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SubjectRe: [PATCH] xen: don't use privcmd_call() from xen_mc_flush()
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On 08/07/2018 09:11 AM, Juergen Gross wrote:
> On 13/06/18 11:58, Juergen Gross 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>
> Boris, any objections?


I think Jan wanted a change in commit message. I can commit with this:

"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.

Even if currently not a problem (pv domains can't use SMAP while HVM
and PVH domains can't use multicalls) things might change when
PVH dom0 support is added to the kernel."


-boris

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