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linux_dsm_epyc7002/arch/arm64/kvm/hyp
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Julien Thierry bd82d4bd21 arm64: Fix incorrect irqflag restore for priority masking 
When using IRQ priority masking to disable interrupts, in order to deal
with the PSR.I state, local_irq_save() would convert the I bit into a
PMR value (GIC_PRIO_IRQOFF). This resulted in local_irq_restore()
potentially modifying the value of PMR in undesired location due to the
state of PSR.I upon flag saving [1].

In an attempt to solve this issue in a less hackish manner, introduce
a bit (GIC_PRIO_IGNORE_PMR) for the PMR values that can represent
whether PSR.I is being used to disable interrupts, in which case it
takes precedence of the status of interrupt masking via PMR.

GIC_PRIO_PSR_I_SET is chosen such that (<pmr_value> |
GIC_PRIO_PSR_I_SET) does not mask more interrupts than <pmr_value> as
some sections (e.g. arch_cpu_idle(), interrupt acknowledge path)
requires PMR not to mask interrupts that could be signaled to the
CPU when using only PSR.I.

[1] https://www.spinics.net/lists/arm-kernel/msg716956.html

Fixes: 4a503217ce ("arm64: irqflags: Use ICC_PMR_EL1 for interrupt masking")
Cc: <stable@vger.kernel.org> # 5.1.x-
Reported-by: Zenghui Yu <yuzenghui@huawei.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Wei Li <liwei391@huawei.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Christoffer Dall <christoffer.dall@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Suzuki K Pouloze <suzuki.poulose@arm.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2019-06-21 15:50:10 +01:00
..
debug-sr.c KVM: arm64: Repurpose vcpu_arch.debug_flags for general-purpose flags 2018-05-25 12:28:13 +01:00
entry.S KVM: arm/arm64: Context-switch ptrauth registers 2019-04-24 15:30:40 +01:00
fpsimd.S arm64: KVM: Implement fpsimd save/restore 2015-12-14 11:30:41 +00:00
hyp-entry.S arm64: KVM: Drop VHE-specific HYP call stub 2019-02-19 21:05:28 +00:00
Makefile KVM: arm/arm64: Move cc/it checks under hyp's Makefile to avoid instrumentation 2019-05-24 14:53:20 +01:00
switch.c arm64: Fix incorrect irqflag restore for priority masking 2019-06-21 15:50:10 +01:00
sysreg-sr.c ARM: some cleanups, direct physical timer assignment, cache sanitization 2019-03-15 15:00:28 -07:00
tlb.c arm64: KVM: Handle ARM erratum 1165522 in TLB invalidation 2018-12-10 12:20:42 +00:00
vgic-v2-cpuif-proxy.c arm64: KVM: Consistently advance singlestep when emulating instructions 2018-12-18 14:11:37 +00:00