Hello!
The first patch fixes an issue reported by Sami, where linux panic()s when bringing secondary CPUs online. The problem was the Spectre workarounds trying to allocate a new slot for mitigating KVM when those pages are no longer writeable.
While debugging that issue, I spotted the Spectre-BHB KVM mitigation was over-riding the Spectre-v2 KVM Mitigation. It's supposed to happen the other way round.
The backports aren't the same as mainline because the spectre mitigation code was totally rewritten for v5.10, and prior to that the KVM infrastructure is very different.
Thanks,
James Morse (2): arm64: Fix panic() when Spectre-v2 causes Spectre-BHB to re-allocate KVM vectors arm64: errata: Fix KVM Spectre-v2 mitigation selection for Cortex-A57/A72
arch/arm64/kernel/cpu_errata.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-)