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KVM: arm64: Switch pKVM host S2 over to KVM_PGTABLE_S2_AS_S1

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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 <joey.gouly@arm.com>
Tested-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260123191637.715429-4-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2026-01-23 19:16:35 +00:00
parent 17d7b15131
commit a373930ec9
1 changed files with 3 additions and 1 deletions
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4
arch/arm64/kvm/hyp/nvhe/mem_protect.c
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@ -19,7 +19,7 @@
#include <nvhe/mem_protect.h>
#include <nvhe/mm.h>
#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