[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [PATCH] x86/pv: Flush TLB in response to paging structure changes

To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
From: Jan Beulich <jbeulich@xxxxxxxx>
Date: Wed, 21 Oct 2020 07:58:15 +0200
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
Delivery-date: Wed, 21 Oct 2020 05:58:46 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 20.10.2020 17:24, Andrew Cooper wrote:
> A couple of minor points.
> 
>  * PV guests can create global mappings.  I can't reason any safe way to relax
>    FLUSH_TLB_GLOBAL to just FLUSH_TLB.

We only care about guest view here, and from guest view we only
care about non-leaf entries. Non-leaf entries can't be global,
and luckily (for now at least) the G bit also doesn't get
different meaning assigned in non-leaf entries.

Jan

References:
- [PATCH] x86/pv: Flush TLB in response to paging structure changes
  - From: Andrew Cooper

Prev by Date: [qemu-mainline test] 156040: regressions - FAIL
Next by Date: [xen-4.14-testing test] 156031: regressions - FAIL
Previous by thread: Re: [PATCH] x86/pv: Flush TLB in response to paging structure changes
Next by thread: [PATCH] x86/pv: Flush TLB in response to paging structure changes
Index(es):
- Date
- Thread

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.