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arm64: Document workaround for Cortex-A72 erratum #853709 

We already have a workaround for Cortex-A57 erratum #852523,
but Cortex-A72 r0p0 to r0p2 do suffer from the same issue
(known as erratum #853709).

Let's document the fact that we already handle this.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
hifive-unleashed-5.1
Marc Zyngier 2016-08-16 15:03:01 +01:00 committed by Christoffer Dall
parent 9ac7159546
commit 674e701270
2 changed files with 2 additions and 1 deletions
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1
Documentation/arm64/silicon-errata.txt
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@ -53,6 +53,7 @@ stable kernels.
| ARM | Cortex-A57 | #832075 | ARM64_ERRATUM_832075 |
| ARM | Cortex-A57 | #852523 | N/A |
| ARM | Cortex-A57 | #834220 | ARM64_ERRATUM_834220 |
| ARM | Cortex-A72 | #853709 | N/A |
| ARM | MMU-500 | #841119,#826419 | N/A |
| | | | |
| Cavium | ThunderX ITS | #22375, #24313 | CAVIUM_ERRATUM_22375 |

2
arch/arm64/kvm/hyp/switch.c
View File

@ -256,7 +256,7 @@ static int __hyp_text __guest_run(struct kvm_vcpu *vcpu)
/*
* We must restore the 32-bit state before the sysregs, thanks
* to Cortex-A57 erratum #852523.
* to erratum #852523 (Cortex-A57) or #853709 (Cortex-A72).
*/
__sysreg32_restore_state(vcpu);
__sysreg_restore_guest_state(guest_ctxt);