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a36045afa893df1700a1ebe0668f1c5bce1d3db8
xen/tools/libxc/xc_hvm_build.c
T
Keir Fraser a390e6128b x86, hvm: stdvga improvements 
* enables linear framebuffer and VBE 3.0 extensions.
* add a number of new resolutions, up to 2560x1600, and including
* widescreen modes common to modern displays.
* Introduce configurable video ram size through the "videoram" config
* file option, shrinking default video ram used to 4 Megs (thus
* eliminating 4 wasted megs/VM that have been the case until now), but
* allowing users to specify up to 16 Megs of vram, to support the
* extreme high resolutions such as 2560x1600x32.

Signed-off-by: Trolle Selander <trolle.selander@eu.citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
2009-01-14 10:51:58 +00:00

450 lines
14 KiB
C
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/******************************************************************************
* xc_hvm_build.c
*/
#include <stddef.h>
#include <inttypes.h>
#include <stdlib.h>
#include <unistd.h>
#include <zlib.h>
#include "xg_private.h"
#include "xc_private.h"
#include <xen/foreign/x86_32.h>
#include <xen/foreign/x86_64.h>
#include <xen/hvm/hvm_info_table.h>
#include <xen/hvm/params.h>
#include <xen/hvm/e820.h>
#include <xen/libelf/libelf.h>
#define SUPERPAGE_PFN_SHIFT 9
#define SUPERPAGE_NR_PFNS (1UL << SUPERPAGE_PFN_SHIFT)
#define SPECIALPAGE_BUFIOREQ 0
#define SPECIALPAGE_XENSTORE 1
#define SPECIALPAGE_IOREQ 2
#define SPECIALPAGE_IDENT_PT 3
#define SPECIALPAGE_SHINFO 4
#define NR_SPECIAL_PAGES 5
#define special_pfn(x) (0xff000u - NR_SPECIAL_PAGES + (x))
static void build_hvm_info(void *hvm_info_page, uint64_t mem_size)
{
struct hvm_info_table *hvm_info = (struct hvm_info_table *)
(((unsigned char *)hvm_info_page) + HVM_INFO_OFFSET);
uint64_t lowmem_end = mem_size, highmem_end = 0;
uint8_t sum;
int i;
if ( lowmem_end > HVM_BELOW_4G_RAM_END )
{
highmem_end = lowmem_end + (1ull<<32) - HVM_BELOW_4G_RAM_END;
lowmem_end = HVM_BELOW_4G_RAM_END;
}
memset(hvm_info_page, 0, PAGE_SIZE);
/* Fill in the header. */
strncpy(hvm_info->signature, "HVM INFO", 8);
hvm_info->length = sizeof(struct hvm_info_table);
/* Sensible defaults: these can be overridden by the caller. */
hvm_info->acpi_enabled = 1;
hvm_info->apic_mode = 1;
hvm_info->nr_vcpus = 1;
/* Memory parameters. */
hvm_info->low_mem_pgend = lowmem_end >> PAGE_SHIFT;
hvm_info->high_mem_pgend = highmem_end >> PAGE_SHIFT;
hvm_info->reserved_mem_pgstart = special_pfn(0);
/* Finish with the checksum. */
for ( i = 0, sum = 0; i < hvm_info->length; i++ )
sum += ((uint8_t *)hvm_info)[i];
hvm_info->checksum = -sum;
}
static int loadelfimage(
struct elf_binary *elf, int xch, uint32_t dom, unsigned long *parray)
{
privcmd_mmap_entry_t *entries = NULL;
size_t pages = (elf->pend - elf->pstart + PAGE_SIZE - 1) >> PAGE_SHIFT;
int i, rc = -1;
/* Map address space for initial elf image. */
entries = calloc(pages, sizeof(privcmd_mmap_entry_t));
if ( entries == NULL )
goto err;
for ( i = 0; i < pages; i++ )
entries[i].mfn = parray[(elf->pstart >> PAGE_SHIFT) + i];
elf->dest = xc_map_foreign_ranges(
xch, dom, pages << PAGE_SHIFT, PROT_READ | PROT_WRITE, 1 << PAGE_SHIFT,
entries, pages);
if ( elf->dest == NULL )
goto err;
/* Load the initial elf image. */
elf_load_binary(elf);
rc = 0;
munmap(elf->dest, pages << PAGE_SHIFT);
elf->dest = NULL;
err:
free(entries);
return rc;
}
static int setup_guest(int xc_handle,
uint32_t dom, int memsize, int target,
char *image, unsigned long image_size)
{
xen_pfn_t *page_array = NULL;
unsigned long i, nr_pages = (unsigned long)memsize << (20 - PAGE_SHIFT);
unsigned long target_pages = (unsigned long)target << (20 - PAGE_SHIFT);
unsigned long pod_pages = 0;
unsigned long entry_eip, cur_pages;
struct xen_add_to_physmap xatp;
struct shared_info *shared_info;
void *hvm_info_page;
uint32_t *ident_pt;
struct elf_binary elf;
uint64_t v_start, v_end;
int rc;
xen_capabilities_info_t caps;
int pod_mode = 0;
/* An HVM guest must be initialised with at least 2MB memory. */
if ( memsize < 2 || target < 2 )
goto error_out;
if ( memsize > target )
pod_mode = 1;
if ( elf_init(&elf, image, image_size) != 0 )
goto error_out;
elf_parse_binary(&elf);
v_start = 0;
v_end = (unsigned long long)memsize << 20;
if ( xc_version(xc_handle, XENVER_capabilities, &caps) != 0 )
{
PERROR("Could not get Xen capabilities\n");
goto error_out;
}
if ( (elf.pstart & (PAGE_SIZE - 1)) != 0 )
{
PERROR("Guest OS must load to a page boundary.\n");
goto error_out;
}
IPRINTF("VIRTUAL MEMORY ARRANGEMENT:\n"
" Loader: %016"PRIx64"->%016"PRIx64"\n"
" TOTAL: %016"PRIx64"->%016"PRIx64"\n"
" ENTRY ADDRESS: %016"PRIx64"\n",
elf.pstart, elf.pend,
v_start, v_end,
elf_uval(&elf, elf.ehdr, e_entry));
if ( (page_array = malloc(nr_pages * sizeof(xen_pfn_t))) == NULL )
{
PERROR("Could not allocate memory.\n");
goto error_out;
}
for ( i = 0; i < nr_pages; i++ )
page_array[i] = i;
for ( i = HVM_BELOW_4G_RAM_END >> PAGE_SHIFT; i < nr_pages; i++ )
page_array[i] += HVM_BELOW_4G_MMIO_LENGTH >> PAGE_SHIFT;
/*
* Allocate memory for HVM guest, skipping VGA hole 0xA0000-0xC0000.
* We allocate pages in batches of no more than 8MB to ensure that
* we can be preempted and hence dom0 remains responsive.
*/
rc = xc_domain_memory_populate_physmap(
xc_handle, dom, 0xa0, 0, 0, &page_array[0x00]);
cur_pages = 0xc0;
while ( (rc == 0) && (nr_pages > cur_pages) )
{
/* Clip count to maximum 8MB extent. */
unsigned long count = nr_pages - cur_pages;
if ( count > 2048 )
count = 2048;
/* Clip partial superpage extents to superpage boundaries. */
if ( ((cur_pages & (SUPERPAGE_NR_PFNS-1)) != 0) &&
(count > (-cur_pages & (SUPERPAGE_NR_PFNS-1))) )
count = -cur_pages & (SUPERPAGE_NR_PFNS-1); /* clip s.p. tail */
else if ( ((count & (SUPERPAGE_NR_PFNS-1)) != 0) &&
(count > SUPERPAGE_NR_PFNS) )
count &= ~(SUPERPAGE_NR_PFNS - 1); /* clip non-s.p. tail */
/* Attempt to allocate superpage extents. */
if ( ((count | cur_pages) & (SUPERPAGE_NR_PFNS - 1)) == 0 )
{
long done;
xen_pfn_t sp_extents[count >> SUPERPAGE_PFN_SHIFT];
struct xen_memory_reservation sp_req = {
.nr_extents = count >> SUPERPAGE_PFN_SHIFT,
.extent_order = SUPERPAGE_PFN_SHIFT,
.domid = dom
};
if ( pod_mode )
sp_req.mem_flags = XENMEMF_populate_on_demand;
set_xen_guest_handle(sp_req.extent_start, sp_extents);
for ( i = 0; i < sp_req.nr_extents; i++ )
sp_extents[i] = page_array[cur_pages+(i<<SUPERPAGE_PFN_SHIFT)];
done = xc_memory_op(xc_handle, XENMEM_populate_physmap, &sp_req);
if ( done > 0 )
{
done <<= SUPERPAGE_PFN_SHIFT;
if ( pod_mode && target_pages > cur_pages )
{
int d = target_pages - cur_pages;
pod_pages += ( done < d ) ? done : d;
}
cur_pages += done;
count -= done;
}
}
/* Fall back to 4kB extents. */
if ( count != 0 )
{
rc = xc_domain_memory_populate_physmap(
xc_handle, dom, count, 0, 0, &page_array[cur_pages]);
cur_pages += count;
if ( pod_mode )
pod_pages -= count;
}
}
if ( pod_mode )
rc = xc_domain_memory_set_pod_target(xc_handle,
dom,
pod_pages,
NULL, NULL, NULL);
if ( rc != 0 )
{
PERROR("Could not allocate memory for HVM guest.\n");
goto error_out;
}
if ( loadelfimage(&elf, xc_handle, dom, page_array) != 0 )
goto error_out;
if ( (hvm_info_page = xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ | PROT_WRITE,
HVM_INFO_PFN)) == NULL )
goto error_out;
build_hvm_info(hvm_info_page, v_end);
munmap(hvm_info_page, PAGE_SIZE);
/* Map and initialise shared_info page. */
xatp.domid = dom;
xatp.space = XENMAPSPACE_shared_info;
xatp.idx = 0;
xatp.gpfn = special_pfn(SPECIALPAGE_SHINFO);
if ( (xc_memory_op(xc_handle, XENMEM_add_to_physmap, &xatp) != 0) ||
((shared_info = xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ | PROT_WRITE,
special_pfn(SPECIALPAGE_SHINFO))) == NULL) )
goto error_out;
memset(shared_info, 0, PAGE_SIZE);
/* NB. evtchn_upcall_mask is unused: leave as zero. */
memset(&shared_info->evtchn_mask[0], 0xff,
sizeof(shared_info->evtchn_mask));
munmap(shared_info, PAGE_SIZE);
/* Allocate and clear special pages. */
for ( i = 0; i < NR_SPECIAL_PAGES; i++ )
{
xen_pfn_t pfn = special_pfn(i);
if ( i == SPECIALPAGE_SHINFO )
continue;
rc = xc_domain_memory_populate_physmap(xc_handle, dom, 1, 0, 0, &pfn);
if ( rc != 0 )
{
PERROR("Could not allocate %d'th special page.\n", i);
goto error_out;
}
if ( xc_clear_domain_page(xc_handle, dom, special_pfn(i)) )
goto error_out;
}
xc_set_hvm_param(xc_handle, dom, HVM_PARAM_STORE_PFN,
special_pfn(SPECIALPAGE_XENSTORE));
xc_set_hvm_param(xc_handle, dom, HVM_PARAM_BUFIOREQ_PFN,
special_pfn(SPECIALPAGE_BUFIOREQ));
xc_set_hvm_param(xc_handle, dom, HVM_PARAM_IOREQ_PFN,
special_pfn(SPECIALPAGE_IOREQ));
/*
* Identity-map page table is required for running with CR0.PG=0 when
* using Intel EPT. Create a 32-bit non-PAE page directory of superpages.
*/
if ( (ident_pt = xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ | PROT_WRITE,
special_pfn(SPECIALPAGE_IDENT_PT))) == NULL )
goto error_out;
for ( i = 0; i < PAGE_SIZE / sizeof(*ident_pt); i++ )
ident_pt[i] = ((i << 22) | _PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
_PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
munmap(ident_pt, PAGE_SIZE);
xc_set_hvm_param(xc_handle, dom, HVM_PARAM_IDENT_PT,
special_pfn(SPECIALPAGE_IDENT_PT) << PAGE_SHIFT);
/* Insert JMP <rel32> instruction at address 0x0 to reach entry point. */
entry_eip = elf_uval(&elf, elf.ehdr, e_entry);
if ( entry_eip != 0 )
{
char *page0 = xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ | PROT_WRITE, 0);
if ( page0 == NULL )
goto error_out;
page0[0] = 0xe9;
*(uint32_t *)&page0[1] = entry_eip - 5;
munmap(page0, PAGE_SIZE);
}
free(page_array);
return 0;
error_out:
free(page_array);
return -1;
}
static int xc_hvm_build_internal(int xc_handle,
uint32_t domid,
int memsize,
int target,
char *image,
unsigned long image_size)
{
if ( (image == NULL) || (image_size == 0) )
{
ERROR("Image required");
return -1;
}
return setup_guest(xc_handle, domid, memsize, target, image, image_size);
}
static inline int is_loadable_phdr(Elf32_Phdr *phdr)
{
return ((phdr->p_type == PT_LOAD) &&
((phdr->p_flags & (PF_W|PF_X)) != 0));
}
/* xc_hvm_build:
* Create a domain for a virtualized Linux, using files/filenames.
*/
int xc_hvm_build(int xc_handle,
uint32_t domid,
int memsize,
const char *image_name)
{
char *image;
int sts;
unsigned long image_size;
if ( (image_name == NULL) ||
((image = xc_read_image(image_name, &image_size)) == NULL) )
return -1;
sts = xc_hvm_build_internal(xc_handle, domid, memsize, memsize, image, image_size);
free(image);
return sts;
}
/* xc_hvm_build_target_mem:
* Create a domain for a pre-ballooned virtualized Linux, using
* files/filenames. If target < memsize, domain is created with
* memsize pages marked populate-on-demand, and with a PoD cache size
* of target. If target == memsize, pages are populated normally.
*/
int xc_hvm_build_target_mem(int xc_handle,
uint32_t domid,
int memsize,
int target,
const char *image_name)
{
char *image;
int sts;
unsigned long image_size;
if ( (image_name == NULL) ||
((image = xc_read_image(image_name, &image_size)) == NULL) )
return -1;
sts = xc_hvm_build_internal(xc_handle, domid, memsize, target, image, image_size);
free(image);
return sts;
}
/* xc_hvm_build_mem:
* Create a domain for a virtualized Linux, using memory buffers.
*/
int xc_hvm_build_mem(int xc_handle,
uint32_t domid,
int memsize,
const char *image_buffer,
unsigned long image_size)
{
int sts;
unsigned long img_len;
char *img;
/* Validate that there is a kernel buffer */
if ( (image_buffer == NULL) || (image_size == 0) )
{
ERROR("kernel image buffer not present");
return -1;
}
img = xc_inflate_buffer(image_buffer, image_size, &img_len);
if ( img == NULL )
{
ERROR("unable to inflate ram disk buffer");
return -1;
}
sts = xc_hvm_build_internal(xc_handle, domid, memsize, memsize,
img, img_len);
/* xc_inflate_buffer may return the original buffer pointer (for
for already inflated buffers), so exercise some care in freeing */
if ( (img != NULL) && (img != image_buffer) )
free(img);
return sts;
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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