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 23/28] KVM: arm64: nv: Set access flag on table descriptors at stage-2
Date: Fri, 23 Oct 2026 13:56:05 -0700 [thread overview]
Message-ID: <20261023205610.1044532-24-oupton@kernel.org> (raw)
In-Reply-To: <20261023205610.1044532-1-oupton@kernel.org>
Implement access flag updates on table descriptors as required by
FEAT_HAFT.
Reviewed-by: Leonardo Bras <leo.bras@arm.com>
Signed-off-by: Oliver Upton <oupton@kernel.org>
---
arch/arm64/kvm/nested.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index eb20409a14b1..5ae818a70ae2 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -152,6 +152,7 @@ struct s2_walk_info {
bool be;
bool ha;
bool hd;
+ bool haft;
};
struct s2_walk_step {
@@ -253,12 +254,15 @@ static bool should_set_access_flag(struct s2_walk_info *wi, struct s2_walk_step
if (access->type == WALK_ACCESS_NONARCH)
return false;
- return wi->ha;
+ return kvm_pte_table(ws->desc, ws->level) ? wi->haft : wi->ha;
}
static bool should_set_dirty_state(struct s2_walk_info *wi, struct s2_walk_step *ws,
struct kvm_s2_trans *out, struct kvm_walk_access *access)
{
+ if (kvm_pte_table(ws->desc, ws->level))
+ return false;
+
switch (access->type) {
/* R_ZYGHJ */
case WALK_ACCESS_CMO:
@@ -447,6 +451,10 @@ static int walk_nested_s2_pgd(struct kvm_vcpu *vcpu, struct kvm_walk_access *acc
return 1;
}
+ ret = handle_desc_update(vcpu, wi, &ws, out, access);
+ if (ret)
+ return ret;
+
base_addr = ws.desc & GENMASK_ULL(47, wi->pgshift);
ws.level += 1;
@@ -585,6 +593,7 @@ static void setup_s2_walk(struct kvm_vcpu *vcpu, struct s2_walk_info *wi)
wi->ha = vtcr & VTCR_EL2_HA;
wi->be = vcpu_read_sys_reg(vcpu, SCTLR_EL2) & SCTLR_ELx_EE;
wi->hd = wi->ha && (vtcr & VTCR_EL2_HD);
+ wi->haft = wi->ha && (vtcr & VTCR_EL2_HAFT);
}
int kvm_walk_nested_s2(struct kvm_vcpu *vcpu, struct kvm_walk_access *access,
--
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 ` [PATCH v2 21/28] KVM: arm64: nv: Expose FEAT_HAFDBS Oliver Upton
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 ` Oliver Upton [this message]
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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