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hw/arm: xenpvh: Add support for SMP guests 

Add SMP support for Xen PVH ARM guests.
Create ms->smp.max_cpus ioreq servers to handle hotplug.

Note that ms->smp.max_cpus will be passed to us by the
user (Xen tools) set to the guests maxvcpus.

The value in mc->max_cpus is an absolute maximum for the
-smp option and won't be used to setup ioreq servers unless
the user explicitly specifies it with -smp.

If the user doesn't pass -smp on the command-line, smp.cpus
and smp.max_cpus will default to 1.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
This commit is contained in:
Edgar E. Iglesias 2024-08-08 13:30:12 +02:00
parent 4850c6cc56
commit b421a0dce6
1 changed files with 21 additions and 2 deletions
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23
hw/arm/xen_arm.c
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@ -173,7 +173,7 @@ static void xen_arm_init(MachineState *machine)
xen_init_ram(machine);
xen_register_ioreq(xam->state, machine->smp.cpus, &xen_memory_listener);
xen_register_ioreq(xam->state, machine->smp.max_cpus, &xen_memory_listener);
xen_create_virtio_mmio_devices(xam);
@ -218,7 +218,26 @@ static void xen_arm_machine_class_init(ObjectClass *oc, void *data)
MachineClass *mc = MACHINE_CLASS(oc);
mc->desc = "Xen PVH ARM machine";
mc->init = xen_arm_init;
mc->max_cpus = 1;
/*
* mc->max_cpus holds the MAX value allowed in the -smp command-line opts.
*
* 1. If users don't pass any -smp option:
* ms->smp.cpus will default to 1.
* ms->smp.max_cpus will default to 1.
*
* 2. If users pass -smp X:
* ms->smp.cpus will be set to X.
* ms->smp.max_cpus will also be set to X.
*
* 3. If users pass -smp X,maxcpus=Y:
* ms->smp.cpus will be set to X.
* ms->smp.max_cpus will be set to Y.
*
* In scenarios 2 and 3, if X or Y are set to something larger than
* mc->max_cpus, QEMU will bail out with an error message.
*/
mc->max_cpus = GUEST_MAX_VCPUS;
mc->default_machine_opts = "accel=xen";
/* Set explicitly here to make sure that real ram_size is passed */
mc->default_ram_size = 0;