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Re: [PATCH v2 2/7] xen: introduce generic helper checking for memory map conflicts
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Thu, 22 Aug 2024 13:29:40 +0200
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- Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx
- Delivery-date: Thu, 22 Aug 2024 11:30:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20.08.24 10:35, Jan Beulich wrote:
On 20.08.2024 10:20, Juergen Gross wrote:
When booting as a Xen PV dom0 the memory layout of the dom0 is
modified to match that of the host, as this requires less changes in
the kernel for supporting Xen.
There are some cases, though, which are problematic, as it is the Xen
hypervisor selecting the kernel's load address plus some other data,
which might conflict with the host's memory map.
These conflicts are detected at boot time and result in a boot error.
In order to support handling at least some of these conflicts in
future, introduce a generic helper function which will later gain the
ability to adapt the memory layout when possible.
Add the missing check for the xen_start_info area.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Tested-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
However, since you mention the start_info area it may be worth adding half
a sentence to the description also mentioning why the hypervisor allocated
stack page doesn't need checking. In fact this may want to extend to
initrd and phys-mach map as well, to cover everything Xen sets up on behalf
of the kernel.
Okay.
Juergen
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