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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Improved "PGDs must be under 4GB" handling for PAE.
# HG changeset patch
# User iap10@xxxxxxxxxxxxxxxxxxxxx
# Node ID 5db85ba1c4e034a84aaea053052719320cefebfb
# Parent 1f4863861d18ded485b5f126d592e2aad87a831d
Improved "PGDs must be under 4GB" handling for PAE.
Signed-off-by: ian@xxxxxxxxxxxxx
diff -r 1f4863861d18 -r 5db85ba1c4e0 tools/libxc/xc_domain.c
--- a/tools/libxc/xc_domain.c Thu Sep 8 17:35:44 2005
+++ b/tools/libxc/xc_domain.c Thu Sep 8 17:36:23 2005
@@ -262,28 +262,66 @@
int xc_domain_memory_increase_reservation(int xc_handle,
u32 domid,
- unsigned long mem_kb,
+ unsigned long nr_extents,
unsigned int extent_order,
- unsigned int address_bits)
+ unsigned int address_bits,
+ unsigned long *extent_start)
{
int err;
- unsigned int npages = mem_kb / (PAGE_SIZE/1024);
struct xen_memory_reservation reservation = {
- .nr_extents = npages,
- .extent_order = extent_order,
+ .extent_start = extent_start, /* may be NULL */
+ .nr_extents = nr_extents,
+ .extent_order = extent_order,
.address_bits = address_bits,
.domid = domid
};
err = xc_memory_op(xc_handle, XENMEM_increase_reservation, &reservation);
- if (err == npages)
+ if (err == nr_extents)
return 0;
if (err > 0) {
- fprintf(stderr,"Failed alocation for dom %d : %d pages order %d
addr_bits %d\n",
- domid, npages, extent_order, address_bits);
+ fprintf(stderr,"Failed alocation for dom %d : %ld pages order %d
addr_bits %d\n",
+ domid, nr_extents, extent_order,
address_bits);
errno = ENOMEM;
err = -1;
}
return err;
}
+
+int xc_domain_memory_decrease_reservation(int xc_handle,
+ u32 domid,
+ unsigned long nr_extents,
+ unsigned int extent_order,
+ unsigned long *extent_start)
+{
+ int err;
+ struct xen_memory_reservation reservation = {
+ .extent_start = extent_start,
+ .nr_extents = nr_extents,
+ .extent_order = extent_order,
+ .address_bits = 0,
+ .domid = domid
+ };
+
+ if (extent_start == NULL)
+ {
+ fprintf(stderr,"decrease_reservation extent_start is NULL!\n");
+ errno = EINVAL;
+ err = -1;
+ goto out;
+ }
+
+ err = xc_memory_op(xc_handle, XENMEM_increase_reservation, &reservation);
+ if (err == nr_extents)
+ return 0;
+
+ if (err > 0) {
+ fprintf(stderr,"Failed de-alocation for dom %d : %ld pages order %d\n",
+ domid, nr_extents, extent_order);
+ errno = EBUSY;
+ err = -1;
+ }
+out:
+ return err;
+}
diff -r 1f4863861d18 -r 5db85ba1c4e0 tools/libxc/xc_linux_build.c
--- a/tools/libxc/xc_linux_build.c Thu Sep 8 17:35:44 2005
+++ b/tools/libxc/xc_linux_build.c Thu Sep 8 17:36:23 2005
@@ -136,11 +136,24 @@
/* First allocate page for page dir. */
ppt_alloc = (vpt_start - dsi_v_start) >> PAGE_SHIFT;
+
+ if ( page_array[ppt_alloc] > 0xfffff )
+ {
+ unsigned long nmfn;
+ nmfn = xc_make_page_below_4G( xc_handle, dom, page_array[ppt_alloc] );
+ if ( nmfn == 0 )
+ {
+ fprintf(stderr, "Couldn't get a page below 4GB :-(\n");
+ goto error_out;
+ }
+ page_array[ppt_alloc] = nmfn;
+ }
+
alloc_pt(l3tab, vl3tab);
vl3e = &vl3tab[l3_table_offset_pae(dsi_v_start)];
ctxt->ctrlreg[3] = l3tab;
- if(l3tab>0xfffff000)
+ if(l3tab>0xfffff000ULL)
{
fprintf(stderr,"L3TAB = %llx above 4GB!\n",l3tab);
goto error_out;
diff -r 1f4863861d18 -r 5db85ba1c4e0 tools/libxc/xc_linux_restore.c
--- a/tools/libxc/xc_linux_restore.c Thu Sep 8 17:35:44 2005
+++ b/tools/libxc/xc_linux_restore.c Thu Sep 8 17:36:23 2005
@@ -149,7 +149,7 @@
}
err = xc_domain_memory_increase_reservation(xc_handle, dom,
- nr_pfns * PAGE_SIZE / 1024, 0,
0); //FIX ME
+ nr_pfns, 0, 0, NULL);
if (err != 0) {
ERR("Failed to increase reservation by %lx\n",
nr_pfns * PAGE_SIZE / 1024);
diff -r 1f4863861d18 -r 5db85ba1c4e0 tools/libxc/xc_private.c
--- a/tools/libxc/xc_private.c Thu Sep 8 17:35:44 2005
+++ b/tools/libxc/xc_private.c Thu Sep 8 17:36:23 2005
@@ -427,3 +427,21 @@
{
return do_xen_version(xc_handle, cmd, arg);
}
+
+unsigned long xc_make_page_below_4G(int xc_handle, u32 domid,
+ unsigned long mfn)
+{
+ unsigned long new_mfn;
+ if ( xc_domain_memory_decrease_reservation(
+ xc_handle, domid, 1, 0, &mfn ) != 1 )
+ {
+ fprintf(stderr,"xc_make_page_below_4G decrease failed. mfn=%lx\n",mfn);
+ return 0;
+ }
+ if ( xc_domain_memory_increase_reservation( xc_handle, domid, 1, 0, 32,
&new_mfn ) != 1 )
+ {
+ fprintf(stderr,"xc_make_page_below_4G increase failed. mfn=%lx\n",mfn);
+ return 0;
+ }
+ return new_mfn;
+}
diff -r 1f4863861d18 -r 5db85ba1c4e0 tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h Thu Sep 8 17:35:44 2005
+++ b/tools/libxc/xenctrl.h Thu Sep 8 17:36:23 2005
@@ -387,9 +387,19 @@
int xc_domain_memory_increase_reservation(int xc_handle,
u32 domid,
- unsigned long mem_kb,
+ unsigned long nr_extents,
unsigned int extent_order,
- unsigned int address_bits);
+ unsigned int address_bits,
+ unsigned long *extent_start);
+
+int xc_domain_memory_decrease_reservation(int xc_handle,
+ u32 domid,
+ unsigned long nr_extents,
+ unsigned int extent_order,
+ unsigned long *extent_start);
+
+unsigned long xc_make_page_below_4G(int xc_handle, u32 domid,
+ unsigned long mfn);
typedef dom0_perfc_desc_t xc_perfc_desc_t;
/* IMPORTANT: The caller is responsible for mlock()'ing the @desc array. */
diff -r 1f4863861d18 -r 5db85ba1c4e0 tools/python/xen/lowlevel/xc/xc.c
--- a/tools/python/xen/lowlevel/xc/xc.c Thu Sep 8 17:35:44 2005
+++ b/tools/python/xen/lowlevel/xc/xc.c Thu Sep 8 17:36:23 2005
@@ -842,6 +842,7 @@
u32 dom;
unsigned long mem_kb;
unsigned int extent_order = 0 , address_bits = 0;
+ unsigned long nr_extents;
static char *kwd_list[] = { "dom", "mem_kb", "extent_order",
"address_bits", NULL };
@@ -849,8 +850,12 @@
&dom, &mem_kb, &extent_order,
&address_bits) )
return NULL;
+ /* round down to nearest power of 2. Assume callers using extent_order>0
+ know what they are doing */
+ nr_extents = (mem_kb / (XC_PAGE_SIZE/1024)) >> extent_order;
if ( xc_domain_memory_increase_reservation(xc->xc_handle, dom,
- mem_kb, extent_order, address_bits) )
+ nr_extents, extent_order,
+ address_bits, NULL) )
return PyErr_SetFromErrno(xc_error);
Py_INCREF(zero);
diff -r 1f4863861d18 -r 5db85ba1c4e0 tools/python/xen/xend/image.py
--- a/tools/python/xen/xend/image.py Thu Sep 8 17:35:44 2005
+++ b/tools/python/xen/xend/image.py Thu Sep 8 17:36:23 2005
@@ -160,8 +160,9 @@
try:
# Give the domain some memory below 4GB
- lmem_kb = 4096
- xc.domain_memory_increase_reservation(dom, min(lmem_kb,mem_kb), 0,
32)
+ lmem_kb = 0
+ if lmem_kb > 0:
+ xc.domain_memory_increase_reservation(dom,
min(lmem_kb,mem_kb), 0, 32)
if mem_kb > lmem_kb:
xc.domain_memory_increase_reservation(dom, mem_kb-lmem_kb, 0,
0)
except:
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