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Re: [Xen-devel] [RFC PATCH 83/84] x86/pmap: rewrite logic for locking.

To: hongyax@xxxxxxxxxx
From: Wei Liu <wl@xxxxxxx>
Date: Thu, 26 Sep 2019 16:50:26 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Delivery-date: Thu, 26 Sep 2019 15:50:31 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On Thu, Sep 26, 2019 at 10:46:46AM +0100, hongyax@xxxxxxxxxx wrote:
> From: Hongyan Xia <hongyax@xxxxxxxxxx>
> 
> Due to the limited PMAP entries, another pCPU is allowed to use PMAP
> only when the current pCPU has unmapped all mappings.
> 

Under what condition would two pCPUs try to use PMAP at the same time?

Wei.

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References:
- [Xen-devel] [RFC PATCH 00/84] Remove direct map from Xen
  - From: hongyax
- [Xen-devel] [RFC PATCH 83/84] x86/pmap: rewrite logic for locking.
  - From: hongyax

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