> -----Original Message----- > From: Oleksandr Tyshchenko <olekst...@gmail.com> > Sent: 29 January 2021 01:49 > To: xen-devel@lists.xenproject.org > Cc: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com>; Paul Durrant > <p...@xen.org>; Julien Grall > <jul...@xen.org>; Stefano Stabellini <sstabell...@kernel.org>; Andrew Cooper > <andrew.coop...@citrix.com> > Subject: [PATCH V6 23/24] xen/ioreq: Do not let bufioreq to be used on other > than x86 arches > > 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: Paul Durrant <p...@xen.org> > --- > 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; > > -- > 2.7.4
