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	ARM:	2020-10-23 11:17:56 -07:00
aarch32.c
arch_timer.c
arm.c	arm64: Add workaround for Arm Cortex-A77 erratum 1508412	2020-10-29 12:56:01 +00:00
debug.c
fpsimd.c
guest.c
handle_exit.c
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
irq.h
Kconfig
Makefile
mmio.c
mmu.c	KVM/arm64 updates for Linux 5.10	2020-10-20 08:14:25 -04:00
perf.c
pmu-emul.c	ARM:	2020-10-23 11:17:56 -07:00
pmu.c
psci.c
pvtime.c
regmap.c
reset.c
sys_regs.c	arm64: Add workaround for Arm Cortex-A77 erratum 1508412	2020-10-29 12:56:01 +00:00
sys_regs.h
trace_arm.h
trace_handle_exit.h
trace.h
va_layout.c
vgic-sys-reg-v3.c