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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2018-01-12 03:37:12 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2018-01-19 02:10:21 +0100 |
| commit | bf4159da4751ab8eea43ca6e7c49193dbce8398c (patch) | |
| tree | f388b8cce6117fd8dd3d592dfa18d7d290ea35a9 /arch/powerpc/include/asm/opal-api.h | |
| parent | KVM: PPC: Book3S HV: Add more info about XIVE queues in debugfs (diff) | |
| download | linux-bf4159da4751ab8eea43ca6e7c49193dbce8398c.tar.xz linux-bf4159da4751ab8eea43ca6e7c49193dbce8398c.zip | |
KVM: PPC: Book3S HV: Enable use of the new XIVE "single escalation" feature
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>
Diffstat (limited to 'arch/powerpc/include/asm/opal-api.h')
| -rw-r--r-- | arch/powerpc/include/asm/opal-api.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h index 233c7504b1f2..fc926743647e 100644 --- a/arch/powerpc/include/asm/opal-api.h +++ b/arch/powerpc/include/asm/opal-api.h @@ -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 */ |