[PULL 09/12] arm64: Document workaround for Cortex-A72 erratum #853709
From: Christoffer Dall <hidden>
Date: 2016-08-17 19:38:56
Also in:
kvm, kvmarm
Subsystem:
arm64 port (aarch64 architecture), documentation, kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Jonathan Corbet, Marc Zyngier, Oliver Upton, Linus Torvalds
From: Marc Zyngier <redacted> 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 <redacted> Signed-off-by: Marc Zyngier <redacted> Signed-off-by: Christoffer Dall <redacted> --- Documentation/arm64/silicon-errata.txt | 1 + arch/arm64/kvm/hyp/switch.c | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/Documentation/arm64/silicon-errata.txt b/Documentation/arm64/silicon-errata.txt
index 4da60b4..ccc6032 100644
--- a/Documentation/arm64/silicon-errata.txt
+++ b/Documentation/arm64/silicon-errata.txt@@ -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 |
diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index ae7855f..5a84b45 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c@@ -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);
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2.9.0