From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org
Cc: Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Oliver Upton <oupton@kernel.org>,
Zenghui Yu <yuzenghui@huawei.com>, Will Deacon <will@kernel.org>,
Quentin Perret <qperret@google.com>,
Fuad Tabba <tabba@google.com>
Subject: [PATCH 4/6] KVM: arm64: Switch pKVM host S2 over to KVM_PGTABLE_S2_AS_S1
Date: Mon, 19 Jan 2026 10:56:49 +0000 [thread overview]
Message-ID: <20260119105651.255693-5-maz@kernel.org> (raw)
In-Reply-To: <20260119105651.255693-1-maz@kernel.org>
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.
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
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 <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
--
2.47.3
next prev parent reply other threads:[~2026-01-19 10:57 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-19 10:56 [PATCH 0/6] KVM: arm64: ... and FWB for all Marc Zyngier
2026-01-19 10:56 ` [PATCH 1/6] arm64: Add MT_S2{,_FWB}_AS_S1 encodings Marc Zyngier
2026-01-22 15:07 ` Fuad Tabba
2026-01-19 10:56 ` [PATCH 2/6] KVM: arm64: Add KVM_PGTABLE_S2_AS_S1 flag Marc Zyngier
2026-01-22 15:08 ` Fuad Tabba
2026-01-22 17:05 ` Will Deacon
2026-01-19 10:56 ` [PATCH 3/6] KVM: arm64: Make stage2_pte_cacheable() return false when S2_AS_S1 is set Marc Zyngier
2026-01-22 15:04 ` Will Deacon
2026-01-23 13:21 ` Marc Zyngier
2026-01-19 10:56 ` Marc Zyngier [this message]
2026-01-22 15:09 ` [PATCH 4/6] KVM: arm64: Switch pKVM host S2 over to KVM_PGTABLE_S2_AS_S1 Fuad Tabba
2026-01-19 10:56 ` [PATCH 5/6] KVM: arm64: Kill KVM_PGTABLE_S2_NOFWB Marc Zyngier
2026-01-22 15:09 ` Fuad Tabba
2026-01-19 10:56 ` [PATCH 6/6] KVM: arm64: Simplify PAGE_S2_MEMATTR Marc Zyngier
2026-01-22 15:03 ` Will Deacon
2026-01-21 16:23 ` [PATCH 0/6] KVM: arm64: ... and FWB for all Joey Gouly
2026-01-21 18:13 ` Fuad Tabba
2026-01-23 12:22 ` Alexandru Elisei
2026-01-23 12:37 ` Marc Zyngier
2026-01-23 15:17 ` Alexandru Elisei
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