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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 3 of 5] mem_access: public interface changes
* Introduces a domain create flag to determine whether a memory event
access handler is required for the domain when permissions fail.
* Memory event request/response modification to accommodate useful fields
for access memory events
Signed-off-by: Joe Epstein <jepstein98@xxxxxxxxx>
diff -r 4e108cf56d07 xen/include/public/domctl.h
--- a/xen/include/public/domctl.h Mon Dec 27 08:00:09 2010 +0000
+++ b/xen/include/public/domctl.h Tue Dec 28 22:34:01 2010 -0800
@@ -47,17 +47,20 @@
uint32_t ssidref;
xen_domain_handle_t handle;
/* Is this an HVM guest (as opposed to a PV guest)? */
-#define _XEN_DOMCTL_CDF_hvm_guest 0
-#define XEN_DOMCTL_CDF_hvm_guest (1U<<_XEN_DOMCTL_CDF_hvm_guest)
+#define _XEN_DOMCTL_CDF_hvm_guest 0
+#define XEN_DOMCTL_CDF_hvm_guest (1U<<_XEN_DOMCTL_CDF_hvm_guest)
/* Use hardware-assisted paging if available? */
-#define _XEN_DOMCTL_CDF_hap 1
-#define XEN_DOMCTL_CDF_hap (1U<<_XEN_DOMCTL_CDF_hap)
+#define _XEN_DOMCTL_CDF_hap 1
+#define XEN_DOMCTL_CDF_hap (1U<<_XEN_DOMCTL_CDF_hap)
/* Should domain memory integrity be verifed by tboot during Sx? */
-#define _XEN_DOMCTL_CDF_s3_integrity 2
-#define XEN_DOMCTL_CDF_s3_integrity (1U<<_XEN_DOMCTL_CDF_s3_integrity)
+#define _XEN_DOMCTL_CDF_s3_integrity 2
+#define XEN_DOMCTL_CDF_s3_integrity (1U<<_XEN_DOMCTL_CDF_s3_integrity)
/* Disable out-of-sync shadow page tables? */
-#define _XEN_DOMCTL_CDF_oos_off 3
-#define XEN_DOMCTL_CDF_oos_off (1U<<_XEN_DOMCTL_CDF_oos_off)
+#define _XEN_DOMCTL_CDF_oos_off 3
+#define XEN_DOMCTL_CDF_oos_off (1U<<_XEN_DOMCTL_CDF_oos_off)
+ /* Require mem_event listener for access; else pause */
+#define _XEN_DOMCTL_CDF_access_required 4
+#define XEN_DOMCTL_CDF_access_required (1U<<_XEN_DOMCTL_CDF_access_required)
uint32_t flags;
};
typedef struct xen_domctl_createdomain xen_domctl_createdomain_t;
@@ -714,7 +717,7 @@
/*
* Page memory in and out.
*/
-#define XEN_DOMCTL_MEM_EVENT_OP_PAGING (1 << 0)
+#define XEN_DOMCTL_MEM_EVENT_OP_PAGING 1
/* Domain memory paging */
#define XEN_DOMCTL_MEM_EVENT_OP_PAGING_NOMINATE 0
@@ -722,6 +725,12 @@
#define XEN_DOMCTL_MEM_EVENT_OP_PAGING_PREP 2
#define XEN_DOMCTL_MEM_EVENT_OP_PAGING_RESUME 3
+/*
+ * Access permissions
+ */
+#define XEN_DOMCTL_MEM_EVENT_OP_ACCESS 2
+#define XEN_DOMCTL_MEM_EVENT_OP_ACCESS_RESUME 0
+
struct xen_domctl_mem_event_op {
uint32_t op; /* XEN_DOMCTL_MEM_EVENT_OP_* */
uint32_t mode; /* XEN_DOMCTL_MEM_EVENT_ENABLE_* */
diff -r 4e108cf56d07 xen/include/public/hvm/hvm_op.h
--- a/xen/include/public/hvm/hvm_op.h Mon Dec 27 08:00:09 2010 +0000
+++ b/xen/include/public/hvm/hvm_op.h Tue Dec 28 22:34:01 2010 -0800
@@ -158,4 +158,45 @@
typedef struct xen_hvm_xentrace xen_hvm_xentrace_t;
DEFINE_XEN_GUEST_HANDLE(xen_hvm_xentrace_t);
+#define HVMOP_set_mem_access 12
+typedef enum {
+ HVMMEM_access_n,
+ HVMMEM_access_r,
+ HVMMEM_access_w,
+ HVMMEM_access_rw,
+ HVMMEM_access_x,
+ HVMMEM_access_rx,
+ HVMMEM_access_wx,
+ HVMMEM_access_rwx,
+ HVMMEM_access_rx2rw, /* Page starts off as read-execute,
but automatically change
+ * to read-write on a write */
+ HVMMEM_access_default /* Take the domain default */
+} hvmmem_access_t;
+/* Notify that a region of memory is to have specific access types */
+struct xen_hvm_set_mem_access {
+ /* Domain to be updated. */
+ domid_t domid;
+ /* Memory type */
+ hvmmem_access_t hvmmem_access;
+ /* First pfn, or ~0ull to set the default access for new pages */
+ uint64_t first_pfn;
+ /* Number of pages, ignored on setting default access */
+ uint64_t nr;
+};
+typedef struct xen_hvm_set_mem_access xen_hvm_set_mem_access_t;
+DEFINE_XEN_GUEST_HANDLE(xen_hvm_set_mem_access_t);
+
+#define HVMOP_get_mem_access 13
+/* Notify that a region of memory is to have specific access types */
+struct xen_hvm_get_mem_access {
+ /* Domain to be queried. */
+ domid_t domid;
+ /* Memory type: OUT */
+ hvmmem_access_t hvmmem_access;
+ /* pfn, or ~0ull for default access for new pages. IN */
+ uint64_t pfn;
+};
+typedef struct xen_hvm_get_mem_access xen_hvm_get_mem_access_t;
+DEFINE_XEN_GUEST_HANDLE(xen_hvm_get_mem_access_t);
+
#endif /* __XEN_PUBLIC_HVM_HVM_OP_H__ */
diff -r 4e108cf56d07 xen/include/public/mem_event.h
--- a/xen/include/public/mem_event.h Mon Dec 27 08:00:09 2010 +0000
+++ b/xen/include/public/mem_event.h Tue Dec 28 22:34:01 2010 -0800
@@ -26,6 +26,11 @@
#include "xen.h"
#include "io/ring.h"
+/* Memory event type */
+#define MEM_EVENT_TYPE_SHARED 0
+#define MEM_EVENT_TYPE_PAGING 1
+#define MEM_EVENT_TYPE_ACCESS 2
+
/* Memory event flags */
#define MEM_EVENT_FLAG_VCPU_PAUSED (1 << 0)
@@ -34,10 +39,21 @@
} mem_event_shared_page_t;
typedef struct mem_event_st {
+ uint16_t type;
+ uint16_t flags;
+ uint32_t vcpu_id;
+
uint64_t gfn;
+ uint64_t offset;
+ uint64_t gla; /* if gla_valid */
+
uint32_t p2mt;
- uint32_t vcpu_id;
- uint64_t flags;
+
+ uint32_t access_r:1;
+ uint32_t access_w:1;
+ uint32_t access_x:1;
+ uint32_t gla_valid:1;
+ uint32_t available:28;
} mem_event_request_t, mem_event_response_t;
DEFINE_RING_TYPES(mem_event, mem_event_request_t, mem_event_response_t);
diff -r 4e108cf56d07 xen/common/domctl.c
--- a/xen/common/domctl.c Mon Dec 27 08:00:09 2010 +0000
+++ b/xen/common/domctl.c Tue Dec 28 22:35:53 2010 -0800
@@ -398,7 +398,7 @@
if ( supervisor_mode_kernel ||
(op->u.createdomain.flags &
~(XEN_DOMCTL_CDF_hvm_guest | XEN_DOMCTL_CDF_hap |
- XEN_DOMCTL_CDF_s3_integrity | XEN_DOMCTL_CDF_oos_off)) )
+ XEN_DOMCTL_CDF_s3_integrity | XEN_DOMCTL_CDF_oos_off |
XEN_DOMCTL_CDF_access_required)) )
break;
dom = op->domain;
@@ -434,6 +434,8 @@
domcr_flags |= DOMCRF_s3_integrity;
if ( op->u.createdomain.flags & XEN_DOMCTL_CDF_oos_off )
domcr_flags |= DOMCRF_oos_off;
+ if ( op->u.createdomain.flags & XEN_DOMCTL_CDF_access_required )
+ domcr_flags |= DOMCRF_access_required;
ret = -ENOMEM;
d = domain_create(dom, domcr_flags, op->u.createdomain.ssidref);
diff -r 4e108cf56d07 xen/include/xen/sched.h
--- a/xen/include/xen/sched.h Mon Dec 27 08:00:09 2010 +0000
+++ b/xen/include/xen/sched.h Tue Dec 28 22:38:35 2010 -0800
@@ -403,22 +403,24 @@
struct domain *domain_create(
domid_t domid, unsigned int domcr_flags, ssidref_t ssidref);
/* DOMCRF_hvm: Create an HVM domain, as opposed to a PV domain. */
-#define _DOMCRF_hvm 0
-#define DOMCRF_hvm (1U<<_DOMCRF_hvm)
+#define _DOMCRF_hvm 0
+#define DOMCRF_hvm (1U<<_DOMCRF_hvm)
/* DOMCRF_hap: Create a domain with hardware-assisted paging. */
-#define _DOMCRF_hap 1
-#define DOMCRF_hap (1U<<_DOMCRF_hap)
+#define _DOMCRF_hap 1
+#define DOMCRF_hap (1U<<_DOMCRF_hap)
/* DOMCRF_s3_integrity: Create a domain with tboot memory integrity protection
by tboot */
-#define _DOMCRF_s3_integrity 2
-#define DOMCRF_s3_integrity (1U<<_DOMCRF_s3_integrity)
+#define _DOMCRF_s3_integrity 2
+#define DOMCRF_s3_integrity (1U<<_DOMCRF_s3_integrity)
/* DOMCRF_dummy: Create a dummy domain (not scheduled; not on domain list) */
-#define _DOMCRF_dummy 3
-#define DOMCRF_dummy (1U<<_DOMCRF_dummy)
+#define _DOMCRF_dummy 3
+#define DOMCRF_dummy (1U<<_DOMCRF_dummy)
/* DOMCRF_oos_off: dont use out-of-sync optimization for shadow page tables */
-#define _DOMCRF_oos_off 4
-#define DOMCRF_oos_off (1U<<_DOMCRF_oos_off)
-
+#define _DOMCRF_oos_off 4
+#define DOMCRF_oos_off (1U<<_DOMCRF_oos_off)
+/* DOMCRF_access_required: mem_event listener required for access;
else pause */
+#define _DOMCRF_access_required 5
+#define DOMCRF_access_required (1U<<_DOMCRF_access_required)
/*
* rcu_lock_domain_by_id() is more efficient than get_domain_by_id().
* This is the preferred function if the returned domain reference
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