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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v0 1/3] mem_access: modifications to mem_event enable API.
tools/libxc/:
1. Modified the API xc_mem_event_enable to initialize
shared ring to communicate with the hypervisor along with enabling mem_event.
2. Added memset to clear the ring_page of any bogus input before enabling any
events.
3. Replaced calls to deprecated function xc_map_foreign_batch with calls
to xc_map_foreign_bulk. The function xc_map_foreign_bulk has a cleaner
error reporting interface than xc_map_foreign_batch.
4. The API xc_mem_event_enable is now modified to return int rather than void *,
this was done to synchronize this API's behaviour with other mem_event API's.
tools/tests/xen-access/: Updated code to use the new helper API.
tools/ocaml/libs/xc/xenctrl_stubs.c: Changed the name of a macro from RING_SIZE
to BUF_RING_SIZE because the earlier name collided with xen shared ring
deinitions in io/ring.h
Signed-off-by: Dushyant Behl <myselfdushyantbehl@xxxxxxxxx>
---
tools/libxc/xc_mem_access.c | 8 ++++--
tools/libxc/xc_mem_event.c | 49 +++++++++++++++++++++++++++----------
tools/libxc/xc_private.h | 10 +++++---
tools/libxc/xenctrl.h | 9 ++++---
tools/ocaml/libs/xc/xenctrl_stubs.c | 6 ++---
tools/tests/xen-access/xen-access.c | 17 +++++--------
6 files changed, 64 insertions(+), 35 deletions(-)
diff --git a/tools/libxc/xc_mem_access.c b/tools/libxc/xc_mem_access.c
index 461f0e9..89050be 100644
--- a/tools/libxc/xc_mem_access.c
+++ b/tools/libxc/xc_mem_access.c
@@ -24,9 +24,13 @@
#include "xc_private.h"
#include <xen/memory.h>
-void *xc_mem_access_enable(xc_interface *xch, domid_t domain_id, uint32_t
*port)
+int xc_mem_access_enable(xc_interface *xch, domid_t domain_id,
+ uint32_t *port, void *ring_page,
+ mem_event_back_ring_t *back_ring)
{
- return xc_mem_event_enable(xch, domain_id, HVM_PARAM_ACCESS_RING_PFN,
port);
+ return xc_mem_event_enable(xch, domain_id,
+ HVM_PARAM_ACCESS_RING_PFN,
+ port, ring_page, back_ring);
}
int xc_mem_access_disable(xc_interface *xch, domid_t domain_id)
diff --git a/tools/libxc/xc_mem_event.c b/tools/libxc/xc_mem_event.c
index faf1cc6..3525a83 100644
--- a/tools/libxc/xc_mem_event.c
+++ b/tools/libxc/xc_mem_event.c
@@ -22,6 +22,7 @@
*/
#include "xc_private.h"
+#include <xen/mem_event.h>
int xc_mem_event_control(xc_interface *xch, domid_t domain_id, unsigned int op,
unsigned int mode, uint32_t *port)
@@ -56,19 +57,27 @@ int xc_mem_event_memop(xc_interface *xch, domid_t domain_id,
return do_memory_op(xch, mode, &meo, sizeof(meo));
}
-void *xc_mem_event_enable(xc_interface *xch, domid_t domain_id, int param,
- uint32_t *port)
+/*
+ * Enables mem_event and initializes shared ring to communicate with hypervisor
+ * returns 0 if success and if failure returns -errno with
+ * errno properly set to indicate possible error.
+ * param can be HVM_PARAM_PAGING/ACCESS/SHARING_RING_PFN
+ */
+int xc_mem_event_enable(xc_interface *xch, domid_t domain_id, int param,
+ uint32_t *port, void *ring_page,
+ mem_event_back_ring_t *back_ring)
{
- void *ring_page = NULL;
uint64_t pfn;
xen_pfn_t ring_pfn, mmap_pfn;
unsigned int op, mode;
- int rc1, rc2, saved_errno;
+ int rc1, rc2, saved_errno, err;
+
+ ring_page = NULL;
if ( !port )
{
errno = EINVAL;
- return NULL;
+ return -errno;
}
/* Pause the domain for ring page setup */
@@ -76,7 +85,7 @@ void *xc_mem_event_enable(xc_interface *xch, domid_t
domain_id, int param,
if ( rc1 != 0 )
{
PERROR("Unable to pause domain\n");
- return NULL;
+ return -errno;
}
/* Get the pfn of the ring page */
@@ -89,9 +98,9 @@ void *xc_mem_event_enable(xc_interface *xch, domid_t
domain_id, int param,
ring_pfn = pfn;
mmap_pfn = pfn;
- ring_page = xc_map_foreign_batch(xch, domain_id, PROT_READ | PROT_WRITE,
- &mmap_pfn, 1);
- if ( mmap_pfn & XEN_DOMCTL_PFINFO_XTAB )
+ ring_page = xc_map_foreign_bulk(xch, domain_id,
+ PROT_READ | PROT_WRITE, &mmap_pfn, &err,
1);
+ if ( (err != 0) || (ring_page == NULL) )
{
/* Map failed, populate ring page */
rc1 = xc_domain_populate_physmap_exact(xch, domain_id, 1, 0, 0,
@@ -103,15 +112,23 @@ void *xc_mem_event_enable(xc_interface *xch, domid_t
domain_id, int param,
}
mmap_pfn = ring_pfn;
- ring_page = xc_map_foreign_batch(xch, domain_id, PROT_READ |
PROT_WRITE,
- &mmap_pfn, 1);
- if ( mmap_pfn & XEN_DOMCTL_PFINFO_XTAB )
+ ring_page = xc_map_foreign_bulk(xch, domain_id, PROT_READ | PROT_WRITE,
+ &mmap_pfn, &err, 1);
+ if ( (err != 0) || (ring_page == NULL) )
{
PERROR("Could not map the ring page\n");
+ rc1 = -1;
goto out;
}
}
+ /* Clear the ring page */
+ memset(ring_page, 0, PAGE_SIZE);
+
+ /* Initialise ring */
+ SHARED_RING_INIT((mem_event_sring_t *)ring_page);
+ BACK_RING_INIT(back_ring, (mem_event_sring_t *)ring_page, PAGE_SIZE);
+
switch ( param )
{
case HVM_PARAM_PAGING_RING_PFN:
@@ -149,7 +166,12 @@ void *xc_mem_event_enable(xc_interface *xch, domid_t
domain_id, int param,
/* Remove the ring_pfn from the guest's physmap */
rc1 = xc_domain_decrease_reservation_exact(xch, domain_id, 1, 0,
&ring_pfn);
if ( rc1 != 0 )
+ {
PERROR("Failed to remove ring page from guest physmap");
+ goto out;
+ }
+
+ rc1 = 0;
out:
saved_errno = errno;
@@ -169,7 +191,8 @@ void *xc_mem_event_enable(xc_interface *xch, domid_t
domain_id, int param,
ring_page = NULL;
errno = saved_errno;
+ rc1 = -errno;
}
- return ring_page;
+ return rc1;
}
diff --git a/tools/libxc/xc_private.h b/tools/libxc/xc_private.h
index c50a7c9..cf9b223 100644
--- a/tools/libxc/xc_private.h
+++ b/tools/libxc/xc_private.h
@@ -32,6 +32,7 @@
#include "xenctrl.h"
#include "xenctrlosdep.h"
+#include <xen/mem_event.h>
#include <xen/sys/privcmd.h>
#if defined(HAVE_VALGRIND_MEMCHECK_H) && !defined(NDEBUG) &&
!defined(__MINIOS__)
@@ -377,10 +378,13 @@ int xc_mem_event_memop(xc_interface *xch, domid_t
domain_id,
unsigned int op, unsigned int mode,
uint64_t gfn, void *buffer);
/*
- * Enables mem_event and returns the mapped ring page indicated by param.
+ * Enables mem_event and initializes shared ring to communicate with hypervisor
+ * sets ring_page equal to mapped page.
+ * Returns 0 if success and if failure returns -errno with errno properly set.
* param can be HVM_PARAM_PAGING/ACCESS/SHARING_RING_PFN
*/
-void *xc_mem_event_enable(xc_interface *xch, domid_t domain_id, int param,
- uint32_t *port);
+int xc_mem_event_enable(xc_interface *xch, domid_t domain_id, int param,
+ uint32_t *port, void *ring_page,
+ mem_event_back_ring_t *back_ring);
#endif /* __XC_PRIVATE_H__ */
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 1c5d0db..d21f026 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -47,6 +47,7 @@
#include <xen/xsm/flask_op.h>
#include <xen/tmem.h>
#include <xen/kexec.h>
+#include <xen/mem_event.h>
#include "xentoollog.h"
@@ -2258,11 +2259,13 @@ int xc_mem_paging_load(xc_interface *xch, domid_t
domain_id,
*/
/*
- * Enables mem_access and returns the mapped ring page.
- * Will return NULL on error.
+ * Enables mem_access and sets arg ring page equal to mapped page.
+ * Will return 0 on success and -errno on error.
* Caller has to unmap this page when done.
*/
-void *xc_mem_access_enable(xc_interface *xch, domid_t domain_id, uint32_t
*port);
+int xc_mem_access_enable(xc_interface *xch, domid_t domain_id,
+ uint32_t *port, void *ring_page,
+ mem_event_back_ring_t *back_ring);
int xc_mem_access_disable(xc_interface *xch, domid_t domain_id);
int xc_mem_access_resume(xc_interface *xch, domid_t domain_id);
diff --git a/tools/ocaml/libs/xc/xenctrl_stubs.c
b/tools/ocaml/libs/xc/xenctrl_stubs.c
index f0810eb..beccb38 100644
--- a/tools/ocaml/libs/xc/xenctrl_stubs.c
+++ b/tools/ocaml/libs/xc/xenctrl_stubs.c
@@ -526,12 +526,12 @@ CAMLprim value stub_xc_evtchn_reset(value xch, value
domid)
}
-#define RING_SIZE 32768
-static char ring[RING_SIZE];
+#define BUF_RING_SIZE 32768
+static char ring[BUF_RING_SIZE];
CAMLprim value stub_xc_readconsolering(value xch)
{
- unsigned int size = RING_SIZE - 1;
+ unsigned int size = BUF_RING_SIZE - 1;
char *ring_ptr = ring;
int retval;
diff --git a/tools/tests/xen-access/xen-access.c
b/tools/tests/xen-access/xen-access.c
index 090df5f..9242f86 100644
--- a/tools/tests/xen-access/xen-access.c
+++ b/tools/tests/xen-access/xen-access.c
@@ -245,11 +245,12 @@ xenaccess_t *xenaccess_init(xc_interface **xch_r, domid_t
domain_id)
mem_event_ring_lock_init(&xenaccess->mem_event);
/* Enable mem_access */
- xenaccess->mem_event.ring_page =
- xc_mem_access_enable(xenaccess->xc_handle,
- xenaccess->mem_event.domain_id,
- &xenaccess->mem_event.evtchn_port);
- if ( xenaccess->mem_event.ring_page == NULL )
+ rc = xc_mem_access_enable(xenaccess->xc_handle,
+ xenaccess->mem_event.domain_id,
+ &xenaccess->mem_event.evtchn_port,
+ xenaccess->mem_event.ring_page,
+ &xenaccess->mem_event.back_ring);
+ if ( rc < 0 )
{
switch ( errno ) {
case EBUSY:
@@ -287,12 +288,6 @@ xenaccess_t *xenaccess_init(xc_interface **xch_r, domid_t
domain_id)
evtchn_bind = 1;
xenaccess->mem_event.port = rc;
- /* Initialise ring */
- SHARED_RING_INIT((mem_event_sring_t *)xenaccess->mem_event.ring_page);
- BACK_RING_INIT(&xenaccess->mem_event.back_ring,
- (mem_event_sring_t *)xenaccess->mem_event.ring_page,
- XC_PAGE_SIZE);
-
/* Get domaininfo */
xenaccess->domain_info = malloc(sizeof(xc_domaininfo_t));
if ( xenaccess->domain_info == NULL )
--
1.9.1
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