Hi,
This one is for QEMU master, 1493049 is for Ubuntu packages.
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https://bugs.launchpad.net/bugs/1497479
Title:
memory corruption with migrate/savevm in TCG mode
Status in QEMU:
N
** Description changed:
[ISSUE]
QEMU releases 2.3.1 and lower are forgetting to flush TLBs before
enabling the global dirty pages log and entering the final stage of
saving the VM.
[DESCRIPTION]
The situation is the following:
1. TLB misses is the only way for page dirtying
Public bug reported:
[ISSUE]
QEMU releases 2.3.1 and lower are forgetting to flush TLBs before
enabling the global dirty pages log and entering the final stage of
saving the VM.
[DESCRIPTION]
The situation is the following:
1. TLB misses is the only way for page dirtying in the TCG mode.
2. If
A little self-update here.
1. It is seems to be enough to just flush TLB entries with the iothread
lock held since the CPUs are stopped here.
2. The upstream version is not vulnerable to the bug due to the following
code call path: ram_save_setup -> memory_global_dirty_log_start ->
memory_region_
Dear All,
As a result of fixing the bug [1] I discovered that QEMU in pure emulation
(TCG) sometimes misses page dirtying on the migration. This is happens at
least in the version 2.0.0 and should, according to the code, be the same
in the master as well.
The reason for that is that only pages mi
