Marc Zyngier c5fe50e18f KVM: arm64: Don't access PMCR_EL0 when no PMU is available ... commit 2a5f1b67ec 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 14:05:38 +01:00
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boot	arm64: dts: meson: g12a: x96-max: fix PHY deassert timing requirements	2020-12-30 11:51:20 +01:00
configs	arm64/ARM: configs: Change CONFIG_REMOTEPROC from m to y	2019-09-30 11:48:00 -07:00
crypto	crypto: arch/nhpoly1305 - process in explicit 4k chunks	2020-05-14 07:58:25 +02:00
include	KVM: arm64: Introduce handling of AArch32 TTBCR2 traps	2020-12-30 11:51:38 +01:00
kernel	arm64: syscall: exit userspace before unmasking exceptions	2020-12-30 11:50:57 +01:00
kvm	KVM: arm64: Don't access PMCR_EL0 when no PMU is available	2021-01-17 14:05:38 +01:00
lib	arm64: Change .weak to SYM_FUNC_START_WEAK_PI for arch/arm64/lib/mem*.S	2020-11-10 12:37:24 +01:00
mm	arm64/mm: return cpu_all_mask when node is NUMA_NO_NODE	2020-11-05 11:43:18 +01:00
net	arm64: bpf: Fix branch offset in JIT	2020-09-23 12:40:42 +02:00
xen	xen/efi: have a common runtime setup function	2019-10-02 10:31:07 -04:00
Kbuild	arm64: add arch/arm64/Kbuild	2019-08-21 18:47:15 +01:00
Kconfig	arm64: errata: Hide CTR_EL0.DIC on systems affected by Neoverse-N1 #1542419	2020-04-29 16:32:56 +02:00
Kconfig.debug	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Kconfig.platforms	arm64: berlin: Select DW_APB_TIMER_OF	2020-11-05 11:43:36 +01:00
Makefile	arm64: link with -z norelro regardless of CONFIG_RELOCATABLE	2020-11-01 12:01:02 +01:00