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Re: [PATCH v3 3/8] x86: update GADDR based secondary time area
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Wed, 27 Sep 2023 12:14:40 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Wed, 27 Sep 2023 10:15:15 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Wed, May 03, 2023 at 05:55:52PM +0200, Jan Beulich wrote:
> Before adding a new vCPU operation to register the secondary time area
> by guest-physical address, add code to actually keep such areas up-to-
> date.
>
> Note that pages aren't marked dirty when written to (matching the
> handling of space mapped by map_vcpu_info()), on the basis that the
> registrations are lost anyway across migration (or would need re-
> populating at the target for transparent migration). Plus the contents
> of the areas in question have to be deemed volatile in the first place
> (so saving a "most recent" value is pretty meaningless even for e.g.
> snapshotting).
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks, Roger.
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