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Commit 674e7012 authored by Marc Zyngier's avatar Marc Zyngier Committed by Christoffer Dall
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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: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent 9ac71595

Documentation/arm64/silicon-errata.txt

+1 −0
Original line number Diff line number Diff line
@@ -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    |

arch/arm64/kvm/hyp/switch.c

+1 −1
Original line number Diff line number Diff line
@@ -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);