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KVM/arm64 fixes for 5.9, take #3

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- Fix synchronization of VTTBR update on TLB invalidation for nVHE systems
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Merge tag 'kvmarm-fixes-5.9-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into kvm-master

KVM/arm64 fixes for 5.9, take #3

- Fix synchronization of VTTBR update on TLB invalidation for nVHE systems
This commit is contained in:
Paolo Bonzini 2020-10-03 05:07:59 -04:00
commit e2e1a1c86b
1 changed files with 7 additions and 0 deletions
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7
arch/arm64/kvm/hyp/nvhe/tlb.c
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@ -31,7 +31,14 @@ static void __tlb_switch_to_guest(struct kvm_s2_mmu *mmu,
isb();
}
/*
* __load_guest_stage2() includes an ISB only when the AT
* workaround is applied. Take care of the opposite condition,
* ensuring that we always have an ISB, but not two ISBs back
* to back.
*/
__load_guest_stage2(mmu);
asm(ALTERNATIVE("isb", "nop", ARM64_WORKAROUND_SPECULATIVE_AT));
}
static void __tlb_switch_to_host(struct tlb_inv_context *cxt)