[Xen-devel] [PATCH v9 17/18] grant-table: call set_phys_to_machine after mapping grant refs

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

When mapping/unmapping grant refs, call
set_phys_to_machine to update the P2M with the new mappings for
autotranslate guests.
This is (almost) a nop on x86.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Changes in v9:
- add in-code comments.
---
 drivers/xen/grant-table.c |   19 +++++++++++++++++--
 1 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index c4d2298..62ccf54 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -49,6 +49,7 @@
 #include <xen/grant_table.h>
 #include <xen/interface/memory.h>
 #include <xen/hvc-console.h>
+#include <xen/swiotlb-xen.h>
 #include <asm/xen/hypercall.h>
 #include <asm/xen/interface.h>
 
@@ -898,8 +899,16 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
                        gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, map_ops 
+ i,
                                                &map_ops[i].status, __func__);
 
-       if (xen_feature(XENFEAT_auto_translated_physmap))
+       /* this is basically a nop on x86 */
+       if (xen_feature(XENFEAT_auto_translated_physmap)) {
+               for (i = 0; i < count; i++) {
+                       if (map_ops[i].status)
+                               continue;
+                       set_phys_to_machine(map_ops[i].host_addr >> PAGE_SHIFT,
+                                       map_ops[i].dev_bus_addr >> PAGE_SHIFT);
+               }
                return ret;
+       }
 
        if (!in_interrupt() && paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE) {
                arch_enter_lazy_mmu_mode();
@@ -942,8 +951,14 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref 
*unmap_ops,
        if (ret)
                return ret;
 
-       if (xen_feature(XENFEAT_auto_translated_physmap))
+       /* this is basically a nop on x86 */
+       if (xen_feature(XENFEAT_auto_translated_physmap)) {
+               for (i = 0; i < count; i++) {
+                       set_phys_to_machine(unmap_ops[i].host_addr >> 
PAGE_SHIFT,
+                                       INVALID_P2M_ENTRY);
+               }
                return ret;
+       }
 
        if (!in_interrupt() && paravirt_get_lazy_mode() == PARAVIRT_LAZY_NONE) {
                arch_enter_lazy_mmu_mode();
-- 
1.7.2.5


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