From: Per Larsen via B4 Relay <devnull+perlarsen.google.com@kernel.org>
To: Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
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>,
Sudeep Holla <sudeep.holla@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
linux-kernel@vger.kernel.org, ahomescu@google.com,
armellel@google.com, arve@android.com, ayrton@google.com,
qperret@google.com, sebastianene@google.com, qwandor@google.com,
Per Larsen <perlarsen@google.com>
Subject: [PATCH v11 5/6] KVM: arm64: Mask response to FFA_FEATURE call
Date: Wed, 20 Aug 2025 01:10:09 +0000 [thread overview]
Message-ID: <20250820-virtio-msg-ffa-v11-5-497ef43550a3@google.com> (raw)
In-Reply-To: <20250820-virtio-msg-ffa-v11-0-497ef43550a3@google.com>
From: Per Larsen <perlarsen@google.com>
The minimum size and alignment boundary for FFA_RXTX_MAP is returned in
bit[1:0]. Mask off any other bits in w2 when reading the minimum buffer
size in hyp_ffa_post_init.
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Per Larsen <perlarsen@google.com>
---
arch/arm64/kvm/hyp/nvhe/ffa.c | 2 +-
include/linux/arm_ffa.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c
index 96109aa99c48741e45a2b85d8e7bf26440597398..a8ec1a94f3f8a86551895f4606918246c4ac1f39 100644
--- a/arch/arm64/kvm/hyp/nvhe/ffa.c
+++ b/arch/arm64/kvm/hyp/nvhe/ffa.c
@@ -739,7 +739,7 @@ static int hyp_ffa_post_init(void)
if (res.a0 != FFA_SUCCESS)
return -EOPNOTSUPP;
- switch (res.a2) {
+ switch (res.a2 & FFA_FEAT_RXTX_MIN_SZ_MASK) {
case FFA_FEAT_RXTX_MIN_SZ_4K:
min_rxtx_sz = SZ_4K;
break;
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index e1634897e159cdc208931938649eb0fb04d5a070..cd7ee4df9045dceca1c4e0dca2d533b770b1b056 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -128,6 +128,7 @@
#define FFA_FEAT_RXTX_MIN_SZ_4K 0
#define FFA_FEAT_RXTX_MIN_SZ_64K 1
#define FFA_FEAT_RXTX_MIN_SZ_16K 2
+#define FFA_FEAT_RXTX_MIN_SZ_MASK GENMASK(1, 0)
/* FFA Bus/Device/Driver related */
struct ffa_device {
--
2.51.0.rc1.167.g924127e9c0-goog
next prev parent reply other threads:[~2025-08-20 1:18 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-20 1:10 [PATCH v11 0/6] KVM: arm64: Support FF-A 1.2 Per Larsen via B4 Relay
2025-08-20 1:10 ` [PATCH v11 1/6] KVM: arm64: Correct return value on host version downgrade attempt Per Larsen via B4 Relay
2025-08-20 1:10 ` [PATCH v11 2/6] KVM: arm64: Use SMCCC 1.2 for FF-A initialization and in host handler Per Larsen via B4 Relay
2025-08-20 1:10 ` [PATCH v11 3/6] KVM: arm64: Mark FFA_NOTIFICATION_* calls as unsupported Per Larsen via B4 Relay
2025-08-20 1:10 ` [PATCH v11 4/6] KVM: arm64: Mark optional FF-A 1.2 interfaces " Per Larsen via B4 Relay
2025-08-20 1:10 ` Per Larsen via B4 Relay [this message]
2025-08-20 1:10 ` [PATCH v11 6/6] KVM: arm64: Bump the supported version of FF-A to 1.2 Per Larsen via B4 Relay
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