On 06/19/2012 01:50 PM, Alexander Graf wrote:
>
> On 06.06.2012, at 17:52, Alexander Graf wrote:
>
>> On 06/06/2012 02:28 PM, Avi Kivity wrote:
>>> On 06/01/2012 01:20 PM, Paul Mackerras wrote:
>>>> At the moment we call kvmppc_pin_guest_page() in kvmppc_update_vpa()
>>>> with two spinlocks held: the vcore lock and the vcpu->vpa_update_lock.
>>>> This is not good, since kvmppc_pin_guest_page() calls down_read() and
>>>> get_user_pages_fast(), both of which can sleep. This bug was introduced
>>>> in 2e25aa5f ("KVM: PPC: Book3S HV: Make virtual processor area
>>>> registration more robust").
>>>>
>>>> This arranges to drop those spinlocks before calling
>>>> kvmppc_pin_guest_page() and re-take them afterwards. Dropping the
>>>> vcore lock in kvmppc_run_core() means we have to set the vcore_state
>>>> field to VCORE_RUNNING before we drop the lock, so that other vcpus
>>>> won't try to run this vcore.
>>>>
>>>> Signed-off-by: Paul Mackerras<pau...@samba.org>
>>>> ---
>>>> Since this bug is in Linus' tree, and it can cause a scheduling while
>>>> atomic bug message, can we send this to Linus for inclusion in 3.5,
>>>> after review of course?
>>>>
>>> Sure, Alex?
>>
>> Yup, reviewed and tested. Looks ready to go into the tree to me. Can you
>> pull it in the short way please?
>
> Avi?
Sorry! Applied to master, will push upstream shortly.
--
error compiling committee.c: too many arguments to function
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
