[PATCH v4 14/17] KVM: arm64: FFA: Remove access of endpoint memory access descriptor array

[Sudeep Holla]

FF-A v1.1 removes the fixed location of endpoint memory access descriptor
array within the memory transaction descriptor structure. In preparation
to remove the ep_mem_access member from the ffa_mem_region structure,
provide the accessor to fetch the offset and use the same in FF-A proxy
implementation.

The accessor take the FF-A version as the argument from which the memory
access descriptor format can be determined. v1.0 uses the old format while
v1.1 onwards use the new format specified in the v1.1 specification.

Cc: Marc Zyngier <maz at kernel.org>
Cc: Oliver Upton <oliver.upton at linux.dev>
Cc: Will Deacon <will at kernel.org>
Cc: Quentin Perret <qperret at google.com>
Signed-off-by: Sudeep Holla <sudeep.holla at arm.com>
---
 arch/arm64/kvm/hyp/nvhe/ffa.c | 10 ++++++++--
 include/linux/arm_ffa.h       |  6 ++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c
index 6e4dba9eadef..320f2eaa14a9 100644
--- a/arch/arm64/kvm/hyp/nvhe/ffa.c
+++ b/arch/arm64/kvm/hyp/nvhe/ffa.c
@@ -423,6 +423,7 @@ static __always_inline void do_ffa_mem_xfer(const u64 func_id,
 	DECLARE_REG(u32, fraglen, ctxt, 2);
 	DECLARE_REG(u64, addr_mbz, ctxt, 3);
 	DECLARE_REG(u32, npages_mbz, ctxt, 4);
+	struct ffa_mem_region_attributes *ep_mem_access;
 	struct ffa_composite_mem_region *reg;
 	struct ffa_mem_region *buf;
 	u32 offset, nr_ranges;
@@ -452,7 +453,9 @@ static __always_inline void do_ffa_mem_xfer(const u64 func_id,
 	buf = hyp_buffers.tx;
 	memcpy(buf, host_buffers.tx, fraglen);
 
-	offset = buf->ep_mem_access[0].composite_off;
+	ep_mem_access = (void *)buf +
+			ffa_mem_desc_offset(buf, 0, FFA_VERSION_1_0);
+	offset = ep_mem_access->composite_off;
 	if (!offset || buf->ep_count != 1 || buf->sender_id != HOST_FFA_ID) {
 		ret = FFA_RET_INVALID_PARAMETERS;
 		goto out_unlock;
@@ -504,6 +507,7 @@ static void do_ffa_mem_reclaim(struct arm_smccc_res *res,
 	DECLARE_REG(u32, handle_lo, ctxt, 1);
 	DECLARE_REG(u32, handle_hi, ctxt, 2);
 	DECLARE_REG(u32, flags, ctxt, 3);
+	struct ffa_mem_region_attributes *ep_mem_access;
 	struct ffa_composite_mem_region *reg;
 	u32 offset, len, fraglen, fragoff;
 	struct ffa_mem_region *buf;
@@ -528,7 +532,9 @@ static void do_ffa_mem_reclaim(struct arm_smccc_res *res,
 	len = res->a1;
 	fraglen = res->a2;
 
-	offset = buf->ep_mem_access[0].composite_off;
+	ep_mem_access = (void *)buf +
+			ffa_mem_desc_offset(buf, 0, FFA_VERSION_1_0);
+	offset = ep_mem_access->composite_off;
 	/*
 	 * We can trust the SPMD to get this right, but let's at least
 	 * check that we end up with something that doesn't look _completely_
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index 748d0a83a4bc..2444d596b703 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -357,6 +357,12 @@ struct ffa_mem_region {
 #define CONSTITUENTS_OFFSET(x)	\
 	(offsetof(struct ffa_composite_mem_region, constituents[x]))
 
+static inline u32
+ffa_mem_desc_offset(struct ffa_mem_region *buf, int count, u32 ffa_version)
+{
+	return COMPOSITE_OFFSET(0);
+}
+
 struct ffa_mem_ops_args {
 	bool use_txbuf;
 	u32 nattrs;

-- 
2.42.0