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[Qemu-devel] [PATCH v3 16/17] ahci: Recompute cur_cmd on migrate post lo
From: |
John Snow |
Subject: |
[Qemu-devel] [PATCH v3 16/17] ahci: Recompute cur_cmd on migrate post load |
Date: |
Tue, 10 Feb 2015 13:19:28 -0500 |
When the AHCI HBA device is migrated, all of the information that
led to the request being created is stored in the AHCIDevice
structures, except for pointers into guest data where return
information needs to be stored.
The "cur_cmd" field is usually responsible for this.
To rebuild the cur_cmd pointer post-migration, we can utilize
the busy_slot index to figure out where the command header
we are still processing is.
This allows a machine in a halted state from rerror=stop or
werror=stop to be migrated and resume operations without issue.
Signed-off-by: John Snow <address@hidden>
---
hw/ide/ahci.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 56a4867..5a1973f 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -1376,6 +1376,11 @@ static int ahci_state_post_load(void *opaque, int
version_id)
*/
if (ad->busy_slot == -1) {
check_cmd(s, i);
+ } else {
+ /* We are in the middle of a command, and may need to access
+ * the command header in guest memory again. */
+ assert(ad->busy_slot >= 0 && ad->busy_slot < AHCI_MAX_CMDS);
+ ad->cur_cmd = &((AHCICmdHdr *)ad->lst)[ad->busy_slot];
}
}
--
1.9.3
- [Qemu-devel] [PATCH v3 03/17] ide: introduce ide_register_restart_cb, (continued)
- [Qemu-devel] [PATCH v3 03/17] ide: introduce ide_register_restart_cb, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 05/17] ide: pass IDEBus to the restart_cb, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 07/17] ide: remove restart_cb callback, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 08/17] ide: replace set_unit callback with more IDEBus state, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 06/17] ide: move restart callback to common code, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 04/17] ide: do not use BMDMA in restart callback, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 09/17] ide: place initial state of the current request to IDEBus, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 14/17] ahci: Migrate IDEStatus, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 01/17] ide: start extracting ide_restart_dma out of bmdma_restart_dma, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 10/17] ide: migrate initial request state via IDEBus, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 16/17] ahci: Recompute cur_cmd on migrate post load,
John Snow <=
- [Qemu-devel] [PATCH v3 12/17] ide: make more functions static, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 13/17] ide: support PIO restart for the ISA controller, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 17/17] qtest/ide: Test flush / retry for ISA and PCI, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 15/17] ahci: add support for restarting non-queued commands, John Snow, 2015/02/10
- [Qemu-devel] [PATCH v3 11/17] ide: commonize io_buffer_index initialization, John Snow, 2015/02/10