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KVM: PPC: Book3S HV: Enable use of the new XIVE "single escalation" feature

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That feature, provided by Power9 DD2.0 and later, when supported
by newer OPAL versions, allows us to sacrifice a queue (priority 7)
in favor of merging all the escalation interrupts of the queues
of a single VP into a single interrupt.

This reduces the number of host interrupts used up by KVM guests
especially when those guests use multiple priorities.

It will also enable a future change to control the masking of the
escalation interrupts more precisely to avoid spurious ones.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Benjamin Herrenschmidt 2018-01-12 13:37:12 +11:00 • committed by Paul Mackerras
parent c424c10823
commit bf4159da47
5 changed files with 57 additions and 28 deletions
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1
arch/powerpc/include/asm/opal-api.h
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@ -1073,6 +1073,7 @@ enum {
/* Flags for OPAL_XIVE_GET/SET_VP_INFO */
enum {
OPAL_XIVE_VP_ENABLED = 0x00000001,
OPAL_XIVE_VP_SINGLE_ESCALATION = 0x00000002,
};
/* "Any chip" replacement for chip ID for allocation functions */