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Re: [Xen-devel] [PATCH v2 06/13] optee: add domain contexts



Hi,

On 09/03/2018 05:54 PM, Volodymyr Babchuk wrote:
OP-TEE meditor needs to store per-domain context, as will be seen

s/meditor/mediator/

in the next patches. At this moment it stores only reference to domain.

This allows us to filter out calls from domains that are not allowed
to work with OP-TEE.

Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
---
  xen/arch/arm/tee/optee.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 66 insertions(+)

diff --git a/xen/arch/arm/tee/optee.c b/xen/arch/arm/tee/optee.c
index 48bff5d..c895a99 100644
--- a/xen/arch/arm/tee/optee.c
+++ b/xen/arch/arm/tee/optee.c
@@ -19,6 +19,14 @@
  #include <asm/tee/optee_msg.h>
  #include <asm/tee/optee_smc.h>
+struct domain_ctx {

I would prefer if the structure has optee in its name such as optee_domain.

We also tend to abbreviate context in Xen using the ctxt.

+    struct list_head list;
+    struct domain *domain;
+};
+
+static LIST_HEAD(domain_ctx_list);
+static DEFINE_SPINLOCK(domain_ctx_list_lock);
+
  static bool optee_probe(void)
  {
      struct dt_device_node *node;
@@ -41,18 +49,49 @@ static bool optee_probe(void)
      return true;
  }
+static struct domain_ctx *find_domain_ctx(struct domain* d)
+{
+    struct domain_ctx *ctx;
+
+    spin_lock(&domain_ctx_list_lock);
+
+    list_for_each_entry( ctx, &domain_ctx_list, list )
+    {
+        if ( ctx->domain == d )
+        {
+                spin_unlock(&domain_ctx_list_lock);
+                return ctx;
+        }
+    }
+
+    spin_unlock(&domain_ctx_list_lock);
+    return NULL;
+}

Why do you need to store the context in a list? As you have a context per domain it would be better to store that directly in struct domain by introduce a field "void * tee".

With that, most of the code in this patch will become unnecessary. So you potentially can fold it into something else.

Cheers,

--
Julien Grall

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