AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/arch
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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
..
alpha local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
arc local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
arm ARM: OMAP2+: omap_device: fix idling of devices during probe 2021-01-17 14:16:59 +01:00
arm64 KVM: arm64: Don't access PMCR_EL0 when no PMU is available 2021-01-17 14:17:05 +01:00
c6x arch-cleanup-2020-10-22 2020-10-23 10:06:38 -07:00
csky local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
h8300 local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
hexagon local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
ia64 local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
m68k local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
microblaze local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
mips local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
nds32 local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
nios2 sched/idle: Fix arch_cpu_idle() vs tracing 2020-11-24 16:47:35 +01:00
openrisc sched/idle: Fix arch_cpu_idle() vs tracing 2020-11-24 16:47:35 +01:00
parisc local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
powerpc powerpc/32s: Fix RTAS machine check with VMAP stack 2021-01-17 14:16:52 +01:00
riscv local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
s390 local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
sh local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
sparc local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
um um: ubd: Submit all data segments atomically 2021-01-06 14:56:55 +01:00
x86 fanotify: Fix sys_fanotify_mark() on native x86-32 2021-01-17 14:16:59 +01:00
xtensa local64.h: make <asm/local64.h> mandatory 2021-01-12 20:18:16 +01:00
.gitignore
Kconfig fanotify: Fix sys_fanotify_mark() on native x86-32 2021-01-17 14:16:59 +01:00