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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Make xc_linux_build() load the initrd page-by-page rather
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID d4a2af362e5eae4d201e2b02366948cf87a57e2a
# Parent a1fcee3b2abe44e6cece13a91f1bf012008bf2b0
Make xc_linux_build() load the initrd page-by-page rather
than all in one go, to conserve memory. This always has been
the behaviour, but it was changed by a changeset earlier today.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r a1fcee3b2abe -r d4a2af362e5e tools/libxc/xc_hvm_build.c
--- a/tools/libxc/xc_hvm_build.c Thu Mar 9 13:35:36 2006
+++ b/tools/libxc/xc_hvm_build.c Thu Mar 9 14:16:35 2006
@@ -641,7 +641,7 @@
if ( (image_buffer == NULL) || (image_size == 0) )
{
ERROR("kernel image buffer not present");
- return -EINVAL;
+ return -1;
}
img = xc_inflate_buffer(image_buffer, image_size, &img_len);
diff -r a1fcee3b2abe -r d4a2af362e5e tools/libxc/xc_linux_build.c
--- a/tools/libxc/xc_linux_build.c Thu Mar 9 13:35:36 2006
+++ b/tools/libxc/xc_linux_build.c Thu Mar 9 14:16:35 2006
@@ -45,6 +45,15 @@
#ifdef __ia64__
#define probe_aout9(image,image_size,load_funcs) 1
#endif
+
+struct initrd_info {
+ enum { INITRD_none, INITRD_file, INITRD_mem } type;
+ unsigned long len;
+ union {
+ gzFile file_handle;
+ char *mem_addr;
+ } u;
+};
static const char *feature_names[XENFEAT_NR_SUBMAPS*32] = {
[XENFEAT_writable_page_tables] = "writable_page_tables",
@@ -127,6 +136,42 @@
{
ERROR( "Unrecognized image format" );
return -EINVAL;
+ }
+
+ return 0;
+}
+
+int load_initrd(int xc_handle, domid_t dom,
+ struct initrd_info *initrd,
+ unsigned long physbase,
+ unsigned long *phys_to_mach)
+{
+ char page[PAGE_SIZE];
+ unsigned long pfn_start, pfn, nr_pages;
+
+ if ( initrd->type == INITRD_none )
+ return 0;
+
+ pfn_start = physbase >> PAGE_SHIFT;
+ nr_pages = (initrd->len + PAGE_SIZE - 1) >> PAGE_SHIFT;
+
+ for ( pfn = pfn_start; pfn < (pfn_start + nr_pages); pfn++ )
+ {
+ if ( initrd->type == INITRD_mem )
+ {
+ xc_copy_to_domain_page(
+ xc_handle, dom, phys_to_mach[pfn],
+ &initrd->u.mem_addr[(pfn - pfn_start) << PAGE_SHIFT]);
+ }
+ else
+ {
+ if ( gzread(initrd->u.file_handle, page, PAGE_SIZE) == -1 )
+ {
+ PERROR("Error reading initrd image, could not");
+ return -EINVAL;
+ }
+ xc_copy_to_domain_page(xc_handle, dom, phys_to_mach[pfn], page);
+ }
}
return 0;
@@ -407,7 +452,7 @@
static int setup_guest(int xc_handle,
uint32_t dom,
const char *image, unsigned long image_size,
- const char *initrd, unsigned long initrd_len,
+ struct initrd_info *initrd,
unsigned long nr_pages,
unsigned long *pvsi, unsigned long *pvke,
unsigned long *pvss, vcpu_guest_context_t *ctxt,
@@ -441,7 +486,7 @@
dsi.v_start = round_pgdown(dsi.v_start);
vinitrd_start = round_pgup(dsi.v_end);
- vinitrd_end = vinitrd_start + initrd_len;
+ vinitrd_end = vinitrd_start + initrd->len;
v_end = round_pgup(vinitrd_end);
start_page = dsi.v_start >> PAGE_SHIFT;
@@ -452,7 +497,8 @@
goto error_out;
}
- if ( xc_ia64_get_pfn_list(xc_handle, dom, page_array, start_page, pgnr) !=
pgnr )
+ if ( xc_ia64_get_pfn_list(xc_handle, dom, page_array,
+ start_page, pgnr) != pgnr )
{
PERROR("Could not get the page frame list");
goto error_out;
@@ -472,17 +518,9 @@
(load_funcs.loadimage)(image, image_size, xc_handle, dom, page_array,
&dsi);
- /* Load the initial ramdisk image, if present */
- if ( initrd_len != 0 )
- {
- /* Pages are not contiguous, so do the copy one page at a time */
- for ( i = (vinitrd_start - dsi.v_start), offset = 0;
- i < (vinitrd_end - dsi.v_start);
- i += PAGE_SIZE, offset += PAGE_SIZE )
- xc_copy_to_domain_page(xc_handle, dom,
- page_array[i>>PAGE_SHIFT],
- &initrd[offset]);
- }
+ if ( load_initrd(xc_handle, dom, initrd,
+ vinitrd_start - dsi.v_start, page_array) )
+ goto error_out;
*pvke = dsi.v_kernentry;
@@ -513,10 +551,10 @@
start_info->console_mfn = nr_pages - 1;
start_info->console_evtchn = console_evtchn;
start_info->nr_pages = nr_pages; // FIXME?: nr_pages - 2 ????
- if ( initrd_len != 0 )
+ if ( initrd->len != 0 )
{
ctxt->initrd.start = vinitrd_start;
- ctxt->initrd.size = initrd_len;
+ ctxt->initrd.size = initrd->len;
}
else
{
@@ -541,7 +579,7 @@
static int setup_guest(int xc_handle,
uint32_t dom,
const char *image, unsigned long image_size,
- const char *initrd, unsigned long initrd_len,
+ struct initrd_info *initrd,
unsigned long nr_pages,
unsigned long *pvsi, unsigned long *pvke,
unsigned long *pvss, vcpu_guest_context_t *ctxt,
@@ -610,7 +648,7 @@
* which we solve by exhaustive search.
*/
vinitrd_start = round_pgup(dsi.v_end);
- vinitrd_end = vinitrd_start + initrd_len;
+ vinitrd_end = vinitrd_start + initrd->len;
vphysmap_start = round_pgup(vinitrd_end);
vphysmap_end = vphysmap_start + (nr_pages * sizeof(unsigned long));
vstartinfo_start = round_pgup(vphysmap_end);
@@ -731,20 +769,12 @@
}
}
- shadow_mode_enabled = test_feature_bit(XENFEAT_auto_translated_physmap,
required_features);
-
- /* Load the initial ramdisk image, if present. */
- if ( initrd_len != 0 )
- {
- int offset;
- /* Pages are not contiguous, so do the inflation a page at a time. */
- for ( i = (vinitrd_start - dsi.v_start), offset = 0;
- i < (vinitrd_end - dsi.v_start);
- i += PAGE_SIZE, offset += PAGE_SIZE )
- xc_copy_to_domain_page(xc_handle, dom,
- page_array[i>>PAGE_SHIFT],
- &initrd[offset]);
- }
+ shadow_mode_enabled = test_feature_bit(
+ XENFEAT_auto_translated_physmap, required_features);
+
+ if ( load_initrd(xc_handle, dom, initrd,
+ vinitrd_start - dsi.v_start, page_array) )
+ goto error_out;
/* setup page tables */
#if defined(__i386__)
@@ -901,10 +931,10 @@
start_info->store_evtchn = store_evtchn;
start_info->console_mfn = guest_console_mfn;
start_info->console_evtchn = console_evtchn;
- if ( initrd_len != 0 )
+ if ( initrd->len != 0 )
{
start_info->mod_start = vinitrd_start;
- start_info->mod_len = initrd_len;
+ start_info->mod_len = initrd->len;
}
if ( cmdline != NULL )
{
@@ -961,8 +991,7 @@
uint32_t domid,
char *image,
unsigned long image_size,
- char *initrd,
- unsigned long initrd_len,
+ struct initrd_info *initrd,
const char *cmdline,
const char *features,
unsigned long flags,
@@ -1016,7 +1045,7 @@
memset(ctxt, 0, sizeof(*ctxt));
if ( setup_guest(xc_handle, domid, image, image_size,
- initrd, initrd_len,
+ initrd,
nr_pages,
&vstartinfo_start, &vkern_entry,
&vstack_start, ctxt, cmdline,
@@ -1132,14 +1161,15 @@
unsigned long *console_mfn)
{
int sts;
- char *img_buf, *ram_buf;
- unsigned long img_len, ram_len;
+ char *img_buf;
+ unsigned long img_len;
+ struct initrd_info initrd_info = { .type = INITRD_none };
/* A kernel buffer is required */
if ( (image_buffer == NULL) || (image_size == 0) )
{
ERROR("kernel image buffer not present");
- return EINVAL;
+ return -1;
}
/* If it's gzipped, inflate it; otherwise, use as is */
@@ -1149,28 +1179,25 @@
if ( img_buf == NULL )
{
ERROR("unable to inflate kernel image buffer");
- return EFAULT;
+ return -1;
}
/* RAM disks are optional; if we get one, inflate it */
if ( initrd != NULL )
{
- ram_buf = xc_inflate_buffer(initrd, initrd_len, &ram_len);
- if ( ram_buf == NULL )
+ initrd_info.type = INITRD_mem;
+ initrd_info.u.mem_addr = xc_inflate_buffer(
+ initrd, initrd_len, &initrd_info.len);
+ if ( initrd_info.u.mem_addr == NULL )
{
ERROR("unable to inflate ram disk buffer");
sts = -1;
goto out;
}
}
- else
- {
- ram_buf = (char *)initrd;
- ram_len = initrd_len;
- }
sts = xc_linux_build_internal(xc_handle, domid, img_buf, img_len,
- ram_buf, ram_len, cmdline, features, flags,
+ &initrd_info, cmdline, features, flags,
store_evtchn, store_mfn,
console_evtchn, console_mfn);
@@ -1180,8 +1207,9 @@
/* Don't unnecessarily annoy/surprise/confound the caller */
if ( (img_buf != NULL) && (img_buf != image_buffer) )
free(img_buf);
- if ( (ram_buf != NULL) && (ram_buf != initrd) )
- free(ram_buf);
+ if ( (initrd_info.u.mem_addr != NULL) &&
+ (initrd_info.u.mem_addr != initrd) )
+ free(initrd_info.u.mem_addr);
return sts;
}
@@ -1198,28 +1226,44 @@
unsigned int console_evtchn,
unsigned long *console_mfn)
{
- char *image, *ram = NULL;
- unsigned long image_size, ram_size = 0;
- int sts;
+ char *image = NULL;
+ unsigned long image_size;
+ struct initrd_info initrd_info = { .type = INITRD_none };
+ int fd = -1, sts = -1;
if ( (image_name == NULL) ||
((image = xc_read_image(image_name, &image_size)) == NULL ))
return -1;
- if ( (initrd_name != NULL) && (strlen(initrd_name) != 0) &&
- ((ram = xc_read_image(initrd_name, &ram_size)) == NULL) )
- {
- free(image);
- return -1;
+ if ( (initrd_name != NULL) && (strlen(initrd_name) != 0) )
+ {
+ initrd_info.type = INITRD_file;
+
+ if ( (fd = open(initrd_name, O_RDONLY)) < 0 )
+ {
+ PERROR("Could not open the initial ramdisk image");
+ goto error_out;
+ }
+
+ initrd_info.len = xc_get_filesz(fd);
+ if ( (initrd_info.u.file_handle = gzdopen(fd, "rb")) == NULL )
+ {
+ PERROR("Could not allocate decompression state for initrd");
+ goto error_out;
+ }
}
sts = xc_linux_build_internal(xc_handle, domid, image, image_size,
- ram, ram_size, cmdline, features, flags,
+ &initrd_info, cmdline, features, flags,
store_evtchn, store_mfn,
console_evtchn, console_mfn);
+ error_out:
free(image);
- free(ram);
+ if ( fd >= 0 )
+ close(fd);
+ if ( initrd_info.u.file_handle )
+ gzclose(initrd_info.u.file_handle);
return sts;
}
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