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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 03/13] xen/xsplice: Hypervisor implementation of XEN_XSPLICE_op (v7)
The implementation does not actually do any patching.
It just adds the framework for doing the hypercalls,
keeping track of ELF payloads, and the basic operations:
- query which payloads exist,
- query for specific payloads,
- check*1, apply*1, replace*1, and unload payloads.
*1: Which of course in this patch are nops.
Acked-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
---
v2: Rebased on keyhandler: rework keyhandler infrastructure
v3: Fixed XSM.
v4: Removed REVERTED state.
Split status and error code.
Add REPLACE action.
Separate payload data from the payload structure.
s/XSPLICE_ID_../XSPLICE_NAME_../
v5: Add xsplice and CONFIG_XSPLICE build toption.
Fix code per Jan's review.
Update the sysctl.h (change bits to enum like)
v6: Rebase on Kconfig changes.
v7: Add missing pad checks. Re-order keyhandler.h to build on ARM.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
tools/flask/policy/policy/modules/xen/xen.te | 1 +
xen/arch/arm/Kconfig | 1 +
xen/arch/x86/Kconfig | 1 +
xen/common/Kconfig | 14 +
xen/common/Makefile | 2 +
xen/common/sysctl.c | 8 +
xen/common/xsplice.c | 386 +++++++++++++++++++++++++++
xen/include/public/sysctl.h | 156 +++++++++++
xen/include/xen/xsplice.h | 7 +
xen/xsm/flask/hooks.c | 6 +
xen/xsm/flask/policy/access_vectors | 2 +
11 files changed, 584 insertions(+)
create mode 100644 xen/common/xsplice.c
create mode 100644 xen/include/xen/xsplice.h
diff --git a/tools/flask/policy/policy/modules/xen/xen.te
b/tools/flask/policy/policy/modules/xen/xen.te
index d35ae22..542c3e1 100644
--- a/tools/flask/policy/policy/modules/xen/xen.te
+++ b/tools/flask/policy/policy/modules/xen/xen.te
@@ -72,6 +72,7 @@ allow dom0_t xen_t:xen2 {
allow dom0_t xen_t:xen2 {
pmu_ctrl
get_symbol
+ xsplice_op
};
allow dom0_t xen_t:mmu memorymap;
diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index 60e923c..3780949 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -23,6 +23,7 @@ config ARM
select HAS_PASSTHROUGH
select HAS_PDX
select HAS_VIDEO
+ select HAS_XSPLICE
config ARCH_DEFCONFIG
string
diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig
index 4781b34..2b6c832 100644
--- a/xen/arch/x86/Kconfig
+++ b/xen/arch/x86/Kconfig
@@ -18,6 +18,7 @@ config X86
select HAS_PCI
select HAS_PDX
select HAS_VGA
+ select HAS_XSPLICE
config ARCH_DEFCONFIG
string
diff --git a/xen/common/Kconfig b/xen/common/Kconfig
index eadfc3b..aaf4053 100644
--- a/xen/common/Kconfig
+++ b/xen/common/Kconfig
@@ -51,6 +51,9 @@ config HAS_GDBSX
config HAS_IOPORTS
bool
+config HAS_XSPLICE
+ bool
+
# Enable/Disable kexec support
config KEXEC
bool "kexec support"
@@ -97,4 +100,15 @@ config XSM
If unsure, say N.
+# Enable/Disable xsplice support
+config XSPLICE
+ bool "xsplice support"
+ default y
+ depends on HAS_XSPLICE
+ ---help---
+ Allows a running Xen hypervisor to be patched without rebooting.
+ This is primarily used to patch an hypervisor with XSA fixes.
+
+ If unsure, say Y.
+
endmenu
diff --git a/xen/common/Makefile b/xen/common/Makefile
index 9f8b214..6fdeccf 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -71,3 +71,5 @@ subdir-$(coverage) += gcov
subdir-y += libelf
subdir-$(CONFIG_HAS_DEVICE_TREE) += libfdt
+
+obj-$(CONFIG_XSPLICE) += xsplice.o
diff --git a/xen/common/sysctl.c b/xen/common/sysctl.c
index a3007b8..55e6cfa 100644
--- a/xen/common/sysctl.c
+++ b/xen/common/sysctl.c
@@ -28,6 +28,7 @@
#include <xsm/xsm.h>
#include <xen/pmstat.h>
#include <xen/gcov.h>
+#include <xen/xsplice.h>
long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) u_sysctl)
{
@@ -460,6 +461,13 @@ long do_sysctl(XEN_GUEST_HANDLE_PARAM(xen_sysctl_t)
u_sysctl)
ret = tmem_control(&op->u.tmem_op);
break;
+#ifdef CONFIG_XSPLICE
+ case XEN_SYSCTL_xsplice_op:
+ ret = xsplice_control(&op->u.xsplice);
+ copyback = 1;
+ break;
+#endif
+
default:
ret = arch_do_sysctl(op, u_sysctl);
copyback = 0;
diff --git a/xen/common/xsplice.c b/xen/common/xsplice.c
new file mode 100644
index 0000000..3c6acc3
--- /dev/null
+++ b/xen/common/xsplice.c
@@ -0,0 +1,386 @@
+/*
+ * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
+ *
+ */
+
+#include <xen/guest_access.h>
+#include <xen/keyhandler.h>
+#include <xen/lib.h>
+#include <xen/list.h>
+#include <xen/mm.h>
+#include <xen/sched.h>
+#include <xen/smp.h>
+#include <xen/spinlock.h>
+#include <xen/xsplice.h>
+
+#include <asm/event.h>
+#include <public/sysctl.h>
+
+static DEFINE_SPINLOCK(payload_list_lock);
+static LIST_HEAD(payload_list);
+
+static unsigned int payload_cnt;
+static unsigned int payload_version = 1;
+
+struct payload {
+ int32_t state; /* One of the XSPLICE_STATE_*. */
+ int32_t rc; /* 0 or -XEN_EXX. */
+ struct list_head list; /* Linked to 'payload_list'. */
+ char name[XEN_XSPLICE_NAME_SIZE + 1];/* Name of it. */
+};
+
+static const char *state2str(int32_t state)
+{
+#define STATE(x) [XSPLICE_STATE_##x] = #x
+ static const char *const names[] = {
+ STATE(LOADED),
+ STATE(CHECKED),
+ STATE(APPLIED),
+ };
+#undef STATE
+
+ if (state >= ARRAY_SIZE(names))
+ return "unknown";
+
+ if (state < 0)
+ return "-EXX";
+
+ if (!names[state])
+ return "unknown";
+
+ return names[state];
+}
+
+static void xsplice_printall(unsigned char key)
+{
+ struct payload *data;
+
+ spin_lock(&payload_list_lock);
+
+ list_for_each_entry ( data, &payload_list, list )
+ printk(" name=%s state=%s(%d)\n", data->name,
+ state2str(data->state), data->state);
+
+ spin_unlock(&payload_list_lock);
+}
+
+static int verify_name(xen_xsplice_name_t *name)
+{
+ if ( name->size == 0 || name->size > XEN_XSPLICE_NAME_SIZE )
+ return -EINVAL;
+
+ if ( name->pad[0] || name->pad[1] || name->pad[2] )
+ return -EINVAL;
+
+ if ( !guest_handle_okay(name->name, name->size) )
+ return -EINVAL;
+
+ return 0;
+}
+
+static int find_payload(xen_xsplice_name_t *name, bool_t need_lock,
+ struct payload **f)
+{
+ struct payload *data;
+ XEN_GUEST_HANDLE_PARAM(char) str;
+ char n[XEN_XSPLICE_NAME_SIZE + 1] = { 0 };
+ int rc = -EINVAL;
+
+ rc = verify_name(name);
+ if ( rc )
+ return rc;
+
+ str = guest_handle_cast(name->name, char);
+ if ( copy_from_guest(n, str, name->size) )
+ return -EFAULT;
+
+ if ( need_lock )
+ spin_lock(&payload_list_lock);
+
+ rc = -ENOENT;
+ list_for_each_entry ( data, &payload_list, list )
+ {
+ if ( !strcmp(data->name, n) )
+ {
+ *f = data;
+ rc = 0;
+ break;
+ }
+ }
+
+ if ( need_lock )
+ spin_unlock(&payload_list_lock);
+
+ return rc;
+}
+
+static int verify_payload(xen_sysctl_xsplice_upload_t *upload)
+{
+ if ( verify_name(&upload->name) )
+ return -EINVAL;
+
+ if ( upload->size == 0 )
+ return -EINVAL;
+
+ if ( !guest_handle_okay(upload->payload, upload->size) )
+ return -EFAULT;
+
+ return 0;
+}
+
+/*
+ * We MUST be holding the payload_list_lock spinlock.
+ */
+static void free_payload(struct payload *data)
+{
+ list_del(&data->list);
+ payload_cnt--;
+ payload_version++;
+ xfree(data);
+}
+
+static int xsplice_upload(xen_sysctl_xsplice_upload_t *upload)
+{
+ struct payload *data = NULL;
+ uint8_t *raw_data;
+ int rc;
+
+ rc = verify_payload(upload);
+ if ( rc )
+ return rc;
+
+ rc = find_payload(&upload->name, 1 /* true. */, &data);
+ if ( rc == 0 /* Found. */ )
+ return -EEXIST;
+
+ if ( rc != -ENOENT )
+ return rc;
+
+ data = xzalloc(struct payload);
+ if ( !data )
+ return -ENOMEM;
+
+ memset(data, 0, sizeof *data);
+ rc = -EFAULT;
+ if ( copy_from_guest(data->name, upload->name.name, upload->name.size) )
+ goto err_data;
+
+ rc = -ENOMEM;
+ raw_data = alloc_xenheap_pages(get_order_from_bytes(upload->size), 0);
+ if ( !raw_data )
+ goto err_data;
+
+ rc = -EFAULT;
+ if ( copy_from_guest(raw_data, upload->payload, upload->size) )
+ goto err_raw;
+
+ data->state = XSPLICE_STATE_LOADED;
+ data->rc = 0;
+ INIT_LIST_HEAD(&data->list);
+
+ spin_lock(&payload_list_lock);
+ list_add_tail(&data->list, &payload_list);
+ payload_cnt++;
+ payload_version++;
+ spin_unlock(&payload_list_lock);
+
+ free_xenheap_pages(raw_data, get_order_from_bytes(upload->size));
+ return 0;
+
+ err_raw:
+ free_xenheap_pages(raw_data, get_order_from_bytes(upload->size));
+ err_data:
+ xfree(data);
+ return rc;
+}
+
+static int xsplice_get(xen_sysctl_xsplice_summary_t *summary)
+{
+ struct payload *data;
+ int rc;
+
+ if ( summary->status.state )
+ return -EINVAL;
+
+ if ( summary->status.rc != 0 )
+ return -EINVAL;
+
+ rc = verify_name(&summary->name);
+ if ( rc )
+ return rc;
+
+ rc = find_payload(&summary->name, 1 /* true. */, &data);
+ if ( rc )
+ return rc;
+
+ summary->status.state = data->state;
+ summary->status.rc = data->rc;
+
+ return 0;
+}
+
+static int xsplice_list(xen_sysctl_xsplice_list_t *list)
+{
+ xen_xsplice_status_t status;
+ struct payload *data;
+ unsigned int idx = 0, i = 0;
+ int rc = 0;
+
+ if ( list->nr > 1024 )
+ return -E2BIG;
+
+ if ( list->pad != 0 )
+ return -EINVAL;
+
+ if ( !guest_handle_okay(list->status, sizeof(status) * list->nr) ||
+ !guest_handle_okay(list->name, XEN_XSPLICE_NAME_SIZE * list->nr) ||
+ !guest_handle_okay(list->len, sizeof(uint32_t) * list->nr) )
+ return -EINVAL;
+
+ spin_lock(&payload_list_lock);
+ if ( list->idx > payload_cnt || !list->nr )
+ {
+ spin_unlock(&payload_list_lock);
+ return -EINVAL;
+ }
+
+ list_for_each_entry( data, &payload_list, list )
+ {
+ uint32_t len;
+
+ if ( list->idx > i++ )
+ continue;
+
+ status.state = data->state;
+ status.rc = data->rc;
+ len = strlen(data->name);
+
+ /* N.B. 'idx' != 'i'. */
+ if ( __copy_to_guest_offset(list->name, idx * XEN_XSPLICE_NAME_SIZE,
+ data->name, len) ||
+ __copy_to_guest_offset(list->len, idx, &len, 1) ||
+ __copy_to_guest_offset(list->status, idx, &status, 1) )
+ {
+ rc = -EFAULT;
+ break;
+ }
+ idx++;
+ if ( hypercall_preempt_check() || (idx + 1 > list->nr) )
+ break;
+ }
+ list->nr = payload_cnt - i; /* Remaining amount. */
+ list->version = payload_version;
+ spin_unlock(&payload_list_lock);
+
+ /* And how many we have processed. */
+ return rc ? : idx;
+}
+
+static int xsplice_action(xen_sysctl_xsplice_action_t *action)
+{
+ struct payload *data;
+ int rc;
+
+ rc = verify_name(&action->name);
+ if ( rc )
+ return rc;
+
+ spin_lock(&payload_list_lock);
+ rc = find_payload(&action->name, 0 /* We are holding the lock. */, &data);
+ if ( rc )
+ goto out;
+
+ switch ( action->cmd )
+ {
+ case XSPLICE_ACTION_CHECK:
+ if ( (data->state == XSPLICE_STATE_LOADED) ||
+ (data->state == XSPLICE_STATE_CHECKED) )
+ {
+ /* No implementation yet. */
+ data->state = XSPLICE_STATE_CHECKED;
+ data->rc = 0;
+ rc = 0;
+ }
+ break;
+ case XSPLICE_ACTION_UNLOAD:
+ if ( (data->state == XSPLICE_STATE_LOADED) ||
+ (data->state == XSPLICE_STATE_CHECKED) )
+ {
+ free_payload(data);
+ /* No touching 'data' from here on! */
+ rc = 0;
+ }
+ break;
+ case XSPLICE_ACTION_REVERT:
+ if ( data->state == XSPLICE_STATE_APPLIED )
+ {
+ /* No implementation yet. */
+ data->state = XSPLICE_STATE_CHECKED;
+ data->rc = 0;
+ rc = 0;
+ }
+ break;
+ case XSPLICE_ACTION_APPLY:
+ if ( (data->state == XSPLICE_STATE_CHECKED) )
+ {
+ /* No implementation yet. */
+ data->state = XSPLICE_STATE_APPLIED;
+ data->rc = 0;
+ rc = 0;
+ }
+ break;
+ case XSPLICE_ACTION_REPLACE:
+ if ( data->state == XSPLICE_STATE_CHECKED )
+ {
+ /* No implementation yet. */
+ data->state = XSPLICE_STATE_CHECKED;
+ data->rc = 0;
+ rc = 0;
+ }
+ break;
+ default:
+ rc = -EOPNOTSUPP;
+ break;
+ }
+
+ out:
+ spin_unlock(&payload_list_lock);
+
+ return rc;
+}
+
+int xsplice_control(xen_sysctl_xsplice_op_t *xsplice)
+{
+ int rc;
+
+ if ( xsplice->pad != 0 )
+ return -EINVAL;
+
+ switch ( xsplice->cmd )
+ {
+ case XEN_SYSCTL_XSPLICE_UPLOAD:
+ rc = xsplice_upload(&xsplice->u.upload);
+ break;
+ case XEN_SYSCTL_XSPLICE_GET:
+ rc = xsplice_get(&xsplice->u.get);
+ break;
+ case XEN_SYSCTL_XSPLICE_LIST:
+ rc = xsplice_list(&xsplice->u.list);
+ break;
+ case XEN_SYSCTL_XSPLICE_ACTION:
+ rc = xsplice_action(&xsplice->u.action);
+ break;
+ default:
+ rc = -EOPNOTSUPP;
+ break;
+ }
+
+ return rc;
+}
+
+static int __init xsplice_init(void)
+{
+ register_keyhandler('x', xsplice_printall, "print xsplicing info", 1);
+ return 0;
+}
+__initcall(xsplice_init);
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index 96680eb..0b0b879 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -766,6 +766,160 @@ struct xen_sysctl_tmem_op {
typedef struct xen_sysctl_tmem_op xen_sysctl_tmem_op_t;
DEFINE_XEN_GUEST_HANDLE(xen_sysctl_tmem_op_t);
+/*
+ * XEN_SYSCTL_XSPLICE_op
+ *
+ * Refer to the http://xenbits.xenproject.org/docs/unstable/misc/xsplice.html
+ * for the design details of this hyprcall.
+ */
+
+/*
+ * Structure describing an ELF payload. Uniquely identifies the
+ * payload. Should be human readable.
+ * Recommended length is upto XEN_XSPLICE_NAME_SIZE.
+ */
+#define XEN_XSPLICE_NAME_SIZE 128
+struct xen_xsplice_name {
+ XEN_GUEST_HANDLE_64(char) name; /* IN: pointer to name. */
+ uint16_t size; /* IN: size of name. May be upto
+ XEN_XSPLICE_NAME_SIZE. */
+ uint16_t pad[3]; /* IN: MUST be zero. */
+};
+typedef struct xen_xsplice_name xen_xsplice_name_t;
+DEFINE_XEN_GUEST_HANDLE(xen_xsplice_name_t);
+
+/*
+ * Upload a payload to the hypervisor. The payload is verified
+ * against basic checks and if there are any issues the proper return code
+ * will be returned. The payload is not applied at this time - that is
+ * controlled by XEN_SYSCTL_XSPLICE_ACTION.
+ *
+ * The return value is zero if the payload was succesfully uploaded.
+ * Otherwise an EXX return value is provided. Duplicate `name` are not
+ * supported.
+ *
+ * The payload at this point is verified against the basic checks.
+ *
+ * The `payload` is the ELF payload as mentioned in the `Payload format`
+ * section in the xSplice design document.
+ */
+#define XEN_SYSCTL_XSPLICE_UPLOAD 0
+struct xen_sysctl_xsplice_upload {
+ xen_xsplice_name_t name; /* IN, name of the patch. */
+ uint64_t size; /* IN, size of the ELF file. */
+ XEN_GUEST_HANDLE_64(uint8) payload; /* IN, the ELF file. */
+};
+typedef struct xen_sysctl_xsplice_upload xen_sysctl_xsplice_upload_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_xsplice_upload_t);
+
+/*
+ * Retrieve an status of an specific payload.
+ *
+ * Upon completion the `struct xen_xsplice_status` is updated.
+ *
+ * The return value is zero on success and XEN_EXX on failure. This operation
+ * is synchronous and does not require preemption.
+ */
+#define XEN_SYSCTL_XSPLICE_GET 1
+
+struct xen_xsplice_status {
+#define XSPLICE_STATE_LOADED 1
+#define XSPLICE_STATE_CHECKED 2
+#define XSPLICE_STATE_APPLIED 3
+ int32_t state; /* OUT: XSPLICE_STATE_*. IN: MUST be zero.
*/
+ int32_t rc; /* OUT: 0 if no error, otherwise -XEN_EXX.
*/
+ /* IN: MUST be zero. */
+};
+typedef struct xen_xsplice_status xen_xsplice_status_t;
+DEFINE_XEN_GUEST_HANDLE(xen_xsplice_status_t);
+
+struct xen_sysctl_xsplice_summary {
+ xen_xsplice_name_t name; /* IN, name of the payload. */
+ xen_xsplice_status_t status; /* IN/OUT, state of it. */
+};
+typedef struct xen_sysctl_xsplice_summary xen_sysctl_xsplice_summary_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_xsplice_summary_t);
+
+/*
+ * Retrieve an array of abbreviated status and names of payloads that are
+ * loaded in the hypervisor.
+ *
+ * If the hypercall returns an positive number, it is the number (up to `nr`)
+ * of the payloads returned, along with `nr` updated with the number of
remaining
+ * payloads, `version` updated (it may be the same across hypercalls. If it
+ * varies the data is stale and further calls could fail). The `status`,
+ * `name`, and `len`' are updated at their designed index value (`idx`) with
+ * the returned value of data.
+ *
+ * If the hypercall returns E2BIG the `nr` is too big and should be
+ * lowered.
+ *
+ * This operation can be preempted by the hypercall returning EAGAIN.
+ * Retry.
+ *
+ * Note that due to the asynchronous nature of hypercalls the domain might have
+ * added or removed the number of payloads making this information stale. It is
+ * the responsibility of the toolstack to use the `version` field to check
+ * between each invocation. if the version differs it should discard the stale
+ * data and start from scratch. It is OK for the toolstack to use the new
+ * `version` field.
+ */
+#define XEN_SYSCTL_XSPLICE_LIST 2
+struct xen_sysctl_xsplice_list {
+ uint32_t version; /* IN/OUT: Initially *MUST* be
zero.
+ On subsequent calls reuse value.
+ If varies between calls, we are
+ * getting stale data. */
+ uint32_t idx; /* IN/OUT: Index into array. */
+ uint32_t nr; /* IN: How many status, id, and len
+ should fill out.
+ OUT: How many payloads left. */
+ uint32_t pad; /* IN: Must be zero. */
+ XEN_GUEST_HANDLE_64(xen_xsplice_status_t) status; /* OUT. Must have enough
+ space allocate for nr of them.
*/
+ XEN_GUEST_HANDLE_64(char) name; /* OUT: Array of ids. Each member
+ MUST XEN_XSPLICE_NAME_SIZE in
size.
+ Must have nr of them. */
+ XEN_GUEST_HANDLE_64(uint32) len; /* OUT: Array of lengths of ids.
+ Must have nr of them. */
+};
+typedef struct xen_sysctl_xsplice_list xen_sysctl_xsplice_list_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_xsplice_list_t);
+
+/*
+ * Perform an operation on the payload structure referenced by the `name`
field.
+ * The operation request is asynchronous and the status should be retrieved
+ * by using either XEN_SYSCTL_XSPLICE_GET or XEN_SYSCTL_XSPLICE_LIST hypercall.
+ */
+#define XEN_SYSCTL_XSPLICE_ACTION 3
+struct xen_sysctl_xsplice_action {
+ xen_xsplice_name_t name; /* IN, name of the patch. */
+#define XSPLICE_ACTION_CHECK 1
+#define XSPLICE_ACTION_UNLOAD 2
+#define XSPLICE_ACTION_REVERT 3
+#define XSPLICE_ACTION_APPLY 4
+#define XSPLICE_ACTION_REPLACE 5
+ uint32_t cmd; /* IN: XSPLICE_ACTION_*. */
+ uint32_t timeout; /* IN: Zero if no timeout. */
+ /* Or upper bound of time (ms) */
+ /* for operation to take. */
+};
+typedef struct xen_sysctl_xsplice_action xen_sysctl_xsplice_action_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_xsplice_action_t);
+
+struct xen_sysctl_xsplice_op {
+ uint32_t cmd; /* IN: XEN_SYSCTL_XSPLICE_*. */
+ uint32_t pad; /* IN: Always zero. */
+ union {
+ xen_sysctl_xsplice_upload_t upload;
+ xen_sysctl_xsplice_list_t list;
+ xen_sysctl_xsplice_summary_t get;
+ xen_sysctl_xsplice_action_t action;
+ } u;
+};
+typedef struct xen_sysctl_xsplice_op xen_sysctl_xsplice_op_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_xsplice_op_t);
+
struct xen_sysctl {
uint32_t cmd;
#define XEN_SYSCTL_readconsole 1
@@ -791,6 +945,7 @@ struct xen_sysctl {
#define XEN_SYSCTL_pcitopoinfo 22
#define XEN_SYSCTL_psr_cat_op 23
#define XEN_SYSCTL_tmem_op 24
+#define XEN_SYSCTL_xsplice_op 25
uint32_t interface_version; /* XEN_SYSCTL_INTERFACE_VERSION */
union {
struct xen_sysctl_readconsole readconsole;
@@ -816,6 +971,7 @@ struct xen_sysctl {
struct xen_sysctl_psr_cmt_op psr_cmt_op;
struct xen_sysctl_psr_cat_op psr_cat_op;
struct xen_sysctl_tmem_op tmem_op;
+ struct xen_sysctl_xsplice_op xsplice;
uint8_t pad[128];
} u;
};
diff --git a/xen/include/xen/xsplice.h b/xen/include/xen/xsplice.h
new file mode 100644
index 0000000..2cb2035
--- /dev/null
+++ b/xen/include/xen/xsplice.h
@@ -0,0 +1,7 @@
+#ifndef __XEN_XSPLICE_H__
+#define __XEN_XSPLICE_H__
+
+struct xen_sysctl_xsplice_op;
+int xsplice_control(struct xen_sysctl_xsplice_op *);
+
+#endif /* __XEN_XSPLICE_H__ */
diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c
index 9b7de30..5346dcf 100644
--- a/xen/xsm/flask/hooks.c
+++ b/xen/xsm/flask/hooks.c
@@ -807,6 +807,12 @@ static int flask_sysctl(int cmd)
case XEN_SYSCTL_tmem_op:
return domain_has_xen(current->domain, XEN__TMEM_CONTROL);
+#ifdef CONFIG_XSPLICE
+ case XEN_SYSCTL_xsplice_op:
+ return avc_current_has_perm(SECINITSID_XEN, SECCLASS_XEN2,
+ XEN2__XSPLICE_OP, NULL);
+#endif
+
default:
printk("flask_sysctl: Unknown op %d\n", cmd);
return -EPERM;
diff --git a/xen/xsm/flask/policy/access_vectors
b/xen/xsm/flask/policy/access_vectors
index effb59f..5f08d05 100644
--- a/xen/xsm/flask/policy/access_vectors
+++ b/xen/xsm/flask/policy/access_vectors
@@ -93,6 +93,8 @@ class xen2
pmu_ctrl
# PMU use (domains, including unprivileged ones, will be using this operation)
pmu_use
+# XEN_SYSCTL_xsplice_op
+ xsplice_op
}
# Classes domain and domain2 consist of operations that a domain performs on
--
2.1.0
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