From: Per Larsen via B4 Relay <devnull+perlarsen.google.com@kernel.org>
To: Marc Zyngier <maz@kernel.org>, Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Yeoreum Yun <yeoreum.yun@arm.com>,
Ben Horgan <ben.horgan@arm.com>,
Oliver Upton <oupton@kernel.org>
Cc: Armelle Laine <armellel@google.com>,
Sebastien Ene <sebastianene@google.com>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
linux-kernel@vger.kernel.org, Per Larsen <perlarsen@google.com>
Subject: [PATCH v5 0/2] KVM: arm64: Support FF-A direct messaging interfaces
Date: Wed, 21 Jan 2026 08:27:11 +0000 [thread overview]
Message-ID: <20260121-host-direct-messages-v5-0-2c1614c94e80@google.com> (raw)
Support FFA_MSG_SEND_DIRECT_REQ unconditionally.
Support FFA_MSG_SEND_DIRECT_REQ2 if hypervisor negotiated version 1.2+.
Framework messages (FF-A control plane) are filtered out. For
FFA_MSG_SEND_DIRECT_REQ, we look at flags in w2. Messages using the REQ2
interface are always partition messages.
The second patch was part of a previous patch set [0] but was dropped
since the use case was unclear. A clear use case has now appeared: use
TPM device with CRB over FF-A when kernel boots with pkvm [1].
Tested by booting Android under QEMU.
Best Regards,
Per
[0]: https://lore.kernel.org/all/20250730-virtio-msg-ffa-v9-0-7f1b55c8d149@google.com/
[1]: https://lore.kernel.org/all/20251027191729.1704744-1-yeoreum.yun@arm.com/
Signed-off-by: Per Larsen <perlarsen@google.com>
---
Changes in v5:
- 1/2: do_ffa_direct_msg: validate that sender is HOST_FFA_ID.
- Link to v4: https://lore.kernel.org/r/20260109-host-direct-messages-v4-0-95da4221d186@google.com
Changes in v4:
- 1/2: do_ffa_direct_msg: check that flag in w2 is zero; drop unused vm_handle parameter.
- 2/2: ffa_call_supported: simplify logic by reordering cases.
- do_ffa_direct_msg: switch polarity of check and update comment.
- Link to v3: https://lore.kernel.org/r/20251119-host-direct-messages-v3-0-c74d04944b26@google.com
Changes in v3:
- Filter out framework messages as suggested by Will Deacon. Update cover letter accordingly.
- Update trailers: Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
- Link to v2: https://lore.kernel.org/r/20251030-host-direct-messages-v2-0-9f27cef36730@google.com
Changes in v2:
- 1/2: Drop support for FFA_ID_GET interface in host handler.
- Link to v1: https://lore.kernel.org/r/20251030-host-direct-messages-v1-0-463e57871c8f@google.com
---
Per Larsen (1):
KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ2 in host handler
Sebastian Ene (1):
KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ in host handler
arch/arm64/kvm/hyp/nvhe/ffa.c | 39 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)
---
base-commit: 6c790212c588fddeb0d852f2790840753bb604b1
change-id: 20251029-host-direct-messages-5201d7f55abd
Best regards,
--
Per Larsen <perlarsen@google.com>
next reply other threads:[~2026-01-21 8:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-21 8:27 Per Larsen via B4 Relay [this message]
2026-01-21 8:27 ` [PATCH v5 1/2] KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ in host handler Per Larsen via B4 Relay
2026-01-23 12:55 ` Will Deacon
2026-05-01 2:18 ` Per Larsen
2026-01-21 8:27 ` [PATCH v5 2/2] KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ2 " Per Larsen via B4 Relay
2026-04-30 21:40 ` [PATCH v5 0/2] KVM: arm64: Support FF-A direct messaging interfaces Yeoreum Yun
2026-05-01 2:30 ` Per Larsen
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