meta-arm/meta-arm-bsp/recipes-bsp/hafnium/files/tc/0005-feat-vhe-set-STAGE1_NS-while-mapping-memory-from-NWd.patch

From 02c8afc4f7315b4e12098ffeb8bd5e64e4891e78 Mon Sep 17 00:00:00 2001
From: Davidson K <davidson.kumaresan@arm.com>
Date: Thu, 7 Oct 2021 12:20:08 +0530
Subject: [PATCH] feat(vhe): set STAGE1_NS while mapping memory from NWd to SWd

If the memory is shared by a VM executing in non secure world, attribute
MM_MODE_NS had to be set while mapping that in a S-EL0 SP executing in
secure world. It will not be needed for a S-EL1 SP since the NS bit is
available only for the stage 1 translations and the stage 1 translations
for a S-EL1 SP will be handled by a trusted OS running in S-EL1.

Signed-off-by: Davidson K <davidson.kumaresan@arm.com>
Change-Id: I074e2d5a50a659bd3c097d797c4901f08d210b1b
Upstream-Status: Pending [Not submitted to upstream yet]
---
 src/ffa_memory.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/ffa_memory.c b/src/ffa_memory.c
index 048cca9..8910cc7 100644
--- a/src/ffa_memory.c
+++ b/src/ffa_memory.c
@@ -2483,6 +2483,18 @@ struct ffa_value ffa_memory_retrieve(struct vm_locked to_locked,
 
 	memory_to_attributes = ffa_memory_permissions_to_mode(
 		permissions, share_state->sender_orig_mode);
+
+	if (to_locked.vm->el0_partition) {
+		/*
+		 * Get extra mapping attributes for the given VM ID.
+		 * If the memory is shared by a VM executing in non secure
+		 * world, attribute MM_MODE_NS had to be set while mapping
+		 * that in a SP executing in secure world.
+		 */
+		memory_to_attributes |= arch_mm_extra_attributes_from_vm(
+						retrieve_request->sender);
+	}
+
 	ret = ffa_retrieve_check_update(
 		to_locked, memory_region->sender, share_state->fragments,
 		share_state->fragment_constituent_counts,
-- 
2.34.1