AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/arch/arm64
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Marc Zyngier 610e2c5699 KVM: arm64: Don't access PMCR_EL0 when no PMU is available 
commit 2a5f1b67ec577fb1544b563086e0377f095f88e2 upstream.

We reset the guest's view of PMCR_EL0 unconditionally, based on
the host's view of this register. It is however legal for an
implementation not to provide any PMU, resulting in an UNDEF.

The obvious fix is to skip the reset of this shadow register
when no PMU is available, sidestepping the issue entirely.
If no PMU is available, the guest is not able to request
a virtual PMU anyway, so not doing nothing is the right thing
to do!

It is unlikely that this bug can hit any HW implementation
though, as they all provide a PMU. It has been found using nested
virt with the host KVM not implementing the PMU itself.

Fixes: ab9468340d ("arm64: KVM: Add access handler for PMCR register")
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201210083059.1277162-1-maz@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-17 14:17:05 +01:00
..
boot arm64: dts: marvell: keep SMMU disabled by default for Armada 7040 and 8040 2020-12-30 11:54:14 +01:00
configs arm64: defconfig: Build in CONFIG_GPIO_MXC by default 2020-10-26 15:48:58 +08:00
crypto crypto: arm64/poly1305-neon - reorder PAC authentication with SP update 2020-12-30 11:53:02 +01:00
include arm64: mm: Fix ARCH_LOW_ADDRESS_LIMIT when !CONFIG_ZONE_DMA 2021-01-17 14:17:02 +01:00
kernel arm64: cpufeature: remove non-exist CONFIG_KVM_ARM_HOST 2021-01-17 14:17:04 +01:00
kvm KVM: arm64: Don't access PMCR_EL0 when no PMU is available 2021-01-17 14:17:05 +01:00
lib arm64: Change .weak to SYM_FUNC_START_WEAK_PI for arch/arm64/lib/mem*.S 2020-10-30 08:32:31 +00:00
mm arm64: mm: Fix ARCH_LOW_ADDRESS_LIMIT when !CONFIG_ZONE_DMA 2021-01-17 14:17:02 +01:00
net
xen
Kbuild
Kconfig kbuild: Hoist '--orphan-handling' into Kconfig 2020-12-01 22:45:36 +09:00
Kconfig.debug
Kconfig.platforms arm64: berlin: Select DW_APB_TIMER_OF 2020-10-26 10:45:03 +01:00
Makefile arm64: link with -z norelro for LLD or aarch64-elf 2021-01-12 20:18:24 +01:00