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Re: [PATCH] tools/libxl: Only read legacy altp2m on HVM
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Mon, 12 May 2025 19:57:42 -0400
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- Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>
- Delivery-date: Mon, 12 May 2025 23:57:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2025-05-12 19:54, Jason Andryuk wrote:
Only read the HVM union b_info->u.hvm on HVM guests. The union
access is not guarded, so this reads even on non-HVM guests. Usually
this doesn't matter as PV and PVH unions are smaller and
zero-initialized. But it could incorrectly set b_info->altp2m through
aliased data.
Oops. I re-phrased the commit message, but I accidentally had an old
version in the directory. Sorry about that. Please disregard this one
and review "tools/libxl: Only access legacy altp2m on HVM".
Thanks,
Jason
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