On 05/02/2026 8:03 am, Roger Pau Monne wrote:
> The limitation of shared_info being allocated below 4G to fit in the
> start_info field only applies to 32bit PV guests. On 64bit PV guests the
> start_info field is 64bits wide. HVM guests don't use start_info at all.
>
> Drop the restriction in arch_domain_create() and instead free and
> re-allocate the page from memory below 4G if needed in switch_compat(),
> when the guest is set to run in 32bit PV mode.
>
> Fixes: 3cadc0469d5c ("x86_64: shared_info must be allocated below 4GB as it
> is advertised to 32-bit guests via a 32-bit machine address field in
> start_info.")
> Signed-off-by: Roger Pau Monné <[email protected]>
> Reviewed-by: Jan Beulich <[email protected]>
Reviewed-by: Andrew Cooper <[email protected]>
