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Re: [Qemu-devel] [PATCH] Properly check if 'log dirty' flags have change
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH] Properly check if 'log dirty' flags have changed |
Date: |
Mon, 17 Feb 2014 10:23:27 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 |
On 02/17/2014 06:47 AM, Vincent KHERBACHE wrote:
> The test (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) is not
> good because the condition is valid when enable == 0 and current dirty log
> memory flag is set.
> As a consequence kvm_log_global_stop() does not stop the KVM dirty log
> tracking: kvm_set_migration_log(0) didn't do its job.
> So instead I propose to use kvm_slot_dirty_pages_log_change() which correctly
> compare the memory flags (old/new).
>
> Signed-off-by: Vincent KHERBACHE <address@hidden>
> ---
> kvm-all.c | 12 +++---------
> 1 file changed, 3 insertions(+), 9 deletions(-)
>
> + err = kvm_slot_dirty_pages_log_change(mem, (bool)enable);
Casting to bool looks odd. We already require a compliant C99 compiler,
which means the compiler already properly handles the squashing of all
non-zero values to true when calling a function with a parameter
prototyped as bool, without needing the cast.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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