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authorPaul Durrant <paul.durrant@citrix.com>2018-05-09 14:16:12 +0100
committerJuergen Gross <jgross@suse.com>2018-05-14 15:25:37 +0200
commit3ad0876554cafa368f574d4d408468510543e9ff (patch)
tree7fade80924630151265270e68355d3f68b029bad /arch/arm
parent4bf2cc9645599382e34b7d0cbe5a13d0de98194e (diff)
downloadlinux-3ad0876554cafa368f574d4d408468510543e9ff.tar.bz2
xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE
My recent Xen patch series introduces a new HYPERVISOR_memory_op to support direct priv-mapping of certain guest resources (such as ioreq pages, used by emulators) by a tools domain, rather than having to access such resources via the guest P2M. This patch adds the necessary infrastructure to the privcmd driver and Xen MMU code to support direct resource mapping. NOTE: The adjustment in the MMU code is partially cosmetic. Xen will now allow a PV tools domain to map guest pages either by GFN or MFN, thus the term 'mfn' has been swapped for 'pfn' in the lower layers of the remap code. Signed-off-by: Paul Durrant <paul.durrant@citrix.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/xen/enlighten.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index ba7f4c8f5c3e..8073625371f5 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -89,6 +89,17 @@ int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
}
EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
+/* Not used by XENFEAT_auto_translated guests. */
+int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
+ unsigned long addr,
+ xen_pfn_t *mfn, int nr,
+ int *err_ptr, pgprot_t prot,
+ unsigned int domid, struct page **pages)
+{
+ return -ENOSYS;
+}
+EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array);
+
static void xen_read_wallclock(struct timespec64 *ts)
{
u32 version;