From a373930ec9406aeb9f82b5b78db56ca8d0919d99 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Fri, 23 Jan 2026 19:16:35 +0000 Subject: [PATCH] KVM: arm64: Switch pKVM host S2 over to KVM_PGTABLE_S2_AS_S1 Since we have the basics to use the S1 memory attributes as the final ones with FWB, flip the host over to that when FWB is present. Reviewed-by: Joey Gouly Tested-by: Fuad Tabba Reviewed-by: Fuad Tabba Link: https://patch.msgid.link/20260123191637.715429-4-maz@kernel.org Signed-off-by: Marc Zyngier --- arch/arm64/kvm/hyp/nvhe/mem_protect.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c index 49db32f3ddf71..38f66a56a7665 100644 --- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c +++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c @@ -19,7 +19,7 @@ #include #include -#define KVM_HOST_S2_FLAGS (KVM_PGTABLE_S2_NOFWB | KVM_PGTABLE_S2_IDMAP) +#define KVM_HOST_S2_FLAGS (KVM_PGTABLE_S2_AS_S1 | KVM_PGTABLE_S2_IDMAP) struct host_mmu host_mmu; @@ -324,6 +324,8 @@ int __pkvm_prot_finalize(void) params->vttbr = kvm_get_vttbr(mmu); params->vtcr = mmu->vtcr; params->hcr_el2 |= HCR_VM; + if (cpus_have_final_cap(ARM64_HAS_STAGE2_FWB)) + params->hcr_el2 |= HCR_FWB; /* * The CMO below not only cleans the updated params to the -- 2.47.3