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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v9 1/8] xen: introduce gnttab_max_frames and gnttab_max_maptrack_frames command line options
Introduce gnttab_max_maptrack_frames: a new Xen command line option to
specify the max number of maptrack frames per domain.
Deprecate the old gnttab_max_nr_frames and introduce gnttab_max_frames
instead, that doesn't affect the maptrack. Keep gnttab_max_nr_frames for
compatibility.
Rename internally max_nr_grant_frames to max_grant_frames to avoid
confusions.
Introduce DEFAULT_MAX_MAPTRACK_FRAMES, that is completely independent
from max_nr_grant_frames.
Remove MAX_MAPTRACK_TO_GRANTS_RATIO that is now only used in one place
for compatibility.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Changes in v9:
- fix coding style for comments;
- other style fixes.
Changes in v8:
- remove unused #include;
- set max_nr_grant_frames as __initdata;
- set max_grant_frames and max_maptrack_frames as __read_mostly;
- fix coding style for comments;
- remove MAX_MAPTRACK_TO_GRANTS_RATIO.
Changes in v7:
- remove 0 initializers;
- make max_nr_grant_frames static;
- remove preprocessors check on max_nr_grant_frames;
- remove double black line;
- introduce DEFAULT_MAX_MAPTRACK_FRAMES;
- no long lines;
- set the new variables independently if the old one is passed as
argument.
Changes in v6:
- change ordering of options in xen-command-line.markdown;
- initialize all options to 0, then set the defaults on an initcall
depending on what options are used.
Changes in v5:
- /max_nr_maptrack_frames/max_maptrack_frames/g;
- deprecate gnttab_max_nr_frames;
- introduce gnttab_max_frames;
- rename the max_nr_grant_frames variable to max_grant_frames.
---
docs/misc/xen-command-line.markdown | 17 +++++++++-
xen/arch/arm/domain.c | 2 +-
xen/arch/arm/mm.c | 2 +-
xen/arch/x86/mm.c | 2 +-
xen/common/compat/grant_table.c | 12 +++----
xen/common/grant_table.c | 63 ++++++++++++++++++++++++-----------
xen/include/asm-arm/grant_table.h | 2 +-
xen/include/xen/grant_table.h | 4 +--
8 files changed, 71 insertions(+), 33 deletions(-)
diff --git a/docs/misc/xen-command-line.markdown
b/docs/misc/xen-command-line.markdown
index 28bbaaf..00416af 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -608,11 +608,26 @@ does not provide VM\_ENTRY\_LOAD\_GUEST\_PAT.
Specify the serial parameters for the GDB stub.
-### gnttab\_max\_nr\_frames
+### gnttab\_max\_frames
> `= <integer>`
Specify the maximum number of frames per grant table operation.
+### gnttab\_max\_maptrack\_frames
+> `= <integer>`
+
+Specify the maximum number of maptrack frames domain.
+The default value is 8 times gnttab_max_frames.
+
+### gnttab\_max\_nr\_frames
+> `= <integer>`
+
+*Deprecated*
+Use gnttab\_max\_frames and gnttab\_max\_maptrack\_frames instead.
+
+Specify the maximum number of frames per grant table operation and the
+maximum number of maptrack frames domain.
+
### guest\_loglvl
> `= <level>[/<rate-limited level>]` where level is `none | error | warning |
> info | debug | all`
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 2b53931..57f09c3 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -409,7 +409,7 @@ struct domain *alloc_domain_struct(void)
return NULL;
clear_page(d);
- d->arch.grant_table_gpfn = xzalloc_array(xen_pfn_t, max_nr_grant_frames);
+ d->arch.grant_table_gpfn = xzalloc_array(xen_pfn_t, max_grant_frames);
return d;
}
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 97e5bc39..dd70d81 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1054,7 +1054,7 @@ int xenmem_add_to_physmap_one(
else
{
if ( (idx >= nr_grant_frames(d->grant_table)) &&
- (idx < max_nr_grant_frames) )
+ (idx < max_grant_frames) )
gnttab_grow_table(d, idx + 1);
if ( idx < nr_grant_frames(d->grant_table) )
diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index 6cd7f45..edd1923 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -4564,7 +4564,7 @@ int xenmem_add_to_physmap_one(
else
{
if ( (idx >= nr_grant_frames(d->grant_table)) &&
- (idx < max_nr_grant_frames) )
+ (idx < max_grant_frames) )
gnttab_grow_table(d, idx + 1);
if ( idx < nr_grant_frames(d->grant_table) )
diff --git a/xen/common/compat/grant_table.c b/xen/common/compat/grant_table.c
index 7ebbbc1..2dc1e44 100644
--- a/xen/common/compat/grant_table.c
+++ b/xen/common/compat/grant_table.c
@@ -146,11 +146,11 @@ int compat_grant_table_op(unsigned int cmd,
unsigned int max_frame_list_size_in_page =
(COMPAT_ARG_XLAT_SIZE - sizeof(*nat.setup)) /
sizeof(*nat.setup->frame_list.p);
- if ( max_frame_list_size_in_page < max_nr_grant_frames )
+ if ( max_frame_list_size_in_page < max_grant_frames )
{
gdprintk(XENLOG_WARNING,
- "max_nr_grant_frames is too large (%u,%u)\n",
- max_nr_grant_frames, max_frame_list_size_in_page);
+ "max_grant_frames is too large (%u,%u)\n",
+ max_grant_frames, max_frame_list_size_in_page);
rc = -EINVAL;
}
else
@@ -284,11 +284,11 @@ int compat_grant_table_op(unsigned int cmd,
break;
}
if ( max_frame_list_size_in_pages <
- grant_to_status_frames(max_nr_grant_frames) )
+ grant_to_status_frames(max_grant_frames) )
{
gdprintk(XENLOG_WARNING,
- "grant_to_status_frames(max_nr_grant_frames) is too
large (%u,%u)\n",
- grant_to_status_frames(max_nr_grant_frames),
+ "grant_to_status_frames(max_grant_frames) is too
large (%u,%u)\n",
+ grant_to_status_frames(max_grant_frames),
max_frame_list_size_in_pages);
rc = -EINVAL;
break;
diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index 23266c3..ce4e093 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -40,16 +40,27 @@
#include <xsm/xsm.h>
#include <asm/flushtlb.h>
-#ifndef max_nr_grant_frames
-unsigned int max_nr_grant_frames = DEFAULT_MAX_NR_GRANT_FRAMES;
+/*
+ * this option is deprecated, use gnttab_max_frames and
+ * gnttab_max_maptrack_frames instead
+ */
+static unsigned int __initdata max_nr_grant_frames;
integer_param("gnttab_max_nr_frames", max_nr_grant_frames);
-#endif
+
+unsigned int __read_mostly max_grant_frames;
+integer_param("gnttab_max_frames", max_grant_frames);
/* The maximum number of grant mappings is defined as a multiplier of the
* maximum number of grant table entries. This defines the multiplier used.
* Pretty arbitrary. [POLICY]
+ * As gnttab_max_nr_frames has been deprecated, this multiplier is deprecated
too.
+ * New options allow to set max_maptrack_frames and
+ * map_grant_table_frames independently.
*/
-#define MAX_MAPTRACK_TO_GRANTS_RATIO 8
+#define DEFAULT_MAX_MAPTRACK_FRAMES 256
+
+static unsigned int __read_mostly max_maptrack_frames;
+integer_param("gnttab_max_maptrack_frames", max_maptrack_frames);
/*
* The first two members of a grant entry are updated as a combined pair.
@@ -102,11 +113,6 @@ nr_maptrack_frames(struct grant_table *t)
return t->maptrack_limit / MAPTRACK_PER_PAGE;
}
-static unsigned inline int max_nr_maptrack_frames(void)
-{
- return (max_nr_grant_frames * MAX_MAPTRACK_TO_GRANTS_RATIO);
-}
-
#define MAPTRACK_TAIL (~0u)
#define SHGNT_PER_PAGE_V1 (PAGE_SIZE / sizeof(grant_entry_v1_t))
@@ -164,7 +170,7 @@ num_act_frames_from_sha_frames(const unsigned int num)
}
#define max_nr_active_grant_frames \
- num_act_frames_from_sha_frames(max_nr_grant_frames)
+ num_act_frames_from_sha_frames(max_grant_frames)
static inline unsigned int
nr_active_grant_frames(struct grant_table *gt)
@@ -271,7 +277,7 @@ get_maptrack_handle(
while ( unlikely((handle = __get_maptrack_handle(lgt)) == -1) )
{
nr_frames = nr_maptrack_frames(lgt);
- if ( nr_frames >= max_nr_maptrack_frames() )
+ if ( nr_frames >= max_maptrack_frames )
break;
new_mt = alloc_xenheap_page();
@@ -1265,7 +1271,7 @@ gnttab_grow_table(struct domain *d, unsigned int
req_nr_frames)
struct grant_table *gt = d->grant_table;
unsigned int i;
- ASSERT(req_nr_frames <= max_nr_grant_frames);
+ ASSERT(req_nr_frames <= max_grant_frames);
gdprintk(XENLOG_INFO,
"Expanding dom (%d) grant table from (%d) to (%d) frames.\n",
@@ -1338,11 +1344,11 @@ gnttab_setup_table(
return -EFAULT;
}
- if ( unlikely(op.nr_frames > max_nr_grant_frames) )
+ if ( unlikely(op.nr_frames > max_grant_frames) )
{
gdprintk(XENLOG_INFO, "Xen only supports up to %d grant-table frames"
" per domain.\n",
- max_nr_grant_frames);
+ max_grant_frames);
op.status = GNTST_general_error;
goto out1;
}
@@ -1377,7 +1383,7 @@ gnttab_setup_table(
{
gdprintk(XENLOG_INFO,
"Expand grant table to %u failed. Current: %u Max: %u\n",
- op.nr_frames, nr_grant_frames(gt), max_nr_grant_frames);
+ op.nr_frames, nr_grant_frames(gt), max_grant_frames);
op.status = GNTST_general_error;
goto out3;
}
@@ -1438,7 +1444,7 @@ gnttab_query_size(
spin_lock(&d->grant_table->lock);
op.nr_frames = nr_grant_frames(d->grant_table);
- op.max_nr_frames = max_nr_grant_frames;
+ op.max_nr_frames = max_grant_frames;
op.status = GNTST_okay;
spin_unlock(&d->grant_table->lock);
@@ -2659,7 +2665,7 @@ grant_table_create(
/* Tracking of mapped foreign frames table */
if ( (t->maptrack = xzalloc_array(struct grant_mapping *,
- max_nr_maptrack_frames())) == NULL )
+ max_maptrack_frames)) == NULL )
goto no_mem_2;
if ( (t->maptrack[0] = alloc_xenheap_page()) == NULL )
goto no_mem_3;
@@ -2670,7 +2676,7 @@ grant_table_create(
t->maptrack[0][i - 1].ref = MAPTRACK_TAIL;
/* Shared grant table. */
- if ( (t->shared_raw = xzalloc_array(void *, max_nr_grant_frames)) == NULL )
+ if ( (t->shared_raw = xzalloc_array(void *, max_grant_frames)) == NULL )
goto no_mem_3;
for ( i = 0; i < INITIAL_NR_GRANT_FRAMES; i++ )
{
@@ -2681,7 +2687,7 @@ grant_table_create(
/* Status pages for grant table - for version 2 */
t->status = xzalloc_array(grant_status_t *,
- grant_to_status_frames(max_nr_grant_frames));
+ grant_to_status_frames(max_grant_frames));
if ( t->status == NULL )
goto no_mem_4;
@@ -2930,6 +2936,25 @@ static struct keyhandler
gnttab_usage_print_all_keyhandler = {
static int __init gnttab_usage_init(void)
{
+ BUILD_BUG_ON(DEFAULT_MAX_MAPTRACK_FRAMES < DEFAULT_MAX_NR_GRANT_FRAMES);
+
+ if ( max_nr_grant_frames )
+ {
+ printk(XENLOG_WARNING
+ "gnttab_max_nr_frames is deprecated, use gnttab_max_frames
instead\n");
+ if ( !max_grant_frames )
+ max_grant_frames = max_nr_grant_frames;
+ if ( !max_maptrack_frames )
+ max_maptrack_frames = max_nr_grant_frames *
+ (DEFAULT_MAX_MAPTRACK_FRAMES / DEFAULT_MAX_NR_GRANT_FRAMES);
+ }
+
+ if ( !max_grant_frames )
+ max_grant_frames = DEFAULT_MAX_NR_GRANT_FRAMES;
+
+ if ( !max_maptrack_frames )
+ max_maptrack_frames = DEFAULT_MAX_MAPTRACK_FRAMES;
+
register_keyhandler('g', &gnttab_usage_print_all_keyhandler);
return 0;
}
diff --git a/xen/include/asm-arm/grant_table.h
b/xen/include/asm-arm/grant_table.h
index 47147ce..e798880 100644
--- a/xen/include/asm-arm/grant_table.h
+++ b/xen/include/asm-arm/grant_table.h
@@ -31,7 +31,7 @@ static inline int replace_grant_supported(void)
#define gnttab_shared_gmfn(d, t, i) \
( ((i >= nr_grant_frames(d->grant_table)) && \
- (i < max_nr_grant_frames)) ? 0 : (d->arch.grant_table_gpfn[i]))
+ (i < max_grant_frames)) ? 0 : (d->arch.grant_table_gpfn[i]))
#define gnttab_need_iommu_mapping(d) (is_domain_direct_mapped(d))
diff --git a/xen/include/xen/grant_table.h b/xen/include/xen/grant_table.h
index 5941191..32f5786 100644
--- a/xen/include/xen/grant_table.h
+++ b/xen/include/xen/grant_table.h
@@ -49,10 +49,8 @@
/* Default maximum size of a grant table. [POLICY] */
#define DEFAULT_MAX_NR_GRANT_FRAMES 32
#endif
-#ifndef max_nr_grant_frames /* to allow arch to override */
/* The maximum size of a grant table. */
-extern unsigned int max_nr_grant_frames;
-#endif
+extern unsigned int max_grant_frames;
/*
* Tracks a mapping of another domain's grant reference. Each domain has a
--
1.7.10.4
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