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Commit 5ebc77de authored by Stefano Stabellini's avatar Stefano Stabellini
Browse files

xen/arm: introduce XENFEAT_grant_map_identity 



The flag tells us that the hypervisor maps a grant page to guest
physical address == machine address of the page in addition to the
normal grant mapping address. It is needed to properly issue cache
maintenance operation at the completion of a DMA operation involving a
foreign grant.

Signed-off-by: default avatarStefano Stabellini <stefano.stabellini@eu.citrix.com>
Tested-by: default avatarDenis Schneider <v1ne2go@gmail.com>
parent 0b5a5063

arch/arm/xen/enlighten.c

+6 −0
Original line number Diff line number Diff line
@@ -260,6 +260,12 @@ static int __init xen_guest_init(void) 
	xen_domain_type = XEN_HVM_DOMAIN;



	xen_setup_features();



	if (!xen_feature(XENFEAT_grant_map_identity)) {

		pr_warn("Please upgrade your Xen.\n"

				"If your platform has any non-coherent DMA devices, they won't work properly.\n");

	}



	if (xen_feature(XENFEAT_dom0))

		xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;

	else

include/xen/interface/features.h

+3 −0
Original line number Diff line number Diff line
@@ -53,6 +53,9 @@ 
/* operation as Dom0 is supported */

#define XENFEAT_dom0                      11



/* Xen also maps grant references at pfn = mfn */

#define XENFEAT_grant_map_identity        12



#define XENFEAT_NR_SUBMAPS 1



#endif /* __XEN_PUBLIC_FEATURES_H__ */