5b15e2ecaf
Notable changes:
* The only big change is the switch to using a custom QIOChannel for
savevm-async, because the previously used QEMUFileOps was dropped.
Changes to the current implementation:
* Switch to vector based methods as required for an IO channel. For
short reads the passed-in IO vector is stuffed with zeroes at the
end, just to be sure.
* For reading: The documentation in include/io/channel.h states that
at least one byte should be read, so also error out when whe are
at the very end instead of returning 0.
* For reading: Fix off-by-one error when request goes beyond end.
The wrong code piece was:
if ((pos + size) > maxlen) {
size = maxlen - pos - 1;
}
Previously, the last byte would not be read. It's actually
possible to get a snapshot .raw file that has content all the way
up the final 512 byte (= BDRV_SECTOR_SIZE) boundary without any
trailing zero bytes (I wrote a script to do it).
Luckily, it didn't cause a real issue, because qemu_loadvm_state()
is not interested in the final (i.e. QEMU_VM_VMDESCRIPTION)
section. The buffer for reading it is simply freed up afterwards
and the function will assume that it read the whole section, even
if that's not the case.
* For writing: Make use of the generated blk_pwritev() wrapper
instead of manually wrapping the coroutine to simplify and save a
few lines.
* Adapt to changed interfaces for blk_{pread,pwrite}:
* a9262f551e ("block: Change blk_{pread,pwrite}() param order")
* 3b35d4542c ("block: Add a 'flags' param to blk_pread()")
* bf5b16fa40 ("block: Make blk_{pread,pwrite}() return 0 on success")
Those changes especially affected the qemu-img dd patches, because
the context also changed, but also some of our block drivers used
the functions.
* Drop qemu-common.h include: it got renamed after essentially
everything was moved to other headers. The only remaining user I
could find for things dropped from the header between 7.0 and 7.1
was qemu_get_vm_name() in the iscsi-initiatorname patch, but it
already includes the header to which the function was moved.
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
42 lines
1.8 KiB
Diff
42 lines
1.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Date: Mon, 6 Apr 2020 12:16:54 +0200
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Subject: [PATCH] PVE: [Compat]: 4.0 used balloon qemu-4-0-config-size false
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here
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The underlying issue why this change from upstream to us arised in
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the first place is that QEMU 4.0 was already released at the point we
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run into this migration issue, so we did the then obvious fallback to
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false for virtio-balloon-device qemu-4-0-config-size.
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QEMU made that switch back in 4.1, where it now uses a backward
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compatible mechanism to detect if the bigger CFG sizes should be
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used, i.e., checking the VIRTIO_BALLOON_F_PAGE_POISON or
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VIRTIO_BALLOON_F_FREE_PAGE_HINT balloon feature flags.
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As for them, upstream released version 4.0 had this to true they keep
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it to true in their compatibility record for the 4.0 machine, to
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allow live migrations from 4.0 to 4.1.
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As for us, downstream released version 4.0 (first public release of
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this QEMU) had this to false, we change it back to false again, for
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the same reason.
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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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---
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hw/core/machine.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/hw/core/machine.c b/hw/core/machine.c
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index a673302cce..fa424440bd 100644
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--- a/hw/core/machine.c
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+++ b/hw/core/machine.c
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@@ -127,7 +127,8 @@ GlobalProperty hw_compat_4_0[] = {
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{ "virtio-vga", "edid", "false" },
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{ "virtio-gpu-device", "edid", "false" },
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{ "virtio-device", "use-started", "false" },
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- { "virtio-balloon-device", "qemu-4-0-config-size", "true" },
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+ // PVE differed from upstream for 4.0 balloon cfg size
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+ { "virtio-balloon-device", "qemu-4-0-config-size", "false" },
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{ "pl031", "migrate-tick-offset", "false" },
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};
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const size_t hw_compat_4_0_len = G_N_ELEMENTS(hw_compat_4_0);
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