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spapr/xive: Add a 'hv-prio' property to represent the KVM escalation priority

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On POWER9, the KVM XIVE device uses priority 7 for the escalation
interrupts. On POWER10, the host can use a reduced set of priorities
and KVM will configure the escalation priority to a lower number. In
any case, the guest is allowed to use priorities in a single range :

    [ 0 .. (maxprio - 1) ].

Introduce a 'hv-prio' property to represent the escalation priority
number and use it to compute the "ibm,plat-res-int-priorities"
property defining the priority ranges reserved by the hypervisor.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20200819130843.2230799-2-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Cédric Le Goater 2020-08-19 15:08:36 +02:00 • committed by David Gibson
parent 98b49b2bea
commit 4f311a7089
2 changed files with 16 additions and 19 deletions
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2
include/hw/ppc/spapr_xive.h
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@ -49,6 +49,8 @@ typedef struct SpaprXive {
void *tm_mmap;
MemoryRegion tm_mmio_kvm;
VMChangeStateEntry *change;
uint8_t hv_prio;
} SpaprXive;
typedef struct SpaprXiveClass {