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Re: [PATCH v2 5/8] x86/xen/time: Clear xen_clock mapping later
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Wed, 11 Nov 2026 07:59:25 +0100
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- Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Wed, 11 Nov 2026 06:59:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.10.26 19:06, Teddy Astie wrote:
The current logic has a corner case when both xen_save_time_memory_area()
and xen_restore_time_memory_area() fails. In this case, the mapping is never
cleared and kept with previous pvclock values (invalidating the comment
regarding VDSO_CLOCKMODE_PVCLOCK as the data may not have been zeroed).
Also convert the clear_page with a memset, there's no need to clear the
entire page when we only care about 64 bytes of it.
Fixes: 2229f70b5bbb ("x86/xen/time: setup vcpu 0 time info page")
Signed-off-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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