Re: [PATCH v6 8/8] xen: allow up to 16383 cpus

[Juergen Gross]

On 08.04.24 09:10, Jan Beulich wrote:

On 27.03.2024 16:22, 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.

Signed-off-by: Juergen Gross <jgr...@suse.com>

Acked-by: Jan Beulich <jbeul...@suse.com>

I'd prefer this to also gain an Arm ack, though.

Any comment from Arm side?


Juergen

Jan

--- a/xen/arch/Kconfig
+++ b/xen/arch/Kconfig
@@ -6,7 +6,7 @@ config PHYS_ADDR_T_32

        int "Maximum number of CPUs"
-       range 1 4095
+       range 1 16383
        default "256" if X86
        default "8" if ARM && RCAR3
        default "4" if ARM && QEMU

config NR_CPUS

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