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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH/RFC] memory_map + set_memmap_limit hypercall/domctl
Here's a new shot of the memory map related hypercall/domctl As previously requested by Keir, I'm adding a new hypercall, (set_memmap_limit), whose purpose is to inform hypervisor about the maximum value the physical limit of a domain can grow to. I consider it close to a final version, but I'd still like to receive comments on some specific points (besides any other that you see fit, for sure ;-) ) * I'm assuming that a (int) representation of max_pages being negative will always means it's unlimited for this guest, and we don't want to rely on this for stabilishing our phys map. Keir, can it be granted? * I'm assuming that the domctl to set the physicall mapping cannot be called more than once, and returning an EINVAL in such a case. Is it reasonable? Thanks! -- Glauber de Oliveira Costa Red Hat Inc. "Free as in Freedom" --- ./xen/arch/x86/mm.c.orig 2006-11-24 09:15:25.000000000 -0500
+++ ./xen/arch/x86/mm.c 2006-11-27 14:52:55.000000000 -0500
@@ -2974,7 +2974,45 @@ long arch_memory_op(int op, XEN_GUEST_HA
case XENMEM_memory_map:
{
- return -ENOSYS;
+ struct xen_memory_map memmap;
+ struct domain *d;
+ XEN_GUEST_HANDLE(e820entry_t) buffer;
+ struct e820entry map;
+
+
+ d = current->domain;
+
+ if ( copy_from_guest(&memmap, arg, 1) )
+ return -EFAULT;
+
+ buffer = guest_handle_cast(memmap.buffer, e820entry_t);
+ if ( unlikely(guest_handle_is_null(buffer)) )
+ return -EFAULT;
+
+ memmap.nr_entries = 1;
+
+ /* if we were not supplied with proper information, we try to use
+ * current max_pages information as an upper bound. If it's zero or
+ * unlimited, tot_pages is all that is left for us */ /
+ if ( d->memmap_limit )
+ map.size = d->memmap_limit;
+ else if ( (int)d->max_pages > 0 )
+ map.size = d->max_pages << PAGE_SHIFT;
+ else
+ map.size = d->tot_pages << PAGE_SHIFT;
+
+ /* 8MB slack (to balance backend allocations). */
+ map.size += 8 << 20;
+ map.addr = 0ULL;
+ map.type = E820_RAM;
+
+ if ( copy_to_guest(arg, &memmap, 1) )
+ return -EFAULT;
+
+ if ( copy_to_guest(buffer, &map, 1) < 0 )
+ return -EFAULT;
+
+ return 0;
}
case XENMEM_machine_memory_map:
--- ./xen/include/xen/sched.h.orig 2006-11-24 09:15:33.000000000 -0500
+++ ./xen/include/xen/sched.h 2006-11-27 13:59:33.000000000 -0500
@@ -112,6 +112,7 @@ struct domain
struct list_head xenpage_list; /* linked list, of size xenheap_pages */
unsigned int tot_pages; /* number of pages currently possesed */
unsigned int max_pages; /* maximum value for tot_pages */
+ unsigned int memmap_limit; /* the higher our memory map can go */
unsigned int xenheap_pages; /* # pages allocated from Xen heap */
/* Scheduling. */
--- ./xen/include/public/domctl.h.orig 2006-11-24 09:16:17.000000000 -0500
+++ ./xen/include/public/domctl.h 2006-11-27 13:55:18.000000000 -0500
@@ -348,6 +348,14 @@ struct xen_domctl_settimeoffset {
typedef struct xen_domctl_settimeoffset xen_domctl_settimeoffset_t;
DEFINE_XEN_GUEST_HANDLE(xen_domctl_settimeoffset_t);
+#define XEN_DOMCTL_memmap_limit 26
+struct xen_domctl_memmap_limit {
+ /* IN variables. */
+ uint64_t map_limitkb;
+};
+typedef struct xen_domctl_memory_map_limit xen_domctl_map_limit_t;
+DEFINE_XEN_GUEST_HANDLE(xen_domctl_map_limit_t);
+
struct xen_domctl {
uint32_t cmd;
uint32_t interface_version; /* XEN_DOMCTL_INTERFACE_VERSION */
@@ -373,9 +381,11 @@ struct xen_domctl {
struct xen_domctl_hypercall_init hypercall_init;
struct xen_domctl_arch_setup arch_setup;
struct xen_domctl_settimeoffset settimeoffset;
- uint8_t pad[128];
+ struct xen_domctl_memmap_limit memmap_limit;
+ uint8_t pad[120];
} u;
};
+
typedef struct xen_domctl xen_domctl_t;
DEFINE_XEN_GUEST_HANDLE(xen_domctl_t);
--- ./xen/common/domctl.c.orig 2006-11-24 09:16:03.000000000 -0500
+++ ./xen/common/domctl.c 2006-11-27 13:54:27.000000000 -0500
@@ -546,6 +546,29 @@ long do_domctl(XEN_GUEST_HANDLE(xen_domc
}
break;
+ case XEN_DOMCTL_memmap_limit:
+ {
+ struct domain *d;
+ unsigned long new_limit;
+
+ ret = -ESRCH;
+ d = find_domain_by_id(op->domain);
+ if ( d == NULL )
+ break;
+
+ ret = -EINVAL;
+ new_limit = op->u.memmap_limit.map_limitkb << 10;
+
+ /* No point in neither calling it more than once, nor
+ * setting physical map limit to zero */
+ if ( (d->memmap_limit == 0) && (new_limit != 0) )
+ {
+ d->memmap_limit = new_limit;
+ ret = 0;
+ }
+
+ put_domain(d);
+ }
case XEN_DOMCTL_setdomainhandle:
{
struct domain *d;
--- ./tools/libxc/xenctrl.h.orig 2006-11-24 09:23:07.000000000 -0500
+++ ./tools/libxc/xenctrl.h 2006-11-27 13:53:09.000000000 -0500
@@ -407,6 +407,10 @@ int xc_domain_setmaxmem(int xc_handle,
uint32_t domid,
unsigned int max_memkb);
+int xc_domain_set_memmap_limit(int xc_handle,
+ uint32_t domid,
+ unsigned int map_limitkb);
+
int xc_domain_set_time_offset(int xc_handle,
uint32_t domid,
int32_t time_offset_seconds);
--- ./tools/libxc/xc_domain.c.orig 2006-11-24 09:18:08.000000000 -0500
+++ ./tools/libxc/xc_domain.c 2006-11-27 13:57:25.000000000 -0500
@@ -313,6 +313,17 @@ int xc_domain_setmaxmem(int xc_handle,
return do_domctl(xc_handle, &domctl);
}
+int xc_domain_set_memmap_limit(int xc_handle,
+ uint32_t domid,
+ unsigned int map_limitkb)
+{
+ DECLARE_DOMCTL;
+ domctl.cmd = XEN_DOMCTL_memmap_limit;
+ domctl.domain = (domid_t)domid;
+ domctl.u.memmap_limit.map_limitkb = map_limitkb;
+ return do_domctl(xc_handle, &domctl);
+}
+
int xc_domain_set_time_offset(int xc_handle,
uint32_t domid,
int32_t time_offset_seconds)
--- ./tools/python/xen/lowlevel/xc/xc.c.orig 2006-11-27 12:54:49.000000000
-0500
+++ ./tools/python/xen/lowlevel/xc/xc.c 2006-11-27 14:05:25.000000000 -0500
@@ -705,6 +705,21 @@ static PyObject *pyxc_domain_setmaxmem(X
return zero;
}
+static PyObject *pyxc_domain_set_memmap_limit(XcObject *self, PyObject *args)
+{
+ uint32_t dom;
+ unsigned int maplimit_kb;
+
+ if (!PyArg_ParseTuple(args, "ii", &dom, &maplimit_kb))
+ return NULL;
+
+ if (xc_domain_set_memmap_limit(self->xc_handle, dom, maplimit_kb) != 0)
+ return PyErr_SetFromErrno(xc_error);
+
+ Py_INCREF(zero);
+ return zero;
+}
+
static PyObject *pyxc_domain_memory_increase_reservation(XcObject *self,
PyObject *args,
PyObject *kwds)
@@ -1082,6 +1097,14 @@ static PyMethodDef pyxc_methods[] = {
" maxmem_kb [int]: .\n"
"Returns: [int] 0 on success; -1 on error.\n" },
+ { "domain_set_memmap_limit",
+ (PyCFunction)pyxc_domain_set_memmap_limit,
+ METH_VARARGS, "\n"
+ "Set a domain's physical memory mappping limit\n"
+ " dom [int]: Identifier of domain.\n"
+ " map_limitkb [int]: .\n"
+ "Returns: [int] 0 on success; -1 on error.\n" },
+
{ "domain_memory_increase_reservation",
(PyCFunction)pyxc_domain_memory_increase_reservation,
METH_VARARGS | METH_KEYWORDS, "\n"
--- ./tools/python/xen/xend/XendDomainInfo.py.orig 2006-11-27
12:57:15.000000000 -0500
+++ ./tools/python/xen/xend/XendDomainInfo.py 2006-11-27 13:58:47.000000000
-0500
@@ -1330,6 +1330,9 @@ class XendDomainInfo:
# set memory limit
xc.domain_setmaxmem(self.domid, maxmem)
+
+ # set physical mapping limit
+ xc.domain_set_memmap_limit(self.domid, maxmem)
# Make sure there's enough RAM available for the domain
balloon.free(memory + shadow)
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