832e82a1f0a6592e7169 Mon Sep 17 00:00:00 2001 From: Pavel Butsykin Date: Tue, 12 Apr 2016 16:47:52 -0400 Subject: ide: don't lose pending dma state 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 Reviewed-by: Roman Kagan Signed-off-by: Denis V. Lunev Reviewed-by: John Snow Message-id: 1459924806-306-2-git-send-email-den@openvz.org Signed-off-by: John Snow --- hw/ide/core.c | 9 +-------- hw/ide/internal.h | 15 +++++++++++++++ hw/ide/pci.c | 4 ++++ 3 files changed, 20 insertions(+), 8 deletions(-) diff --git a/hw/ide/core.c b/hw/ide/core.c index 90524d5e16..58d06876dc 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -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; } } diff --git a/hw/ide/internal.h b/hw/ide/internal.h index 86bde26551..68c7d0d87e 100644 --- a/hw/ide/internal.h +++ b/hw/ide/internal.h @@ -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; diff --git a/hw/ide/pci.c b/hw/ide/pci.c index 92ffee7264..8d56a00b1b 100644 --- a/hw/ide/pci.c +++ b/hw/ide/pci.c @@ -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; -- cgit v1.2.1