|
 |
05bba0 |
From 26631da9bba6bcf000b4a87715cb3e8364afc373 Mon Sep 17 00:00:00 2001
|
|
|
05bba0 |
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
|
|
|
05bba0 |
Date: Tue, 10 Feb 2015 11:45:35 +0100
|
|
|
05bba0 |
Subject: [PATCH 09/16] Restore atapi_dma flag across migration
|
|
|
05bba0 |
|
|
|
05bba0 |
Message-id: <1423568736-19538-2-git-send-email-dgilbert@redhat.com>
|
|
|
05bba0 |
Patchwork-id: 63778
|
|
|
05bba0 |
O-Subject: [RHEL-7.2 qemu-kvm PATCH 1/2] Restore atapi_dma flag across migration
|
|
|
05bba0 |
Bugzilla: 892258
|
|
|
05bba0 |
RH-Acked-by: Juan Quintela <quintela@redhat.com>
|
|
|
05bba0 |
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
|
|
|
05bba0 |
RH-Acked-by: John Snow <jsnow@redhat.com>
|
|
|
05bba0 |
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
|
|
|
05bba0 |
|
|
|
05bba0 |
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
|
|
|
05bba0 |
|
|
|
05bba0 |
If a migration happens just after the guest has kicked
|
|
|
05bba0 |
off an ATAPI command and kicked off DMA, we lose the atapi_dma
|
|
|
05bba0 |
flag, and the destination tries to complete the command as PIO
|
|
|
05bba0 |
rather than DMA. This upsets Linux; modern libata based kernels
|
|
|
05bba0 |
stumble and recover OK, older kernels end up passing bad data
|
|
|
05bba0 |
to userspace.
|
|
|
05bba0 |
|
|
|
05bba0 |
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
|
05bba0 |
Reviewed-by: John Snow <jsnow@redhat.com>
|
|
|
05bba0 |
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
|
|
|
05bba0 |
(cherry picked from commit 819fa276311ce328a8e38ad9306c1093961b3f4b)
|
|
|
05bba0 |
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
05bba0 |
---
|
|
|
05bba0 |
hw/ide/core.c | 1 +
|
|
|
05bba0 |
1 file changed, 1 insertion(+)
|
|
|
05bba0 |
|
|
|
05bba0 |
diff --git a/hw/ide/core.c b/hw/ide/core.c
|
|
|
05bba0 |
index 24a1708..9a22425 100644
|
|
|
05bba0 |
--- a/hw/ide/core.c
|
|
|
05bba0 |
+++ b/hw/ide/core.c
|
|
|
05bba0 |
@@ -2283,6 +2283,7 @@ static int ide_drive_pio_post_load(void *opaque, int version_id)
|
|
|
05bba0 |
s->end_transfer_func = transfer_end_table[s->end_transfer_fn_idx];
|
|
|
05bba0 |
s->data_ptr = s->io_buffer + s->cur_io_buffer_offset;
|
|
|
05bba0 |
s->data_end = s->data_ptr + s->cur_io_buffer_len;
|
|
|
05bba0 |
+ s->atapi_dma = s->feature & 1; /* as per cmd_packet */
|
|
|
05bba0 |
|
|
|
05bba0 |
return 0;
|
|
|
05bba0 |
}
|
|
|
05bba0 |
--
|
|
|
05bba0 |
1.8.3.1
|
|
|
05bba0 |
|