AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/arch/arm
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Marc Zyngier 92f35b751c KVM: arm/arm64: vgic: Allow more than 256 vcpus for KVM_IRQ_LINE 
While parts of the VGIC support a large number of vcpus (we
bravely allow up to 512), other parts are more limited.

One of these limits is visible in the KVM_IRQ_LINE ioctl, which
only allows 256 vcpus to be signalled when using the CPU or PPI
types. Unfortunately, we've cornered ourselves badly by allocating
all the bits in the irq field.

Since the irq_type subfield (8 bit wide) is currently only taking
the values 0, 1 and 2 (and we have been careful not to allow anything
else), let's reduce this field to only 4 bits, and allocate the
remaining 4 bits to a vcpu2_index, which acts as a multiplier:

  vcpu_id = 256 * vcpu2_index + vcpu_index

With that, and a new capability (KVM_CAP_ARM_IRQ_LINE_LAYOUT_2)
allowing this to be discovered, it becomes possible to inject
PPIs to up to 4096 vcpus. But please just don't.

Whilst we're there, add a clarification about the use of KVM_IRQ_LINE
on arm, which is not completely conditionned by KVM_CAP_IRQCHIP.

Reported-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
2019-09-09 12:29:09 +01:00
..
boot i.MX fixes for 5.3: 2019-07-23 10:13:24 -07:00
common docs: arm: convert docs to ReST and rename to *.rst 2019-07-15 09:20:24 -03:00
configs ARM: defconfig: u8500: Add new drivers 2019-07-23 10:13:13 -07:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2019-07-08 20:57:08 -07:00
include KVM: arm/arm64: vgic: Allow more than 256 vcpus for KVM_IRQ_LINE 2019-09-09 12:29:09 +01:00
kernel ARM: signal: Mark expected switch fall-through 2019-08-09 19:47:15 -05:00
kvm KVM: arm: Don't write junk to CP15 registers on reset 2019-08-09 08:07:24 +01:00
lib ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-actions
mach-alpine
mach-artpec treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-asm9260
mach-aspeed
mach-at91 ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-axxia treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-bcm ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-berlin
mach-clps711x
mach-cns3xxx
mach-davinci ARM: davinci: fix sleep.S build error on ARMv4 2019-07-23 10:12:53 -07:00
mach-digicolor treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-dove
mach-ebsa110 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-efm32
mach-ep93xx ARM: ep93xx: Mark expected switch fall-through 2019-08-09 19:53:35 -05:00
mach-exynos ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-footbridge treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-gemini
mach-highbank ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-hisi treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-imx ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-integrator treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-iop13xx
mach-iop32x Merge branch 'i2c/for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-07-15 21:10:39 -07:00
mach-iop33x treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-ixp4xx docs: arm: convert docs to ReST and rename to *.rst 2019-07-15 09:20:24 -03:00
mach-keystone ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-ks8695 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-lpc18xx
mach-lpc32xx
mach-mediatek
mach-meson
mach-milbeaut
mach-mmp treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 506 2019-06-19 17:11:22 +02:00
mach-moxart
mach-mv78xx0
mach-mvebu
mach-mxs treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-nomadik
mach-npcm
mach-nspire treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-omap1 Driver Core and debugfs changes for 5.3-rc1 2019-07-12 12:24:03 -07:00
mach-omap2 ARM: SoC-related driver updates 2019-07-19 17:13:56 -07:00
mach-orion5x
mach-oxnas treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-picoxcell treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-prima2
mach-pxa ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-qcom treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-rda
mach-realview treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-rockchip
mach-rpc ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-s3c24xx docs: arm: convert docs to ReST and rename to *.rst 2019-07-15 09:20:24 -03:00
mach-s3c64xx Merge branch 'regulator-5.3' into regulator-next 2019-07-04 17:34:32 +01:00
mach-s5pv210
mach-sa1100 ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-shmobile
mach-socfpga treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-spear treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-sti treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-stm32 ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
mach-sunxi
mach-tango ARM: use arch_extension directive instead of arch argument 2019-06-19 09:44:25 -07:00
mach-tegra ARM: tegra: Mark expected switch fall-through 2019-08-09 19:45:22 -05:00
mach-u300
mach-uniphier
mach-ux500 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-versatile
mach-vexpress treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-vt8500
mach-w90x900 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-zx treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mach-zynq treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
mm Wimplicit-fallthrough patches for 5.3-rc4 2019-08-10 10:10:33 -07:00
net
nwfpe
oprofile
plat-iop Merge branch 'i2c/for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2019-07-15 21:10:39 -07:00
plat-omap ARM: OMAP: dma: Mark expected switch fall-throughs 2019-08-09 19:45:41 -05:00
plat-orion
plat-pxa treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
plat-samsung docs: arm: convert docs to ReST and rename to *.rst 2019-07-15 09:20:24 -03:00
plat-versatile treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
probes treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
tools docs: arm: convert docs to ReST and rename to *.rst 2019-07-15 09:20:24 -03:00
vdso kbuild: add --hash-style= and --build-id unconditionally 2019-07-17 22:37:51 +09:00
vfp treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
xen
Kconfig ARM: SoC platform updates 2019-07-19 17:05:08 -07:00
Kconfig-nommu
Kconfig.debug ARM: Delete netx a second time 2019-07-21 20:03:11 -07:00
Makefile