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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1/3] xen/tools: Remove the XENMEM_get_oustanding_pages and provide the data via xc_phys_info
During the review of the patches it was noticed that there exists
a race wherein the 'free_memory' value consists of information from
two hypercalls. That is the XEN_SYSCTL_physinfo and
XENMEM_get_outstanding_pages.
The free memory the host has available for guest is the difference between
the 'free_pages' (from XEN_SYSCTL_physinfo) and 'outstanding_pages'. As they
are two hypercalls many things can happen in between the execution of them.
This patch resolves this by eliminating the XENMEM_get_outstanding_pages
hypercall and providing the free_pages and outstanding_pages information
via the xc_phys_info structure.
It also removes the XSM hooks and adds locking as needed.
CC: dgdera@xxxxxxxxxxxxx
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
tools/libxc/xc_domain.c | 9 ---------
tools/libxc/xenctrl.h | 2 --
tools/libxl/libxl.c | 15 +--------------
tools/libxl/libxl.h | 1 -
tools/libxl/libxl_types.idl | 1 +
tools/libxl/xl_cmdimpl.c | 16 +++-------------
xen/common/memory.c | 8 --------
xen/common/page_alloc.c | 8 ++++++--
xen/common/sysctl.c | 3 ++-
xen/include/public/memory.h | 7 -------
xen/include/public/sysctl.h | 3 ++-
xen/include/xen/mm.h | 2 +-
xen/include/xsm/dummy.h | 6 ------
xen/include/xsm/xsm.h | 1 -
xen/xsm/dummy.c | 1 -
xen/xsm/flask/hooks.c | 6 ------
16 files changed, 16 insertions(+), 73 deletions(-)
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index bb71cca..3257e2a 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -873,15 +873,6 @@ int xc_domain_claim_pages(xc_interface *xch,
err = errno = 0;
return err;
}
-unsigned long xc_domain_get_outstanding_pages(xc_interface *xch)
-{
- long ret = do_memory_op(xch, XENMEM_get_outstanding_pages, NULL, 0);
-
- /* Ignore it if the hypervisor does not support the call. */
- if (ret == -1 && errno == ENOSYS)
- ret = errno = 0;
- return ret;
-}
int xc_domain_populate_physmap(xc_interface *xch,
uint32_t domid,
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index c024af4..40ee8fc 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -1182,8 +1182,6 @@ int xc_domain_claim_pages(xc_interface *xch,
uint32_t domid,
unsigned long nr_pages);
-unsigned long xc_domain_get_outstanding_pages(xc_interface *xch);
-
int xc_domain_memory_exchange_pages(xc_interface *xch,
int domid,
unsigned long nr_in_extents,
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index bc91fd5..ee1fa9c 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -3942,6 +3942,7 @@ int libxl_get_physinfo(libxl_ctx *ctx, libxl_physinfo
*physinfo)
physinfo->total_pages = xcphysinfo.total_pages;
physinfo->free_pages = xcphysinfo.free_pages;
physinfo->scrub_pages = xcphysinfo.scrub_pages;
+ physinfo->outstanding_pages = xcphysinfo.outstanding_pages;
l = xc_sharing_freed_pages(ctx->xch);
if (l == -ENOSYS) {
l = 0;
@@ -4105,20 +4106,6 @@ libxl_numainfo *libxl_get_numainfo(libxl_ctx *ctx, int
*nr)
return ret;
}
-uint64_t libxl_get_claiminfo(libxl_ctx *ctx)
-{
- long l;
-
- l = xc_domain_get_outstanding_pages(ctx->xch);
- if (l < 0) {
- LIBXL__LOG_ERRNOVAL(ctx, LIBXL__LOG_WARNING, l,
- "xc_domain_get_outstanding_pages failed.");
- return ERROR_FAIL;
- }
- /* In pages */
- return l;
-}
-
const libxl_version_info* libxl_get_version_info(libxl_ctx *ctx)
{
union {
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index ef96bce..0bc005e 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -624,7 +624,6 @@ int libxl_wait_for_free_memory(libxl_ctx *ctx, uint32_t
domid, uint32_t memory_k
/* wait for the memory target of a domain to be reached */
int libxl_wait_for_memory_target(libxl_ctx *ctx, uint32_t domid, int
wait_secs);
-uint64_t libxl_get_claiminfo(libxl_ctx *ctx);
int libxl_vncviewer_exec(libxl_ctx *ctx, uint32_t domid, int autopass);
int libxl_console_exec(libxl_ctx *ctx, uint32_t domid, int cons_num,
libxl_console_type type);
/* libxl_primary_console_exec finds the domid and console number
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index ecf1f0b..8262cba 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -487,6 +487,7 @@ libxl_physinfo = Struct("physinfo", [
("total_pages", uint64),
("free_pages", uint64),
("scrub_pages", uint64),
+ ("outstanding_pages", uint64),
("sharing_freed_pages", uint64),
("sharing_used_frames", uint64),
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index ef7f81b..5259b2e 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -4576,21 +4576,11 @@ static void output_physinfo(void)
unsigned int i;
libxl_bitmap cpumap;
int n = 0;
- long claims = 0;
if (libxl_get_physinfo(ctx, &info) != 0) {
fprintf(stderr, "libxl_physinfo failed.\n");
return;
}
- /*
- * Don't bother checking "claim_mode" as user might have turned it off
- * and we have outstanding claims.
- */
- if ((claims = libxl_get_claiminfo(ctx)) < 0){
- fprintf(stderr, "libxl_get_claiminfo failed. errno: %d (%s)\n",
- errno, strerror(errno));
- return;
- }
printf("nr_cpus : %d\n", info.nr_cpus);
printf("max_cpu_id : %d\n", info.max_cpu_id);
printf("nr_nodes : %d\n", info.nr_nodes);
@@ -4610,15 +4600,15 @@ static void output_physinfo(void)
if (vinfo) {
i = (1 << 20) / vinfo->pagesize;
printf("total_memory : %"PRIu64"\n", info.total_pages / i);
- printf("free_memory : %"PRIu64"\n", (info.free_pages -
claims) / i);
+ printf("free_memory : %"PRIu64"\n", (info.free_pages -
info.outstanding_pages) / i);
printf("sharing_freed_memory : %"PRIu64"\n",
info.sharing_freed_pages / i);
printf("sharing_used_memory : %"PRIu64"\n",
info.sharing_used_frames / i);
}
/*
* Only if enabled (claim_mode=1) or there are outstanding claims.
*/
- if (libxl_defbool_val(claim_mode) || claims)
- printf("outstanding_claims : %ld\n", claims / i);
+ if (libxl_defbool_val(claim_mode) || info.outstanding_pages)
+ printf("outstanding_claims : %ld\n", info.outstanding_pages / i);
if (!libxl_get_freecpus(ctx, &cpumap)) {
libxl_for_each_bit(i, cpumap)
diff --git a/xen/common/memory.c b/xen/common/memory.c
index 3239d53..06a0d0a 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -737,14 +737,6 @@ long do_memory_op(unsigned long cmd,
XEN_GUEST_HANDLE_PARAM(void) arg)
break;
- case XENMEM_get_outstanding_pages:
- rc = xsm_xenmem_get_outstanding_pages(XSM_PRIV);
-
- if ( !rc )
- rc = get_outstanding_claims();
-
- break;
-
default:
rc = arch_memory_op(op, arg);
break;
diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index 203f77a..ede896c 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -380,9 +380,13 @@ out:
return ret;
}
-long get_outstanding_claims(void)
+int get_outstanding_claims(uint64_t *free_pages, uint64_t *outstanding_pages)
{
- return outstanding_claims;
+ spin_lock(&heap_lock);
+ *outstanding_pages = outstanding_claims;
+ *free_pages = avail_domheap_pages();
+ spin_unlock(&heap_lock);
+ return 0;
}
static unsigned long init_node_heap(int node, unsigned long mfn,
diff --git a/xen/common/sysctl.c b/xen/common/sysctl.c
index 31f9650..117e095 100644
--- a/xen/common/sysctl.c
+++ b/xen/common/sysctl.c
@@ -264,7 +264,8 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t)
u_sysctl)
pi->max_node_id = MAX_NUMNODES-1;
pi->max_cpu_id = nr_cpu_ids - 1;
pi->total_pages = total_pages;
- pi->free_pages = avail_domheap_pages();
+ /* Protected by lock */
+ get_outstanding_claims(&pi->free_pages, &pi->outstanding_pages);
pi->scrub_pages = 0;
pi->cpu_khz = cpu_khz;
arch_do_physinfo(pi);
diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index 51d5254..7a26dee 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -459,13 +459,6 @@ DEFINE_XEN_GUEST_HANDLE(xen_mem_sharing_op_t);
* The zero value is appropiate.
*/
-/*
- * Get the number of pages currently claimed (but not yet "possessed")
- * across all domains. The caller must be privileged but otherwise
- * the call never fails.
- */
-#define XENMEM_get_outstanding_pages 25
-
#endif /* defined(__XEN__) || defined(__XEN_TOOLS__) */
#endif /* __XEN_PUBLIC_MEMORY_H__ */
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index 03710d8..8437d31 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -34,7 +34,7 @@
#include "xen.h"
#include "domctl.h"
-#define XEN_SYSCTL_INTERFACE_VERSION 0x00000009
+#define XEN_SYSCTL_INTERFACE_VERSION 0x0000000A
/*
* Read console content from Xen buffer ring.
@@ -101,6 +101,7 @@ struct xen_sysctl_physinfo {
uint64_aligned_t total_pages;
uint64_aligned_t free_pages;
uint64_aligned_t scrub_pages;
+ uint64_aligned_t outstanding_pages;
uint32_t hw_cap[8];
/* XEN_SYSCTL_PHYSCAP_??? */
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index efc45c7..e7c88a7 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -59,7 +59,7 @@ void destroy_xen_mappings(unsigned long v, unsigned long e);
/* Claim handling */
unsigned long domain_adjust_tot_pages(struct domain *d, long pages);
int domain_set_outstanding_pages(struct domain *d, unsigned long pages);
-long get_outstanding_claims(void);
+int get_outstanding_claims(uint64_t *free_pages, uint64_t *outstanding_pages);
/* Domain suballocator. These functions are *not* interrupt-safe.*/
void init_domheap_pages(paddr_t ps, paddr_t pe);
diff --git a/xen/include/xsm/dummy.h b/xen/include/xsm/dummy.h
index a872056..cc0a5a8 100644
--- a/xen/include/xsm/dummy.h
+++ b/xen/include/xsm/dummy.h
@@ -259,12 +259,6 @@ static XSM_INLINE int xsm_claim_pages(XSM_DEFAULT_ARG
struct domain *d)
return xsm_default_action(action, current->domain, d);
}
-static XSM_INLINE int xsm_xenmem_get_outstanding_pages(XSM_DEFAULT_VOID)
-{
- XSM_ASSERT_ACTION(XSM_PRIV);
- return xsm_default_action(action, current->domain, NULL);
-}
-
static XSM_INLINE int xsm_evtchn_unbound(XSM_DEFAULT_ARG struct domain *d,
struct evtchn *chn,
domid_t id2)
{
diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h
index 58a4fbb..65150a3 100644
--- a/xen/include/xsm/xsm.h
+++ b/xen/include/xsm/xsm.h
@@ -93,7 +93,6 @@ struct xsm_operations {
int (*add_to_physmap) (struct domain *d1, struct domain *d2);
int (*remove_from_physmap) (struct domain *d1, struct domain *d2);
int (*claim_pages) (struct domain *d);
- int (*xenmem_get_outstanding_pages) (void);
int (*console_io) (struct domain *d, int cmd);
diff --git a/xen/xsm/dummy.c b/xen/xsm/dummy.c
index 937761f..31e4f73 100644
--- a/xen/xsm/dummy.c
+++ b/xen/xsm/dummy.c
@@ -67,7 +67,6 @@ void xsm_fixup_ops (struct xsm_operations *ops)
set_to_dummy_if_null(ops, memory_stat_reservation);
set_to_dummy_if_null(ops, memory_pin_page);
set_to_dummy_if_null(ops, claim_pages);
- set_to_dummy_if_null(ops, xenmem_get_outstanding_pages);
set_to_dummy_if_null(ops, console_io);
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index bb10de3..8e93cdb 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -422,12 +422,6 @@ static int flask_claim_pages(struct domain *d)
return current_has_perm(d, SECCLASS_DOMAIN2, DOMAIN2__SETCLAIM);
}
-static int flask_xenmem_get_outstanding_pages(void)
-{
- return avc_current_has_perm(SECINITSID_XEN, SECCLASS_XEN,
- XEN__HEAP, NULL);
-}
-
static int flask_console_io(struct domain *d, int cmd)
{
u32 perm;
--
1.7.7.6
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