Re: [Qemu-devel] [PATCH v3] ivshmem: Fix 64 bit memory bar configuration

[Markus Armbruster <armbru@redhat.com>]

Zhuangyanying <ann.zhuangyanying@huawei.com> writes:

> From: Zhuang Yanying <ann.zhuangyanying@huawei.com>
>
>     Device ivshmem property use64=0 is designed to make the device
>     expose a 32 bit shared memory BAR instead of 64 bit one.  The
>     default is a 64 bit BAR, except pc-1.2 and older retain a 32 bit
>     BAR.  A 32 bit BAR can support only up to 1 GiB of shared memory.
>
>     This worked as designed until commit 5400c02 accidentally flipped
>     its sense: since then, we misinterpret use64=0 as use64=1 and vice
>     versa.  Worse, the default got flipped as well.  Devices
>     ivshmem-plain and ivshmem-doorbell are not affected.
>
>     Fix by restoring the test of IVShmemState member not_legacy_32bit
>     that got messed up in commit 5400c02.  Also update its
>     initialization for devices ivhsmem-plain and ivshmem-doorbell.
>     Without that, they'd regress to 32 bit BARs.
>
>     Cc: qemu-stable@nongnu.org
>     Signed-off-by: Zhuang Yanying <ann.zhuangyanying@huawei.com>
>     Reviewed-by: Gonglei <arei.gonglei@huawei.com>
>     Reviewed-by: Marc-Andr. Lureau <marcandre.lureau@redhat.com>

Commit message should not be indented, and Marc-André's name got
mangled.  Both could be touched up on commit.

Thanks again for cleaning up my mess.

Reviewed-by: Markus Armbruster <armbru@redhat.com>