Re: [PATCH v2] kvm: Fix kvm_vm_ioctl() and kvm_device_ioctl() return value

[Michael Tokarev]

On 11/28/25 18:20, Markus Armbruster wrote:

These functions wrap ioctl().  When ioctl() fails, it sets @errno.
The wrappers then return that @errno negated.

Except they call accel_ioctl_end() between calling ioctl() and reading
@errno.  accel_ioctl_end() can clobber @errno, e.g. when a futex()
system call fails.  Seems unlikely, but it's a bug all the same.

Fix by retrieving @errno before calling accel_ioctl_end().

Fixes: a27dd2de68f3 (KVM: keep track of running ioctls)
Signed-off-by: Markus Armbruster <arm...@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <phi...@linaro.org>

Isn't this a qemu-stable material?

Thanks,

/mjt