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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 2/5] xen: move XENMAPSPACE_grant_table code into grant_table.c
The x86 and arm versions of XENMAPSPACE_grant_table handling are nearly
identical. Move the code into a function in grant_table.c and add an
architecture dependant hook to handle the differences.
This at once fixes a bug in the arm code which didn't unlock the grant
table in error case.
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
xen/arch/arm/mm.c | 34 ++++----------------------------
xen/arch/x86/mm.c | 41 ++++++++++-----------------------------
xen/common/grant_table.c | 38 ++++++++++++++++++++++++++++++++++++
xen/include/asm-arm/grant_table.h | 6 ++++++
xen/include/asm-x86/grant_table.h | 5 +++++
xen/include/xen/grant_table.h | 3 +++
6 files changed, 66 insertions(+), 61 deletions(-)
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index a810a056d7..6dad167a8e 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -24,6 +24,7 @@
#include <xen/mm.h>
#include <xen/preempt.h>
#include <xen/errno.h>
+#include <xen/sched.h>
#include <xen/grant_table.h>
#include <xen/softirq.h>
#include <xen/event.h>
@@ -34,7 +35,6 @@
#include <asm/current.h>
#include <asm/flushtlb.h>
#include <public/memory.h>
-#include <xen/sched.h>
#include <xen/vmap.h>
#include <xsm/xsm.h>
#include <xen/pfn.h>
@@ -1229,37 +1229,11 @@ int xenmem_add_to_physmap_one(
switch ( space )
{
case XENMAPSPACE_grant_table:
- grant_write_lock(d->grant_table);
-
- if ( d->grant_table->gt_version == 0 )
- d->grant_table->gt_version = 1;
-
- if ( d->grant_table->gt_version == 2 &&
- (idx & XENMAPIDX_grant_table_status) )
- {
- idx &= ~XENMAPIDX_grant_table_status;
- if ( idx < nr_status_frames(d->grant_table) )
- mfn = virt_to_mfn(d->grant_table->status[idx]);
- else
- return -EINVAL;
- }
- else
- {
- if ( (idx >= nr_grant_frames(d->grant_table)) &&
- (idx < max_grant_frames) )
- gnttab_grow_table(d, idx + 1);
-
- if ( idx < nr_grant_frames(d->grant_table) )
- mfn = virt_to_mfn(d->grant_table->shared_raw[idx]);
- else
- return -EINVAL;
- }
-
- d->arch.grant_table_gfn[idx] = gfn;
+ rc = gnttab_map_frame(d, idx, gfn, &mfn);
+ if ( rc )
+ return rc;
t = p2m_ram_rw;
-
- grant_write_unlock(d->grant_table);
break;
case XENMAPSPACE_shared_info:
if ( idx != 0 )
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index ed77270586..e339987c01 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4601,40 +4601,19 @@ int xenmem_add_to_physmap_one(
{
struct page_info *page = NULL;
unsigned long gfn = 0; /* gcc ... */
- unsigned long prev_mfn, mfn = 0, old_gpfn;
+ unsigned long prev_mfn, old_gpfn;
int rc = 0;
+ mfn_t mfn = INVALID_MFN;
p2m_type_t p2mt;
switch ( space )
{
case XENMAPSPACE_shared_info:
if ( idx == 0 )
- mfn = virt_to_mfn(d->shared_info);
+ mfn = _mfn(virt_to_mfn(d->shared_info));
break;
case XENMAPSPACE_grant_table:
- grant_write_lock(d->grant_table);
-
- if ( d->grant_table->gt_version == 0 )
- d->grant_table->gt_version = 1;
-
- if ( d->grant_table->gt_version == 2 &&
- (idx & XENMAPIDX_grant_table_status) )
- {
- idx &= ~XENMAPIDX_grant_table_status;
- if ( idx < nr_status_frames(d->grant_table) )
- mfn = virt_to_mfn(d->grant_table->status[idx]);
- }
- else
- {
- if ( (idx >= nr_grant_frames(d->grant_table)) &&
- (idx < max_grant_frames) )
- gnttab_grow_table(d, idx + 1);
-
- if ( idx < nr_grant_frames(d->grant_table) )
- mfn = virt_to_mfn(d->grant_table->shared_raw[idx]);
- }
-
- grant_write_unlock(d->grant_table);
+ gnttab_map_frame(d, idx, gpfn, &mfn);
break;
case XENMAPSPACE_gmfn_range:
case XENMAPSPACE_gmfn:
@@ -4651,8 +4630,8 @@ int xenmem_add_to_physmap_one(
}
if ( !get_page_from_mfn(_mfn(idx), d) )
break;
- mfn = idx;
- page = mfn_to_page(_mfn(mfn));
+ mfn = _mfn(idx);
+ page = mfn_to_page(mfn);
break;
}
case XENMAPSPACE_gmfn_foreign:
@@ -4661,7 +4640,7 @@ int xenmem_add_to_physmap_one(
break;
}
- if ( !paging_mode_translate(d) || (mfn == 0) )
+ if ( !paging_mode_translate(d) || mfn_eq(mfn, INVALID_MFN) )
{
rc = -EINVAL;
goto put_both;
@@ -4685,16 +4664,16 @@ int xenmem_add_to_physmap_one(
goto put_both;
/* Unmap from old location, if any. */
- old_gpfn = get_gpfn_from_mfn(mfn);
+ old_gpfn = get_gpfn_from_mfn(mfn_x(mfn));
ASSERT( old_gpfn != SHARED_M2P_ENTRY );
if ( space == XENMAPSPACE_gmfn || space == XENMAPSPACE_gmfn_range )
ASSERT( old_gpfn == gfn );
if ( old_gpfn != INVALID_M2P_ENTRY )
- rc = guest_physmap_remove_page(d, _gfn(old_gpfn), _mfn(mfn),
PAGE_ORDER_4K);
+ rc = guest_physmap_remove_page(d, _gfn(old_gpfn), mfn, PAGE_ORDER_4K);
/* Map at new location. */
if ( !rc )
- rc = guest_physmap_add_page(d, gpfn, _mfn(mfn), PAGE_ORDER_4K);
+ rc = guest_physmap_add_page(d, gpfn, mfn, PAGE_ORDER_4K);
put_both:
/* In the XENMAPSPACE_gmfn, we took a ref of the gfn at the top */
diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index fb3859ce8e..9e18dc0493 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -3607,6 +3607,44 @@ int mem_sharing_gref_to_gfn(struct grant_table *gt,
grant_ref_t ref,
}
#endif
+int gnttab_map_frame(struct domain *d, unsigned long idx, gfn_t gfn,
+ mfn_t *mfn)
+{
+ int rc = 0;
+
+ grant_write_lock(d->grant_table);
+
+ if ( d->grant_table->gt_version == 0 )
+ d->grant_table->gt_version = 1;
+
+ if ( d->grant_table->gt_version == 2 &&
+ (idx & XENMAPIDX_grant_table_status) )
+ {
+ idx &= ~XENMAPIDX_grant_table_status;
+ if ( idx < nr_status_frames(d->grant_table) )
+ *mfn = _mfn(virt_to_mfn(d->grant_table->status[idx]));
+ else
+ rc = -EINVAL;
+ }
+ else
+ {
+ if ( (idx >= nr_grant_frames(d->grant_table)) &&
+ (idx < max_grant_frames) )
+ gnttab_grow_table(d, idx + 1);
+
+ if ( idx < nr_grant_frames(d->grant_table) )
+ *mfn = _mfn(virt_to_mfn(d->grant_table->shared_raw[idx]));
+ else
+ rc = -EINVAL;
+ }
+
+ gnttab_set_frame_gfn(d, idx, gfn);
+
+ grant_write_unlock(d->grant_table);
+
+ return rc;
+}
+
static void gnttab_usage_print(struct domain *rd)
{
int first = 1;
diff --git a/xen/include/asm-arm/grant_table.h
b/xen/include/asm-arm/grant_table.h
index bc4d61a940..581c4bf928 100644
--- a/xen/include/asm-arm/grant_table.h
+++ b/xen/include/asm-arm/grant_table.h
@@ -21,6 +21,12 @@ static inline int replace_grant_supported(void)
return 1;
}
+static inline void gnttab_set_frame_gfn(struct domain *d, unsigned long idx,
+ gfn_t gfn)
+{
+ d->arch.grant_table_gfn[idx] = gfn;
+}
+
#define gnttab_create_shared_page(d, t, i) \
do { \
share_xen_page_with_guest( \
diff --git a/xen/include/asm-x86/grant_table.h
b/xen/include/asm-x86/grant_table.h
index 33b2f88b96..c865999a33 100644
--- a/xen/include/asm-x86/grant_table.h
+++ b/xen/include/asm-x86/grant_table.h
@@ -75,6 +75,11 @@ static inline void gnttab_clear_flag(unsigned int nr,
uint16_t *st)
asm volatile ("lock btrw %w1,%0" : "=m" (*st) : "Ir" (nr), "m" (*st));
}
+static inline void gnttab_set_frame_gfn(struct domain *d, unsigned long idx,
+ gfn_t gfn)
+{
+}
+
/* Foreign mappings of HHVM-guest pages do not modify the type count. */
#define gnttab_host_mapping_get_page_type(ro, ld, rd) \
(!(ro) && (((ld) == (rd)) || !paging_mode_external(rd)))
diff --git a/xen/include/xen/grant_table.h b/xen/include/xen/grant_table.h
index af269a108d..43ec6c4d80 100644
--- a/xen/include/xen/grant_table.h
+++ b/xen/include/xen/grant_table.h
@@ -136,4 +136,7 @@ static inline unsigned int grant_to_status_frames(int
grant_frames)
int mem_sharing_gref_to_gfn(struct grant_table *gt, grant_ref_t ref,
gfn_t *gfn, uint16_t *status);
+int gnttab_map_frame(struct domain *d, unsigned long idx, gfn_t gfn,
+ mfn_t *mfn);
+
#endif /* __XEN_GRANT_TABLE_H__ */
--
2.12.3
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