x86/xen: add reschedule point when mapping foreign GFNs

Mapping a large range of foreign GFNs can take a long time, add a
reschedule point after each batch of 16 GFNs.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
(cherry picked from commit 914beb9fc26d6225295b8315ab54026f8f22755c)
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 9c479fe4045912d9152315bc1fa4af9ed334304b..ac161db633885872fdebdce976d05b978e1235da 100644 (file)
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -2888,6 +2888,7 @@ static int do_remap_gfn(struct vm_area_struct *vma,
                addr += range;
                if (err_ptr)
                        err_ptr += batch;
+               cond_resched();
        }
 out: