Rob Herring 96d389ca10 arm64: Add workaround for Arm Cortex-A77 erratum 1508412 ...

On Cortex-A77 r0p0 and r1p0, a sequence of a non-cacheable or device load
and a store exclusive or PAR_EL1 read can cause a deadlock.

The workaround requires a DMB SY before and after a PAR_EL1 register
read. In addition, it's possible an interrupt (doing a device read) or
KVM guest exit could be taken between the DMB and PAR read, so we
also need a DMB before returning from interrupt and before returning to
a guest.

A deadlock is still possible with the workaround as KVM guests must also
have the workaround. IOW, a malicious guest can deadlock an affected
systems.

This workaround also depends on a firmware counterpart to enable the h/w
to insert DMB SY after load and store exclusive instructions. See the
errata document SDEN-1152370 v10 [1] for more information.

[1] https://static.docs.arm.com/101992/0010/Arm_Cortex_A77_MP074_Software_Developer_Errata_Notice_v10.pdf

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: kvmarm@lists.cs.columbia.edu
Link: https://lore.kernel.org/r/20201028182839.166037-2-robh@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

2020-10-29 12:56:01 +00:00

..

hyp

arm64: Add workaround for Arm Cortex-A77 erratum 1508412

2020-10-29 12:56:01 +00:00

vgic

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2020-10-23 11:17:56 -07:00

aarch32.c

KVM: arm64: Synchronize sysreg state on injecting an AArch32 exception

2020-06-10 16:04:08 +01:00

arch_timer.c

KVM: arm64: timers: Move timer registers to the sys_regs file

2020-07-07 09:28:38 +01:00

arm.c

arm64: Add workaround for Arm Cortex-A77 erratum 1508412

2020-10-29 12:56:01 +00:00

debug.c

KVM: arm64: Write arch.mdcr_el2 changes since last vcpu_load on VHE

2020-01-22 18:38:04 +00:00

fpsimd.c

KVM: arm64: Make struct kvm_regs userspace-only

2020-07-07 09:28:38 +01:00

guest.c

KVM: arm64: Move SPSR_EL1 to the system register array

2020-07-07 09:28:38 +01:00

handle_exit.c

treewide: Use fallthrough pseudo-keyword

2020-08-23 17:36:59 -05:00

hypercalls.c

KVM: arm64: ARM_SMCCC_ARCH_WORKAROUND_1 doesn't return SMCCC_RET_NOT_REQUIRED

2020-10-28 11:13:36 +00:00

inject_fault.c

KVM: arm64: Fix inject_fault.c kernel-doc warnings

2020-09-18 16:17:22 +01:00

irq.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 422

2019-06-05 17:37:15 +02:00

Kconfig

KVM: arm64: Replace CONFIG_KVM_INDIRECT_VECTORS with CONFIG_RANDOMIZE_BASE

2020-09-29 16:08:15 +01:00

Makefile

KVM: arm64: nVHE: Migrate hyp-init to SMCCC

2020-09-15 18:39:04 +01:00

mmio.c

Merge tag 'kvmarm-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into kvm-next-5.6

2020-08-09 12:58:23 -04:00

mmu.c

Merge tag 'kvmarm-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD

2020-10-20 08:14:25 -04:00

perf.c

KVM: arm64: Move virt/kvm/arm to arch/arm64

2020-05-16 15:03:59 +01:00

pmu-emul.c

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2020-10-23 11:17:56 -07:00

pmu.c

kvm: arm64: Set up hyp percpu data for nVHE

2020-09-30 08:37:14 +01:00

psci.c

KVM: arm64: Convert ARCH_WORKAROUND_2 to arm64_get_spectre_v4_state()

2020-09-29 16:08:17 +01:00

pvtime.c

arm64/x86: KVM: Introduce steal-time cap

2020-08-21 14:05:19 +01:00

regmap.c

KVM: arm64: Move SPSR_EL1 to the system register array

2020-07-07 09:28:38 +01:00

reset.c

Merge branch 'kvm-arm64/hyp-pcpu' into kvmarm-master/next

2020-09-30 14:05:35 +01:00

sys_regs.c

arm64: Add workaround for Arm Cortex-A77 erratum 1508412

2020-10-29 12:56:01 +00:00

sys_regs.h

KVM: arm64: Remove the target table

2020-07-05 18:20:45 +01:00

trace_arm.h

KVM: arm64: Fix address truncation in traces

2020-09-04 10:53:48 +01:00

trace_handle_exit.h

KVM: arm64: Fix address truncation in traces

2020-09-04 10:53:48 +01:00

trace.h

KVM: arm64: Move virt/kvm/arm to arch/arm64

2020-05-16 15:03:59 +01:00

va_layout.c

KVM: arm64: Make nVHE ASLR conditional on RANDOMIZE_BASE

2020-07-28 10:41:11 +01:00

vgic-sys-reg-v3.c

KVM: arm64: Move virt/kvm/arm to arch/arm64

2020-05-16 15:03:59 +01:00