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Re: [RFC PATCH V1 08/12] xen/arm: Invalidate qemu mapcache on XENMEM_decrease_reservation



Hi Jan,

On 05/08/2020 17:21, Jan Beulich wrote:
On 03.08.2020 20:21, Oleksandr Tyshchenko wrote:
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -1652,6 +1652,12 @@ long do_memory_op(unsigned long cmd, 
XEN_GUEST_HANDLE_PARAM(void) arg)
          break;
      }
+ /* x86 already sets the flag in hvm_memory_op() */
+#if defined(CONFIG_ARM64) && defined(CONFIG_IOREQ_SERVER)
+    if ( op == XENMEM_decrease_reservation )
+        curr_d->arch.hvm.qemu_mapcache_invalidate = true;
+#endif

Doesn't the comment already indicate a route towards an approach
not requiring to alter common code?

Given that IOREQ is now moved under common/, I think it would make sense to have this set in common code as well for all the architecture.

IOW, I would suggest to drop the #ifdef CONFIG_ARM64. In addition, we may want to introduce an helper to check if a domain is using ioreq.

Cheers,

--
Julien Grall



 


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