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
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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	arm64: bpf: Fix branch offset in JIT	2020-09-17 12:05:36 +01:00
xen	arm64: xen: Use modern annotations for assembly functions	2020-01-09 16:09:42 +00:00
Kbuild	arm64: add arch/arm64/Kbuild	2019-08-21 18:47:15 +01:00
Kconfig	kbuild: Hoist '--orphan-handling' into Kconfig	2020-12-01 22:45:36 +09:00
Kconfig.debug	arm64: remove TEXT_OFFSET randomization	2020-06-15 13:10:59 +01:00
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