From: Oliver Upton <oupton@kernel.org>
To: kvmarm@lists.linux.dev
Cc: Marc Zyngier <maz@kernel.org>, Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Wei-Lin Chang <weilin.chang@arm.com>,
Steffen Eiden <seiden@linux.ibm.com>,
Fuad Tabba <fuad.tabba@linux.dev>,
Leonardo Bras <leo.bras@arm.com>,
Oliver Upton <oupton@kernel.org>
Subject: [PATCH v2 21/28] KVM: arm64: nv: Expose FEAT_HAFDBS
Date: Fri, 23 Oct 2026 13:56:03 -0700 [thread overview]
Message-ID: <20261023205610.1044532-22-oupton@kernel.org> (raw)
In-Reply-To: <20261023205610.1044532-1-oupton@kernel.org>
Everything is in place now to support hardware dirty state management.
Flip the corresponding bit and advertise the feature to the guest.
Reviewed-by: Leonardo Bras <leo.bras@arm.com>
Signed-off-by: Oliver Upton <oupton@kernel.org>
---
arch/arm64/kvm/nested.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index 46fcc75f4c20..eb20409a14b1 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -2040,7 +2040,12 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val)
if (test_bit(KVM_ARM_VCPU_HAS_EL2_E2H0, kvm->arch.vcpu_features))
val &= ~ID_AA64MMFR1_EL1_VH;
- val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR1_EL1, HAFDBS, AF);
+ /* FEAT_S2FWB implies IDC */
+ if (cpus_have_final_cap(ARM64_HAS_STAGE2_FWB) &&
+ cpus_have_final_cap(ARM64_HAS_CACHE_DIC))
+ val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR1_EL1, HAFDBS, DBM);
+ else
+ val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR1_EL1, HAFDBS, AF);
break;
case SYS_ID_AA64MMFR2_EL1:
--
2.47.3
next prev parent reply other threads:[~2026-10-23 20:57 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-23 20:55 [PATCH v2 00/28] KVM: arm64: nv: Implement FEAT_HAFDBS, FEAT_HAFT Oliver Upton
2026-10-23 20:55 ` [PATCH v2 01/28] KVM: arm64: nv: Introduce struct for stage-2 walk step Oliver Upton
2026-10-23 20:55 ` [PATCH v2 02/28] KVM: arm64: nv: Consolidate computation of stage-2 permissions Oliver Upton
2026-10-23 20:55 ` [PATCH v2 03/28] KVM: arm64: nv: Get rid of kvm_s2_trans*() accessors Oliver Upton
2026-10-23 20:55 ` [PATCH v2 04/28] KVM: arm64: nv: Only shadow writable-dirty guest descs as writable Oliver Upton
2026-10-23 21:25 ` sashiko-bot
2026-10-24 6:26 ` Oliver Upton
2026-10-23 20:55 ` [PATCH v2 05/28] KVM: arm64: nv: Pass an access descriptor for stage-2 walks Oliver Upton
2026-10-23 20:55 ` [PATCH v2 06/28] KVM: arm64: nv: Use a helper for stage-2 descriptor updates Oliver Upton
2026-10-23 20:55 ` [PATCH v2 07/28] KVM: arm64: nv: Set dirty state at stage-2 Oliver Upton
2026-10-23 20:55 ` [PATCH v2 08/28] KVM: arm64: nv: Treat DBM as writable " Oliver Upton
2026-10-23 20:55 ` [PATCH v2 09/28] KVM: arm64: Compute S1 permissions as part of s1_walk() Oliver Upton
2026-10-23 20:55 ` [PATCH v2 10/28] KVM: arm64: Plumb through access descriptor for stage-1 Oliver Upton
2026-10-23 21:06 ` sashiko-bot
2026-10-23 20:55 ` [PATCH v2 11/28] KVM: arm64: Use a struct for stage-1 walk context Oliver Upton
2026-10-23 20:55 ` [PATCH v2 12/28] KVM: arm64: Create helper for stage-1 descriptor updates Oliver Upton
2026-10-23 20:55 ` [PATCH v2 13/28] KVM: arm64: Set dirty state at stage-1 Oliver Upton
2026-10-23 20:55 ` [PATCH v2 14/28] KVM: arm64: nv: Respect HA when computing translated TCR Oliver Upton
2026-10-23 20:55 ` [PATCH v2 15/28] KVM: arm64: nv: Respect HD " Oliver Upton
2026-10-23 20:55 ` [PATCH v2 16/28] KVM: arm64: Grant write permission when DBM is set at S1 Oliver Upton
2026-10-23 20:55 ` [PATCH v2 17/28] KVM: arm64: Don't update descriptors for "non-arch" access Oliver Upton
2026-10-23 20:56 ` [PATCH v2 18/28] KVM: arm64: nv: Emulate CMOs via writable-clean translations as NOPs Oliver Upton
2026-10-23 20:56 ` [PATCH v2 19/28] arm64: Add command line switch to disable FEAT_S2FWB Oliver Upton
2026-10-23 20:56 ` [PATCH v2 20/28] KVM: arm64: Reject non-coherent DMA when using forced writeback Oliver Upton
2026-10-23 21:16 ` sashiko-bot
2026-10-23 20:56 ` Oliver Upton [this message]
2026-10-23 20:56 ` [PATCH v2 22/28] KVM: arm64: Set Access flag on table descriptors at stage-1 Oliver Upton
2026-10-23 21:22 ` sashiko-bot
2026-10-24 6:24 ` Oliver Upton
2026-10-23 20:56 ` [PATCH v2 23/28] KVM: arm64: nv: Set access flag on table descriptors at stage-2 Oliver Upton
2026-10-23 20:56 ` [PATCH v2 24/28] KVM: arm64: nv: Expose FEAT_HAFT Oliver Upton
2026-10-23 20:56 ` [PATCH v2 25/28] KVM: arm64: selftests: Only test AF behavior for emulated AT insns Oliver Upton
2026-10-23 20:56 ` [PATCH v2 26/28] KVM: arm64: selftests: Test AT emulation for FEAT_HAFT Oliver Upton
2026-10-23 20:56 ` [PATCH v2 27/28] KVM: arm64: Add tracepoints for S1 page table walk Oliver Upton
2026-10-23 20:56 ` [PATCH v2 28/28] KVM: arm64: Add tracepoints for S2 " Oliver Upton
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