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Re: [PATCH v7] xen: allow up to 16383 cpus





On 10/05/2024 22:11, Andrew Cooper wrote:
On 10/05/2024 10:08 pm, Julien Grall wrote:
Hi Juergen,

On 10/05/2024 15:16, Juergen Gross wrote:
With lock handling now allowing up to 16384 cpus (spinlocks can handle
65535 cpus, rwlocks can handle 16384 cpus), raise the allowed limit for
the number of cpus to be configured to 16383.

The new limit is imposed by IOMMU_CMD_BUFFER_MAX_ENTRIES and
QINVAL_MAX_ENTRY_NR required to be larger than 2 * CONFIG_NR_CPUS.

Add a support limit of physical CPUs to SUPPORT.md (4096 on x86, 128
on ARM).

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

I am a bit surprised that this is kept given you added SUPPORT.md. I'd
like Jan (or other x86 maintainers) to confirm they are happy with the
proposed x86 security supported limit the SUPPORT.md.

For Arm (only):

Acked-by: Julien Grall <jgrall@xxxxxxxxxx>

XenServer is currently at 2k and we're waiting on this series to move to 4k.

I'm happy with this being the security statement for now.

Thanks for confirming :). Committed.

Cheers,

--
Julien Grall



 


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