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Re: [PATCH v2] x86/domain: adjust limitation on shared_info allocation below 4G
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 4 Feb 2026 16:12:22 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Jan Beulich <jbeulich@xxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Wed, 04 Feb 2026 15:13:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04/02/2026 3:01 pm, Roger Pau Monné wrote:
>>> + share_xen_page_with_guest(virt_to_page(d->shared_info), d,
>>> SHARE_rw);
>>> + /* Ensure all references to the old shared_info page are dropped.
>>> */
>>> + for_each_vcpu( d, v )
>>> + vcpu_info_reset(v);
>> switch_compat() can only occur on a domain with no memory. How can we
>> have outstanding references?
> As Jan pointed out, it's not references, but stashed pointers to the
> previous shared_info page. I've used the wrong wording here.
Yes, I saw that thread, but my question still stands.
How can there be any this early in the domain's lifecycle?
~Andrew
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