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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v5 02/14] libxc: Prepare a start info structure for hvmloader
... and load BIOS/UEFI firmware into guest memory.
This adds a new firmware module, system_firmware_module. It is loaded in
the guest memory and final location is provided to hvmloader via the
hvm_start_info struct.
This patch create the hvm_start_info struct for HVM guest that have a
device model, so this is now common code with HVM guest without device
model.
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
CC: boris.ostrovsky@xxxxxxxxxx
CC: roger.pau@xxxxxxxxxx
Changes in V5:
- in alloc_magic_pages_hvm, check dom->device_model only once instead of
twice (fold second if into previous else)
- rework add_module_to_list to make it easier to read
- also comment about the intended memory layout of start_info and the
modules
- in bootlate_hvm(), drop start_page and use start_info as they point to
the same address
- rename xc_dom_image.bios_module to xc_dom_image.system_firmware_module
- rename module name to "firmware" (was "bios")
Changes in V4:
- change title to suggest the change of beavior
- remove code to load acpi tables (dsdt)
- Update public/xen.h about hvm_start_info available on other HVM guest
in %ebx.
Changes in V3:
- rename acpi_table_module to full_acpi_module.
- factorise module loading, using new function to load existing optinal
module, this should not change anything
- should now use the same code to loads modules as for HVMlite VMs.
this avoid duplication of code.
- no more generic cmdline with a list of modules, each module have its name
in the module specific cmdline.
- scope change for common code between hvmlite and hvmloader
---
tools/libxc/include/xc_dom.h | 3 +
tools/libxc/xc_dom_hvmloader.c | 3 +
tools/libxc/xc_dom_x86.c | 152 +++++++++++++++++++++++++++++------------
xen/include/public/xen.h | 2 +-
4 files changed, 116 insertions(+), 44 deletions(-)
diff --git a/tools/libxc/include/xc_dom.h b/tools/libxc/include/xc_dom.h
index 6cb10c4..0629971 100644
--- a/tools/libxc/include/xc_dom.h
+++ b/tools/libxc/include/xc_dom.h
@@ -209,6 +209,9 @@ struct xc_dom_image {
/* If unset disables the setup of the IOREQ pages. */
bool device_model;
+ /* BIOS/Firmware passed to HVMLOADER */
+ struct xc_hvm_firmware_module system_firmware_module;
+
/* Extra ACPI tables passed to HVMLOADER */
struct xc_hvm_firmware_module acpi_module;
diff --git a/tools/libxc/xc_dom_hvmloader.c b/tools/libxc/xc_dom_hvmloader.c
index da8b995..cf2d57c 100644
--- a/tools/libxc/xc_dom_hvmloader.c
+++ b/tools/libxc/xc_dom_hvmloader.c
@@ -167,6 +167,9 @@ static int modules_init(struct xc_dom_image *dom)
{
int rc;
+ rc = module_init_one(dom, &dom->system_firmware_module,
+ "System Firmware module");
+ if ( rc ) goto err;
rc = module_init_one(dom, &dom->acpi_module, "ACPI module");
if ( rc ) goto err;
rc = module_init_one(dom, &dom->smbios_module, "SMBIOS module");
diff --git a/tools/libxc/xc_dom_x86.c b/tools/libxc/xc_dom_x86.c
index 021f8a8..f017fbd 100644
--- a/tools/libxc/xc_dom_x86.c
+++ b/tools/libxc/xc_dom_x86.c
@@ -69,6 +69,9 @@
#define round_up(addr, mask) ((addr) | (mask))
#define round_pg_up(addr) (((addr) + PAGE_SIZE_X86 - 1) & ~(PAGE_SIZE_X86 -
1))
+#define HVMLOADER_MODULE_MAX_COUNT 1
+#define HVMLOADER_MODULE_NAME_SIZE 10
+
struct xc_dom_params {
unsigned levels;
xen_vaddr_t vaddr_mask;
@@ -590,6 +593,7 @@ static int alloc_magic_pages_hvm(struct xc_dom_image *dom)
xen_pfn_t special_array[X86_HVM_NR_SPECIAL_PAGES];
xen_pfn_t ioreq_server_array[NR_IOREQ_SERVER_PAGES];
xc_interface *xch = dom->xch;
+ size_t start_info_size = sizeof(struct hvm_start_info);
/* Allocate and clear special pages. */
for ( i = 0; i < X86_HVM_NR_SPECIAL_PAGES; i++ )
@@ -624,8 +628,6 @@ static int alloc_magic_pages_hvm(struct xc_dom_image *dom)
if ( !dom->device_model )
{
- size_t start_info_size = sizeof(struct hvm_start_info);
-
if ( dom->cmdline )
{
dom->cmdline_size = ROUNDUP(strlen(dom->cmdline) + 1, 8);
@@ -635,17 +637,18 @@ static int alloc_magic_pages_hvm(struct xc_dom_image *dom)
/* Limited to one module. */
if ( dom->ramdisk_blob )
start_info_size += sizeof(struct hvm_modlist_entry);
-
- rc = xc_dom_alloc_segment(dom, &dom->start_info_seg,
- "HVMlite start info", 0, start_info_size);
- if ( rc != 0 )
- {
- DOMPRINTF("Unable to reserve memory for the start info");
- goto out;
- }
}
else
{
+ start_info_size +=
+ sizeof(struct hvm_modlist_entry) * HVMLOADER_MODULE_MAX_COUNT;
+ /*
+ * Add extra space to write modules name.
+ * The HVMLOADER_MODULE_NAME_SIZE accounts for NUL byte.
+ */
+ start_info_size +=
+ HVMLOADER_MODULE_NAME_SIZE * HVMLOADER_MODULE_MAX_COUNT;
+
/*
* Allocate and clear additional ioreq server pages. The default
* server will use the IOREQ and BUFIOREQ special pages above.
@@ -672,6 +675,14 @@ static int alloc_magic_pages_hvm(struct xc_dom_image *dom)
NR_IOREQ_SERVER_PAGES);
}
+ rc = xc_dom_alloc_segment(dom, &dom->start_info_seg,
+ "HVMlite start info", 0, start_info_size);
+ if ( rc != 0 )
+ {
+ DOMPRINTF("Unable to reserve memory for the start info");
+ goto out;
+ }
+
/*
* 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.
@@ -1689,42 +1700,89 @@ static int alloc_pgtables_hvm(struct xc_dom_image *dom)
return 0;
}
+/*
+ * The memory layout of the start_info page and the modules, and where the
+ * addresses are stored:
+ *
+ * /----------------------------------\
+ * | struct hvm_start_info |
+ * +----------------------------------+ <- start_info->modlist_paddr
+ * | struct hvm_modlist_entry[0] |
+ * +----------------------------------+
+ * | struct hvm_modlist_entry[1] |
+ * +----------------------------------+ <- modlist[0].cmdline_paddr
+ * | cmdline of module 0 |
+ * | char[HVMLOADER_MODULE_NAME_SIZE] |
+ * +----------------------------------+ <- modlist[1].cmdline_paddr
+ * | cmdline of module 1 |
+ * +----------------------------------+
+ */
+static void add_module_to_list(struct xc_dom_image *dom,
+ struct xc_hvm_firmware_module *module,
+ const char *name,
+ struct hvm_modlist_entry *modlist,
+ struct hvm_start_info *start_info)
+{
+ uint32_t index = start_info->nr_modules;
+ void *modules_cmdline_start = modlist + HVMLOADER_MODULE_MAX_COUNT;
+ uint64_t modlist_paddr = (dom->start_info_seg.pfn << PAGE_SHIFT) +
+ ((uintptr_t)modlist - (uintptr_t)start_info);
+ uint64_t modules_cmdline_paddr = modlist_paddr +
+ sizeof(struct hvm_modlist_entry) * HVMLOADER_MODULE_MAX_COUNT;
+
+ if ( module->length == 0 )
+ return;
+
+ assert(start_info->nr_modules < HVMLOADER_MODULE_MAX_COUNT);
+ assert(strnlen(name, HVMLOADER_MODULE_NAME_SIZE)
+ < HVMLOADER_MODULE_NAME_SIZE);
+
+ modlist[index].paddr = module->guest_addr_out;
+ modlist[index].size = module->length;
+
+ strncpy(modules_cmdline_start + HVMLOADER_MODULE_NAME_SIZE * index,
+ name, HVMLOADER_MODULE_NAME_SIZE);
+ modlist[index].cmdline_paddr =
+ modules_cmdline_paddr + HVMLOADER_MODULE_NAME_SIZE * index;
+
+ start_info->nr_modules++;
+}
+
static int bootlate_hvm(struct xc_dom_image *dom)
{
uint32_t domid = dom->guest_domid;
xc_interface *xch = dom->xch;
+ struct hvm_start_info *start_info;
+ size_t start_info_size;
+ struct hvm_modlist_entry *modlist;
- if ( !dom->device_model )
- {
- struct hvm_start_info *start_info;
- size_t start_info_size;
- void *start_page;
-
- start_info_size = sizeof(*start_info) + dom->cmdline_size;
- if ( dom->ramdisk_blob )
- start_info_size += sizeof(struct hvm_modlist_entry);
+ start_info_size = sizeof(*start_info) + dom->cmdline_size;
+ if ( dom->ramdisk_blob )
+ start_info_size += sizeof(struct hvm_modlist_entry);
- if ( start_info_size >
- dom->start_info_seg.pages << XC_DOM_PAGE_SHIFT(dom) )
- {
- DOMPRINTF("Trying to map beyond start_info_seg");
- return -1;
- }
+ if ( start_info_size >
+ dom->start_info_seg.pages << XC_DOM_PAGE_SHIFT(dom) )
+ {
+ DOMPRINTF("Trying to map beyond start_info_seg");
+ return -1;
+ }
- start_page = xc_map_foreign_range(xch, domid, start_info_size,
- PROT_READ | PROT_WRITE,
- dom->start_info_seg.pfn);
- if ( start_page == NULL )
- {
- DOMPRINTF("Unable to map HVM start info page");
- return -1;
- }
+ start_info = xc_map_foreign_range(xch, domid, start_info_size,
+ PROT_READ | PROT_WRITE,
+ dom->start_info_seg.pfn);
+ if ( start_info == NULL )
+ {
+ DOMPRINTF("Unable to map HVM start info page");
+ return -1;
+ }
- start_info = start_page;
+ modlist = (void*)(start_info + 1) + dom->cmdline_size;
+ if ( !dom->device_model )
+ {
if ( dom->cmdline )
{
- char *cmdline = start_page + sizeof(*start_info);
+ char *cmdline = (void*)(start_info + 1);
strncpy(cmdline, dom->cmdline, dom->cmdline_size);
start_info->cmdline_paddr = (dom->start_info_seg.pfn <<
PAGE_SHIFT) +
@@ -1733,22 +1791,30 @@ static int bootlate_hvm(struct xc_dom_image *dom)
if ( dom->ramdisk_blob )
{
- struct hvm_modlist_entry *modlist =
- start_page + sizeof(*start_info) + dom->cmdline_size;
modlist[0].paddr = dom->ramdisk_seg.vstart - dom->parms.virt_base;
modlist[0].size = dom->ramdisk_seg.vend - dom->ramdisk_seg.vstart;
- start_info->modlist_paddr = (dom->start_info_seg.pfn <<
PAGE_SHIFT) +
- ((uintptr_t)modlist - (uintptr_t)start_info);
start_info->nr_modules = 1;
}
-
- start_info->magic = XEN_HVM_START_MAGIC_VALUE;
-
- munmap(start_page, start_info_size);
}
else
{
+ add_module_to_list(dom, &dom->system_firmware_module, "firmware",
+ modlist, start_info);
+ }
+
+ if ( start_info->nr_modules )
+ {
+ start_info->modlist_paddr = (dom->start_info_seg.pfn << PAGE_SHIFT) +
+ ((uintptr_t)modlist - (uintptr_t)start_info);
+ }
+
+ start_info->magic = XEN_HVM_START_MAGIC_VALUE;
+
+ munmap(start_info, start_info_size);
+
+ if ( dom->device_model )
+ {
void *hvm_info_page;
if ( (hvm_info_page = xc_map_foreign_range(
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index 37bbb22..d9ddee7 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -814,7 +814,7 @@ struct start_info {
typedef struct start_info start_info_t;
/*
- * Start of day structure passed to PVH guests in %ebx.
+ * Start of day structure passed to PVH guests and to HVM guests in %ebx.
*
* NOTE: nothing will be loaded at physical address 0, so a 0 value in any
* of the address fields should be treated as not present.
--
Anthony PERARD
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