[xen staging] xen/arm: static-shmem: request host address to be specified for 1:1 domains

[patchbot@xxxxxxx]

commit c56f1ef577831ec70645ca5874d54f2e698c6761
Author:     Michal Orzel <michal.orzel@xxxxxxx>
AuthorDate: Fri Jun 21 11:22:05 2024 +0200
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Mon Jun 24 17:55:06 2024 +0100

    xen/arm: static-shmem: request host address to be specified for 1:1 domains
    
    As a follow up to commit cb1ddafdc573 ("xen/arm/static-shmem: Static-shmem
    should be direct-mapped for direct-mapped domains") add a check to
    request that both host and guest physical address must be supplied for
    direct mapped domains. Otherwise return an error to prevent unwanted
    behavior.
    
    Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
    Fixes: 988f1c7e1f40 ("xen/arm: static-shmem: fix "gbase/pbase used  
uninitialized" build failure")
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
    Release-Acked-By: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 xen/arch/arm/static-shmem.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/xen/arch/arm/static-shmem.c b/xen/arch/arm/static-shmem.c
index cd48d2896b..aa80756c3c 100644
--- a/xen/arch/arm/static-shmem.c
+++ b/xen/arch/arm/static-shmem.c
@@ -378,6 +378,13 @@ int __init process_shm(struct domain *d, struct 
kernel_info *kinfo,
             const struct membank *alloc_bank =
                 find_shm_bank_by_id(get_shmem_heap_banks(), shm_id);
 
+            if ( is_domain_direct_mapped(d) )
+            {
+                printk("%pd: host and guest physical address must be supplied 
for direct-mapped domains\n",
+                       d);
+                return -EINVAL;
+            }
+
             /* guest phys address is right at the beginning */
             gbase = dt_read_paddr(cells, addr_cells);
 
--
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