linux-kernel - Re: [PATCH] xen: don't use privcmd_call() from xen_mc

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Message-ID: <5914dd79-bbeb-34f3-f4c5-d9434e96fb2c@oracle.com>
Date:   Tue, 7 Aug 2018 12:42:48 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH] xen: don't use privcmd_call() from xen_mc_flush()

On 08/07/2018 11:17 AM, Juergen Gross wrote:
> On 07/08/18 16:02, Boris Ostrovsky wrote:
>> 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@...e.com>
>>>> Signed-off-by: Juergen Gross <jgross@...e.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."
> This would be fine, thanks.

Applied to for-linus-4.19