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linux-next/arch/powerpc/platforms/powernv
Paul Mackerras 5d375199ea KVM: PPC: Book3S HV: Set server for passed-through interrupts
When a guest has a PCI pass-through device with an interrupt, it
will direct the interrupt to a particular guest VCPU.  In fact the
physical interrupt might arrive on any CPU, and then get
delivered to the target VCPU in the emulated XICS (guest interrupt
controller), and eventually delivered to the target VCPU.

Now that we have code to handle device interrupts in real mode
without exiting to the host kernel, there is an advantage to having
the device interrupt arrive on the same sub(core) as the target
VCPU is running on.  In this situation, the interrupt can be
delivered to the target VCPU without any exit to the host kernel
(using a hypervisor doorbell interrupt between threads if
necessary).

This patch aims to get passed-through device interrupts arriving
on the correct core by setting the interrupt server in the real
hardware XICS for the interrupt to the first thread in the (sub)core
where its target VCPU is running.  We do this in the real-mode H_EOI
code because the H_EOI handler already needs to look at the
emulated ICS state for the interrupt (whereas the H_XIRR handler
doesn't), and we know we are running in the target VCPU context
at that point.

We set the server CPU in hardware using an OPAL call, regardless of
what the IRQ affinity mask for the interrupt says, and without
updating the affinity mask.  This amounts to saying that when an
interrupt is passed through to a guest, as a matter of policy we
allow the guest's affinity for the interrupt to override the host's.

This is inspired by an earlier patch from Suresh Warrier, although
none of this code came from that earlier patch.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
2016-09-12 10:12:28 +10:00
..
eeh-powernv.c powerpc/powernv: Use PCI slot reset infrastructure 2016-06-21 15:30:57 +10:00
idle.c powerpc/powernv: Use deepest stop state when cpu is offlined 2016-07-15 20:18:42 +10:00
Kconfig powerpc/powernv: Add opal-prd channel 2015-06-05 08:32:21 +10:00
Makefile powerpc/powernv: Split cxl code out into a separate file 2016-07-14 20:26:31 +10:00
npu-dma.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
opal-async.c powerpc/opal: Wake up kopald polling thread before waiting for events 2016-07-08 19:53:26 +10:00
opal-dump.c powernv/opal-dump: Convert to irq domain 2015-05-22 15:14:38 +10:00
opal-elog.c powerpc/powernv: Fix opal-elog interrupt handler 2015-07-06 20:24:36 +10:00
opal-flash.c powerpc/powernv: Add interfaces for flash device access 2015-04-11 20:49:21 +10:00
opal-hmi.c powerpc/powernv: Use the "unknown" checkstop type as a fallback 2016-04-11 20:30:40 +10:00
opal-irqchip.c powerpc/xics: Properly set Edge/Level type and enable resend 2016-08-09 14:50:18 +10:00
opal-kmsg.c powerpc/powernv: Fix OPAL_CONSOLE_FLUSH prototype and usages 2016-01-13 12:35:17 +11:00
opal-lpc.c powerpc/powernv: Properly fix LPC debugfs endianness 2014-10-31 17:09:04 +11:00
opal-memory-errors.c powerpc/powernv: Fix spelling mistake "Retrived" -> "Retrieved" 2016-06-28 13:52:18 +10:00
opal-msglog.c powerpc/powernv: don't create OPAL msglog sysfs entry if memcons init fails 2016-02-22 20:31:55 +11:00
opal-nvram.c powerpc/powernv: Add pstore support on powernv 2015-03-23 14:06:10 +11:00
opal-power.c powerpc/powernv: Add poweroff (EPOW, DPO) events support for PowerNV platform 2015-07-16 13:34:36 +10:00
opal-prd.c powerpc/powernv: Drop owner assignment from platform_driver 2015-11-24 14:21:28 +11:00
opal-rtc.c powerpc/powernv: Only delay opal_rtc_read() retry when necessary 2015-12-27 19:12:40 +11:00
opal-sensor.c powerpc/opal: Add inline function to get rc from an ASYNC_COMP opal_msg 2016-06-29 17:33:18 +10:00
opal-sysparam.c powerpc/opal: Add inline function to get rc from an ASYNC_COMP opal_msg 2016-06-29 17:33:18 +10:00
opal-tracepoints.c powerpc: Introduce asm-prototypes.h 2016-06-16 22:39:54 +10:00
opal-wrappers.S KVM: PPC: Book3S HV: Set server for passed-through interrupts 2016-09-12 10:12:28 +10:00
opal-xscom.c powerpc/powernv: remove FW_FEATURE_OPALv3 and just use FW_FEATURE_OPAL 2015-12-17 22:40:54 +11:00
opal.c powerpc/book3s: Fix MCE console messages for unrecoverable MCE. 2016-08-09 19:46:54 +10:00
pci-cxl.c powerpc/powernv: Fix pci-cxl.c build when CONFIG_MODULES=n 2016-07-19 20:12:28 +10:00
pci-ioda.c powerpc/powernv: Provide facilities for EOI, usable from real mode 2016-09-09 16:17:59 +10:00
pci.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
pci.h dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
powernv.h powerpc/powernv: Use deepest stop state when cpu is offlined 2016-07-15 20:18:42 +10:00
rng.c powerpc: Use hardware RNG for arch_get_random_seed_* not arch_get_random_* 2015-07-23 19:52:03 +10:00
setup.c powerpc: Get rid of ppc_md.init_early() 2016-07-21 19:07:26 +10:00
smp.c powerpc/powernv: Use deepest stop state when cpu is offlined 2016-07-15 20:18:42 +10:00
subcore-asm.S powerpc/powernv: Add support for POWER8 split core on powernv 2014-05-28 13:35:37 +10:00
subcore.c powerpc/powernv: Create separate subcores CPU feature bit 2016-02-22 20:47:46 +11:00
subcore.h powernv/powerpc: Add winkle support for offline cpus 2014-12-15 10:46:41 +11:00