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authorCatalin Marinas <catalin.marinas@arm.com>2019-10-28 16:22:49 +0000
committerCatalin Marinas <catalin.marinas@arm.com>2019-10-28 16:22:49 +0000
commit346f6a4636f64c19a27722cf6ec93b38bb4251d4 (patch)
tree0ee2f22a76f5d18ef7003cdab4ef61a1ee1438aa /arch/arm64/Kconfig
parentMerge branch 'for-next/neoverse-n1-stale-instr' into for-next/core (diff)
parentarm64: Enable and document ARM errata 1319367 and 1319537 (diff)
downloadlinux-dev-346f6a4636f64c19a27722cf6ec93b38bb4251d4.tar.xz
linux-dev-346f6a4636f64c19a27722cf6ec93b38bb4251d4.zip
Merge branch 'kvm-arm64/erratum-1319367' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into for-next/core
Similarly to erratum 1165522 that affects Cortex-A76, A57 and A72 respectively suffer from errata 1319537 and 1319367, potentially resulting in TLB corruption if the CPU speculates an AT instruction while switching guests. The fix is slightly more involved since we don't have VHE to help us here, but the idea is the same: when switching a guest in, we must prevent any speculated AT from being able to parse the page tables until S2 is up and running. Only at this stage can we allow AT to take place. For this, we always restore the guest sysregs first, except for its SCTLR and TCR registers, which must be set with SCTLR.M=1 and TCR.EPD{0,1} = {1, 1}, effectively disabling the PTW and TLB allocation. Once S2 is setup, we restore the guest's SCTLR and TCR. Similar things must be done on TLB invalidation... * 'kvm-arm64/erratum-1319367' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms: arm64: Enable and document ARM errata 1319367 and 1319537 arm64: KVM: Prevent speculative S1 PTW when restoring vcpu context arm64: KVM: Disable EL1 PTW when invalidating S2 TLBs arm64: KVM: Reorder system register restoration and stage-2 activation arm64: Add ARM64_WORKAROUND_1319367 for all A57 and A72 versions
Diffstat (limited to 'arch/arm64/Kconfig')
-rw-r--r--arch/arm64/Kconfig10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 56647b995a2b..ea9c6b6c58a0 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -538,6 +538,16 @@ config ARM64_ERRATUM_1286807
invalidated has been observed by other observers. The
workaround repeats the TLBI+DSB operation.
+config ARM64_ERRATUM_1319367
+ bool "Cortex-A57/A72: Speculative AT instruction using out-of-context translation regime could cause subsequent request to generate an incorrect translation"
+ default y
+ help
+ This option adds work arounds for ARM Cortex-A57 erratum 1319537
+ and A72 erratum 1319367
+
+ Cortex-A57 and A72 cores could end-up with corrupted TLBs by
+ speculating an AT instruction during a guest context switch.
+
If unsure, say Y.
config ARM64_ERRATUM_1463225