Hi Oleksandr,
On 29/01/2021 01:48, Oleksandr Tyshchenko wrote:
From: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com>
This patch prevents the device model running on other than x86
systems to use buffered I/O feature for now.
Please note, there is no caller which requires to send buffered
I/O request on Arm currently and the purpose of this check is
to catch any future user of bufioreq.
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com>
Acked-by: Julien Grall <jgr...@amazon.com>
Cheers,
---
Please note, this is a split/cleanup/hardening of Julien's PoC:
"Add support for Guest IO forwarding to a device emulator"
Changes V5 -> V6:
- new patch
---
---
xen/common/ioreq.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/xen/common/ioreq.c b/xen/common/ioreq.c
index 67ef1f7..a36137d 100644
--- a/xen/common/ioreq.c
+++ b/xen/common/ioreq.c
@@ -629,6 +629,9 @@ static int ioreq_server_create(struct domain *d, int
bufioreq_handling,
unsigned int i;
int rc;
+ if ( !IS_ENABLED(CONFIG_X86) && bufioreq_handling )
+ return -EINVAL;
+
if ( bufioreq_handling > HVM_IOREQSRV_BUFIOREQ_ATOMIC )
return -EINVAL;
--
Julien Grall
