[PATCH] xen/arm: optee: Allocate anonymous domheap pages

[Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>]

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>

Allocate anonymous domheap pages as there is no strict need to
account them to a particular domain.

Since XSA-383 "xen/arm: Restrict the amount of memory that dom0less
domU and dom0 can allocate" the dom0 cannot allocate memory outside
of the pre-allocated region. This means if we try to allocate
non-anonymous page to be accounted to dom0 we will get an
over-allocation issue when assigning that page to the domain.
The anonymous page, in turn, is not assigned to any domain.

CC: Julien Grall <jgrall@xxxxxxxxxx>
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
Acked-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
---
 xen/arch/arm/tee/optee.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/xen/arch/arm/tee/optee.c b/xen/arch/arm/tee/optee.c
index 3453615..83b4994 100644
--- a/xen/arch/arm/tee/optee.c
+++ b/xen/arch/arm/tee/optee.c
@@ -410,7 +410,7 @@ static struct shm_rpc *allocate_and_pin_shm_rpc(struct 
optee_domain *ctx,
     if ( !shm_rpc )
         return ERR_PTR(-ENOMEM);
 
-    shm_rpc->xen_arg_pg = alloc_domheap_page(current->domain, 0);
+    shm_rpc->xen_arg_pg = alloc_domheap_page(NULL, 0);
     if ( !shm_rpc->xen_arg_pg )
     {
         xfree(shm_rpc);
@@ -774,7 +774,7 @@ static int translate_noncontig(struct optee_domain *ctx,
      * - There is a plan to implement preemption in the code below, which
      *   will allow use to increase default MAX_SHM_BUFFER_PG value.
      */
-    xen_pgs = alloc_domheap_pages(current->domain, order, 0);
+    xen_pgs = alloc_domheap_pages(NULL, order, 0);
     if ( !xen_pgs )
         return -ENOMEM;
 
@@ -938,7 +938,7 @@ static bool copy_std_request(struct cpu_user_regs *regs,
 
     BUILD_BUG_ON(OPTEE_MSG_NONCONTIG_PAGE_SIZE > PAGE_SIZE);
 
-    call->xen_arg_pg = alloc_domheap_page(current->domain, 0);
+    call->xen_arg_pg = alloc_domheap_page(NULL, 0);
     if ( !call->xen_arg_pg )
     {
         set_user_reg(regs, 0, OPTEE_SMC_RETURN_ENOMEM);
-- 
2.7.4