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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [for-4.7 v3 1/2] xen: XENMEM_add_to_physmap_batch: Mark 'foreign_id' as reserved for dev_mmio
The field 'foreign_id' is not used when the space is dev_mmio. As the
space is not yet part of the stable ABI, the field is marked as reserved
for future use.
The value should always be 0, other values will return -EOPNOTSUPP.
Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
---
Changes in v3:
- s/add_to_physmap_batch_extra/xen_add_to_physmap_batch_extra/
- Add a comment in compat
Changes in v2:
- Return -EOPNOTSUPP rather than -ENOSYS
- Introduce a union in the structure xenmem_add_to_physmap_batch
---
xen/arch/arm/mm.c | 9 +++++++--
xen/arch/x86/mm.c | 4 ++--
xen/common/compat/memory.c | 7 +++++++
xen/common/memory.c | 12 +++++++++---
xen/include/public/memory.h | 10 +++++++++-
xen/include/xen/mm.h | 3 ++-
6 files changed, 36 insertions(+), 9 deletions(-)
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index b46e23e..0aa8092 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1047,7 +1047,7 @@ void share_xen_page_with_privileged_guests(
int xenmem_add_to_physmap_one(
struct domain *d,
unsigned int space,
- domid_t foreign_domid,
+ union xen_add_to_physmap_batch_extra extra,
unsigned long idx,
xen_pfn_t gpfn)
{
@@ -1103,7 +1103,8 @@ int xenmem_add_to_physmap_one(
{
struct domain *od;
p2m_type_t p2mt;
- od = rcu_lock_domain_by_any_id(foreign_domid);
+
+ od = rcu_lock_domain_by_any_id(extra.foreign_domid);
if ( od == NULL )
return -ESRCH;
@@ -1143,6 +1144,10 @@ int xenmem_add_to_physmap_one(
break;
}
case XENMAPSPACE_dev_mmio:
+ /* extra should be 0. Reserved for future use. */
+ if ( extra.res0 )
+ return -EOPNOTSUPP;
+
rc = map_dev_mmio_region(d, gpfn, 1, idx);
return rc;
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 03a4d5b..8d10a3e 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4769,7 +4769,7 @@ static int handle_iomem_range(unsigned long s, unsigned
long e, void *p)
int xenmem_add_to_physmap_one(
struct domain *d,
unsigned int space,
- domid_t foreign_domid,
+ union xen_add_to_physmap_batch_extra extra,
unsigned long idx,
xen_pfn_t gpfn)
{
@@ -4830,7 +4830,7 @@ int xenmem_add_to_physmap_one(
break;
}
case XENMAPSPACE_gmfn_foreign:
- return p2m_add_foreign(d, idx, gpfn, foreign_domid);
+ return p2m_add_foreign(d, idx, gpfn, extra.foreign_domid);
default:
break;
}
diff --git a/xen/common/compat/memory.c b/xen/common/compat/memory.c
index 19a914d..20c7671 100644
--- a/xen/common/compat/memory.c
+++ b/xen/common/compat/memory.c
@@ -253,6 +253,13 @@ int compat_memory_op(unsigned int cmd,
XEN_GUEST_HANDLE_PARAM(void) compat)
unsigned int size = cmp.atpb.size;
xen_ulong_t *idxs = (void *)(nat.atpb + 1);
xen_pfn_t *gpfns = (void *)(idxs + limit);
+ /*
+ * The union will always be 16-bit width. So it is not
+ * necessary to have the exact field which correspond to the
+ * space.
+ */
+ enum XLAT_add_to_physmap_batch_u u =
+ XLAT_add_to_physmap_batch_u_res0;
if ( copy_from_guest(&cmp.atpb, compat, 1) ||
!compat_handle_okay(cmp.atpb.idxs, size) ||
diff --git a/xen/common/memory.c b/xen/common/memory.c
index 644f81a..ccc6436 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -639,9 +639,15 @@ static int xenmem_add_to_physmap(struct domain *d,
{
unsigned int done = 0;
long rc = 0;
+ union xen_add_to_physmap_batch_extra extra;
+
+ if ( xatp->space != XENMAPSPACE_gmfn_foreign )
+ extra.res0 = 0;
+ else
+ extra.foreign_domid = DOMID_INVALID;
if ( xatp->space != XENMAPSPACE_gmfn_range )
- return xenmem_add_to_physmap_one(d, xatp->space, DOMID_INVALID,
+ return xenmem_add_to_physmap_one(d, xatp->space, extra,
xatp->idx, xatp->gpfn);
if ( xatp->size < start )
@@ -658,7 +664,7 @@ static int xenmem_add_to_physmap(struct domain *d,
while ( xatp->size > done )
{
- rc = xenmem_add_to_physmap_one(d, xatp->space, DOMID_INVALID,
+ rc = xenmem_add_to_physmap_one(d, xatp->space, extra,
xatp->idx, xatp->gpfn);
if ( rc < 0 )
break;
@@ -719,7 +725,7 @@ static int xenmem_add_to_physmap_batch(struct domain *d,
}
rc = xenmem_add_to_physmap_one(d, xatpb->space,
- xatpb->foreign_domid,
+ xatpb->u,
idx, gpfn);
if ( unlikely(__copy_to_guest_offset(xatpb->errs, 0, &rc, 1)) )
diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index fe52ee1..5f7e0d2 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -259,7 +259,15 @@ struct xen_add_to_physmap_batch {
/* Number of pages to go through */
uint16_t size;
- domid_t foreign_domid; /* IFF gmfn_foreign */
+
+#if __XEN_INTERFACE_VERSION__ < 0x00040700
+ domid_t foreign_domid; /* IFF gmfn_foreign. Should be 0 for other spaces.
*/
+#else
+ union xen_add_to_physmap_batch_extra {
+ domid_t foreign_domid; /* gmfn_foreign */
+ uint16_t res0; /* All the other spaces. Should be 0 */
+ } u;
+#endif
/* Indexes into space being mapped. */
XEN_GUEST_HANDLE(xen_ulong_t) idxs;
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index d4721fc..3cf646a 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -50,6 +50,7 @@
#include <xen/list.h>
#include <xen/spinlock.h>
#include <xen/typesafe.h>
+#include <public/memory.h>
TYPE_SAFE(unsigned long, mfn);
#define PRI_mfn "05lx"
@@ -505,7 +506,7 @@ void scrub_one_page(struct page_info *);
#endif
int xenmem_add_to_physmap_one(struct domain *d, unsigned int space,
- domid_t foreign_domid,
+ union xen_add_to_physmap_batch_extra extra,
unsigned long idx, xen_pfn_t gpfn);
/* Returns 1 on success, 0 on error, negative if the ring
--
1.9.1
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