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spapr: Pass the maximum number of vCPUs to the KVM interrupt controller

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The XIVE and XICS-on-XIVE KVM devices on POWER9 hosts can greatly reduce
their consumption of some scarce HW resources, namely Virtual Presenter
identifiers, if they know the maximum number of vCPUs that may run in the
VM.

Prepare ground for this by passing the value down to xics_kvm_connect()
and kvmppc_xive_connect(). This is purely mechanical, no functional
change.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <157478678301.67101.2717368060417156338.stgit@bahia.tlslab.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2019-11-26 17:46:23 +01:00 • committed by David Gibson
parent 2a886794f1
commit 4ffb749688
8 changed files with 28 additions and 13 deletions
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5
hw/intc/xics_spapr.c
View file

@ -422,10 +422,11 @@ static int xics_spapr_post_load(SpaprInterruptController *intc, int version_id)
return 0;
}
static int xics_spapr_activate(SpaprInterruptController *intc, Error **errp)
static int xics_spapr_activate(SpaprInterruptController *intc,
uint32_t nr_servers, Error **errp)
{
if (kvm_enabled()) {
return spapr_irq_init_kvm(xics_kvm_connect, intc, errp);
return spapr_irq_init_kvm(xics_kvm_connect, intc, nr_servers, errp);
}
return 0;
}