[IA64] introduce DOM0VP_get_memmap hypercall.
introduce new dom0vp hypercall, DOM0VP_get_memmap,
to get memmap of a given domain without race.
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
diff -r 088bc049f889 xen/arch/ia64/xen/dom0_ops.c
--- a/xen/arch/ia64/xen/dom0_ops.c Thu Oct 02 15:24:18 2008 +0900
+++ b/xen/arch/ia64/xen/dom0_ops.c Thu Oct 02 15:25:22 2008 +0900
@@ -607,6 +607,12 @@
case IA64_DOM0VP_unexpose_foreign_p2m:
ret = dom0vp_unexpose_foreign_p2m(d, arg0, arg1);
break;
+ case IA64_DOM0VP_get_memmap: {
+ XEN_GUEST_HANDLE(char) hnd;
+ set_xen_guest_handle(hnd, (char*)arg1);
+ ret = dom0vp_get_memmap((domid_t)arg0, hnd);
+ break;
+ }
default:
ret = -1;
printk("unknown dom0_vp_op 0x%lx\n", cmd);
diff -r 088bc049f889 xen/arch/ia64/xen/mm.c
--- a/xen/arch/ia64/xen/mm.c Thu Oct 02 15:24:18 2008 +0900
+++ b/xen/arch/ia64/xen/mm.c Thu Oct 02 15:25:22 2008 +0900
@@ -2465,6 +2465,49 @@
free_domheap_pages(page, order);
return ret;
}
+
+unsigned long
+dom0vp_get_memmap(domid_t domid, XEN_GUEST_HANDLE(char) buffer)
+{
+ unsigned long ret = 0;
+ struct domain *targ_d;
+
+ struct page_info *page = NULL;
+ unsigned long order;
+
+ struct xen_ia64_memmap_info *memmap_info;
+ unsigned long num_pages;
+
+ ret = rcu_lock_target_domain_by_id(domid, &targ_d);
+ if (ret != 0)
+ return ret;
+
+ memmap_lock(targ_d);
+
+ ret = memmap_copy_from(targ_d, &page, &order);
+ if (ret != 0)
+ goto out;
+
+ memmap_info = page_to_virt(page);
+ num_pages = targ_d->shared_info->arch.memmap_info_num_pages;
+ if ((num_pages << PAGE_SHIFT) - sizeof(*memmap_info) <
+ memmap_info->efi_memmap_size) {
+ ret = -EFAULT;
+ goto out;
+ }
+ if (copy_to_guest(buffer, (char*)memmap_info, sizeof(*memmap_info)) ||
+ copy_to_guest_offset(buffer, sizeof(*memmap_info),
+ (char*)memmap_info->memdesc,
+ memmap_info->efi_memmap_size))
+ ret = -EFAULT;
+
+ out:
+ memmap_unlock(targ_d);
+ if (page != NULL)
+ free_domheap_pages(page, order);
+
+ return ret;
+}
#endif
// grant table host mapping
diff -r 088bc049f889 xen/include/asm-ia64/mm.h
--- a/xen/include/asm-ia64/mm.h Thu Oct 02 15:24:18 2008 +0900
+++ b/xen/include/asm-ia64/mm.h Thu Oct 02 15:25:22 2008 +0900
@@ -448,6 +448,7 @@
extern void foreign_p2m_destroy(struct domain* d);
extern unsigned long dom0vp_expose_foreign_p2m(struct domain* dest_dom,
unsigned long dest_gpfn, domid_t domid, XEN_GUEST_HANDLE(char) buffer, unsigned
long flags);
extern unsigned long dom0vp_unexpose_foreign_p2m(struct domain* dest_dom,
unsigned long dest_gpfn, domid_t domid);
+extern unsigned long dom0vp_get_memmap(domid_t domid, XEN_GUEST_HANDLE(char)
buffer);
#else
#define expose_p2m_init() do { } while (0)
#define dom0vp_expose_p2m(d, conv_start_gpfn, assign_start_gpfn, expose_size,
granule_pfn) (-ENOSYS)
@@ -456,6 +457,7 @@
#define dom0vp_expose_foreign_p2m(dest_dom, dest_gpfn, domid, buffer, flags)
(-ENOSYS)
#define dom0vp_unexpose_foreign_p2m(dest_dom, dest_gpfn, domid)
(-ENOSYS)
#define __dom0vp_add_memdesc(d, memmap_info, memdesc) (-ENOSYS)
+#define dom0vp_get_memmap(domid, buffer) (-ENOSYS)
#endif
extern volatile unsigned long *mpt_table;
diff -r 088bc049f889 xen/include/public/arch-ia64.h
--- a/xen/include/public/arch-ia64.h Thu Oct 02 15:24:18 2008 +0900
+++ b/xen/include/public/arch-ia64.h Thu Oct 02 15:25:22 2008 +0900
@@ -463,6 +463,11 @@
/* unexpose the foreign domain's p2m table into privileged domain */
#define IA64_DOM0VP_unexpose_foreign_p2m 13
+/* get memmap_info and memmap. It is possible to map the page directly
+ by foreign page mapping, but there is a race between writer.
+ This hypercall avoids such race. */
+#define IA64_DOM0VP_get_memmap 14
+
// flags for page assignement to pseudo physical address space
#define _ASSIGN_readonly 0
#define ASSIGN_readonly (1UL << _ASSIGN_readonly)
memmap-info-get-memmap-0.patch
Description: Text Data
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