lkml.org 
[lkml]   [2018]   [Jun]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Xen-devel] [PATCH] xen: don't use privcmd_call() from xen_mc_flush()
>>> On 13.06.18 at 12:05, <JBeulich@suse.com> wrote:
>>>> On 13.06.18 at 11:58, <jgross@suse.com> wrote:
>> Using privcmd_call() for a singleton multicall seems to be wrong, as
>> privcmd_call() is using stac()/clac() to enable hypervisor access to
>> Linux user space.
>>
>> Add a new xen_single_call() function to be use for that purpose.
>>
>> Reported-by: Jan Beulich <jbeulich@suse.com>
>> Signed-off-by: Juergen Gross <jgross@suse.com>
>
> Reviewed-by: Jan Beulich <jbeulich@suse.com>

Actually I've only now realized that this isn't a real problem right now:
PV can't use SMAP (we don't provide a virtualized version of it), and
HVM/PVH can't use multicalls (which may have to change for PVH Dom0,
so having the change in place is helpful anyway), so the whole
in-kernel logic to collect and issue batches should be unreachable there.

But perhaps the commit message would benefit from a little bit of
re-wording.

Jan


\
 
 \ /
  Last update: 2018-06-13 12:20    [W:0.095 / U:0.096 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site