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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] libxc: Defer initialization of start_page for HVM guests
commit 38a048a3c6f44008a83ac77aecac01a7bce0e7d1
Author: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
AuthorDate: Thu Jan 7 17:19:07 2016 -0500
Commit: Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Tue Jan 19 16:14:32 2016 +0000
libxc: Defer initialization of start_page for HVM guests
With commit 8c45adec18e0 ("libxc: create unmapped initrd in domain
builder if supported") location of ramdisk may not be available to
HVMlite guests by the time alloc_magic_pages_hvm() is invoked if the
guest supports unmapped initrd.
So let's move ramdisk info initialization (along with a few other
operations that are not directly related to allocating magic/special
pages) from alloc_magic_pages_hvm() to bootlate_hvm().
Since we now split allocation and mapping of the start_info segment
let's stash it, along with cmdline length, in xc_dom_image so that we
can check whether we are mapping correctly-sized range.
We can also stop using xc_dom_image.start_info_pfn and leave it for
PV(H) guests only.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Acked-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
tools/libxc/include/xc_dom.h | 2 +
tools/libxc/xc_dom_x86.c | 140 +++++++++++++++++++++++------------------
2 files changed, 80 insertions(+), 62 deletions(-)
diff --git a/tools/libxc/include/xc_dom.h b/tools/libxc/include/xc_dom.h
index 2460818..cac4698 100644
--- a/tools/libxc/include/xc_dom.h
+++ b/tools/libxc/include/xc_dom.h
@@ -71,6 +71,7 @@ struct xc_dom_image {
/* arguments and parameters */
char *cmdline;
+ size_t cmdline_size;
uint32_t f_requested[XENFEAT_NR_SUBMAPS];
/* info from (elf) kernel image */
@@ -91,6 +92,7 @@ struct xc_dom_image {
struct xc_dom_seg p2m_seg;
struct xc_dom_seg pgtables_seg;
struct xc_dom_seg devicetree_seg;
+ struct xc_dom_seg start_info_seg; /* HVMlite only */
xen_pfn_t start_info_pfn;
xen_pfn_t console_pfn;
xen_pfn_t xenstore_pfn;
diff --git a/tools/libxc/xc_dom_x86.c b/tools/libxc/xc_dom_x86.c
index b650762..ef474a8 100644
--- a/tools/libxc/xc_dom_x86.c
+++ b/tools/libxc/xc_dom_x86.c
@@ -586,23 +586,12 @@ static void build_hvm_info(void *hvm_info_page, struct
xc_dom_image *dom)
static int alloc_magic_pages_hvm(struct xc_dom_image *dom)
{
unsigned long i;
- void *hvm_info_page;
uint32_t *ident_pt, domid = dom->guest_domid;
int rc;
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;
- if ( dom->device_model )
- {
- if ( (hvm_info_page = xc_map_foreign_range(
- xch, domid, PAGE_SIZE, PROT_READ | PROT_WRITE,
- HVM_INFO_PFN)) == NULL )
- goto error_out;
- build_hvm_info(hvm_info_page, dom);
- munmap(hvm_info_page, PAGE_SIZE);
- }
-
/* Allocate and clear special pages. */
for ( i = 0; i < X86_HVM_NR_SPECIAL_PAGES; i++ )
special_array[i] = special_pfn(i);
@@ -636,65 +625,25 @@ static int alloc_magic_pages_hvm(struct xc_dom_image *dom)
if ( !dom->device_model )
{
- struct xc_dom_seg seg;
- struct hvm_start_info *start_info;
- char *cmdline;
- struct hvm_modlist_entry *modlist;
- void *start_page;
- size_t cmdline_size = 0;
- size_t start_info_size = sizeof(*start_info);
+ size_t start_info_size = sizeof(struct hvm_start_info);
if ( dom->cmdline )
{
- cmdline_size = ROUNDUP(strlen(dom->cmdline) + 1, 8);
- start_info_size += cmdline_size;
-
+ dom->cmdline_size = ROUNDUP(strlen(dom->cmdline) + 1, 8);
+ start_info_size += dom->cmdline_size;
}
+
+ /* Limited to one module. */
if ( dom->ramdisk_blob )
- start_info_size += sizeof(*modlist); /* Limited to one module. */
+ start_info_size += sizeof(struct hvm_modlist_entry);
- rc = xc_dom_alloc_segment(dom, &seg, "HVMlite start info", 0,
- start_info_size);
+ 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;
}
-
- start_page = xc_map_foreign_range(xch, domid, start_info_size,
- PROT_READ | PROT_WRITE,
- seg.pfn);
- if ( start_page == NULL )
- {
- DOMPRINTF("Unable to map HVM start info page");
- goto error_out;
- }
-
- start_info = start_page;
- cmdline = start_page + sizeof(*start_info);
- modlist = start_page + sizeof(*start_info) + cmdline_size;
-
- if ( dom->cmdline )
- {
- strncpy(cmdline, dom->cmdline, cmdline_size);
- start_info->cmdline_paddr = (seg.pfn << PAGE_SHIFT) +
- ((uintptr_t)cmdline - (uintptr_t)start_info);
- }
-
- if ( dom->ramdisk_blob )
- {
- 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 = (seg.pfn << PAGE_SHIFT) +
- ((uintptr_t)modlist - (uintptr_t)start_info);
- start_info->nr_modules = 1;
- }
-
- start_info->magic = HVM_START_MAGIC_VALUE;
-
- munmap(start_page, start_info_size);
-
- dom->start_info_pfn = seg.pfn;
}
else
{
@@ -1057,8 +1006,8 @@ static int vcpu_hvm(struct xc_dom_image *dom)
/* Set the IP. */
bsp_ctx.cpu.rip = dom->parms.phys_entry;
- if ( dom->start_info_pfn )
- bsp_ctx.cpu.rbx = dom->start_info_pfn << PAGE_SHIFT;
+ if ( dom->start_info_seg.pfn )
+ bsp_ctx.cpu.rbx = dom->start_info_seg.pfn << PAGE_SHIFT;
/* Set the end descriptor. */
bsp_ctx.end_d.typecode = HVM_SAVE_CODE(END);
@@ -1745,7 +1694,74 @@ static int alloc_pgtables_hvm(struct xc_dom_image *dom)
static int bootlate_hvm(struct xc_dom_image *dom)
{
- DOMPRINTF("%s: doing nothing", __func__);
+ uint32_t domid = dom->guest_domid;
+ xc_interface *xch = dom->xch;
+
+ 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);
+
+ 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 = start_page;
+
+ if ( dom->cmdline )
+ {
+ char *cmdline = start_page + sizeof(*start_info);
+
+ strncpy(cmdline, dom->cmdline, dom->cmdline_size);
+ start_info->cmdline_paddr = (dom->start_info_seg.pfn <<
PAGE_SHIFT) +
+ ((uintptr_t)cmdline - (uintptr_t)start_info);
+ }
+
+ 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 = HVM_START_MAGIC_VALUE;
+
+ munmap(start_page, start_info_size);
+ }
+ else
+ {
+ void *hvm_info_page;
+
+ if ( (hvm_info_page = xc_map_foreign_range(
+ xch, domid, PAGE_SIZE, PROT_READ | PROT_WRITE,
+ HVM_INFO_PFN)) == NULL )
+ return -1;
+ build_hvm_info(hvm_info_page, dom);
+ munmap(hvm_info_page, PAGE_SIZE);
+ }
+
return 0;
}
--
generated by git-patchbot for /home/xen/git/xen.git#master
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