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libxc: pass the restore_context through function and allocate the context on the restore function stack.

Browse Source 
Signed-off-by: Vincent Hanquez <vincent.hanquez@eu.citrix.com>
This commit is contained in:
Keir Fraser committed 2009-12-01 13:57:02 +00:00
1 parent 086bbf2057
commit 2ee2c0396c
1 file changed
+32 -30
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tools/libxc/xc_domain_restore.c
+32 -30
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@@ -43,13 +43,6 @@ struct restore_ctx {
struct domain_info_context dinfo;
};
static struct restore_ctx _ctx = {
.live_p2m = NULL,
.p2m = NULL,
.no_superpage_mem = 0,
};
static struct restore_ctx *ctx = &_ctx;
/*
**
**
@@ -69,7 +62,7 @@ static struct restore_ctx *ctx = &_ctx;
#define SUPER_PAGE_TRACKING(pfn) ( (pfn) != INVALID_SUPER_PAGE )
#define SUPER_PAGE_DONE(pfn) ( SUPER_PAGE_START(pfn) )
static int super_page_populated(unsigned long pfn)
static int super_page_populated(struct restore_ctx *ctx, unsigned long pfn)
{
int i;
pfn &= ~(SUPERPAGE_NR_PFNS - 1);
@@ -87,6 +80,7 @@ static int super_page_populated(unsigned long pfn)
*/
static int break_super_page(int xc_handle,
uint32_t dom,
struct restore_ctx *ctx,
xen_pfn_t next_pfn)
{
xen_pfn_t *page_array, start_pfn, mfn;
@@ -200,6 +194,7 @@ out:
*/
static int allocate_mfn_list(int xc_handle,
uint32_t dom,
struct restore_ctx *ctx,
unsigned long nr_extents,
xen_pfn_t *batch_buf,
xen_pfn_t *next_pfn,
@@ -226,7 +221,7 @@ static int allocate_mfn_list(int xc_handle,
!SUPER_PAGE_DONE(sp_pfn))
{
/* break previously allocated super page*/
if ( break_super_page(xc_handle, dom, sp_pfn) != 0 )
if ( break_super_page(xc_handle, dom, ctx, sp_pfn) != 0 )
{
ERROR("Break previous super page fail!\n");
return 1;
@@ -249,7 +244,7 @@ static int allocate_mfn_list(int xc_handle,
goto normal_page;
pfn = batch_buf[0] & ~XEN_DOMCTL_PFINFO_LTAB_MASK;
if ( super_page_populated(pfn) )
if ( super_page_populated(ctx, pfn) )
goto normal_page;
pfn &= ~(SUPERPAGE_NR_PFNS - 1);
@@ -300,6 +295,7 @@ normal_page:
}
static int allocate_physmem(int xc_handle, uint32_t dom,
struct restore_ctx *ctx,
unsigned long *region_pfn_type, int region_size,
unsigned int hvm, xen_pfn_t *region_mfn, int superpages)
{
@@ -341,7 +337,7 @@ static int allocate_physmem(int xc_handle, uint32_t dom,
if ( SUPER_PAGE_START(pfn) )
{
/* Start of a 2M extent, populate previsous buf */
if ( allocate_mfn_list(xc_handle, dom,
if ( allocate_mfn_list(xc_handle, dom, ctx,
batch_buf_len, batch_buf,
&required_pfn, superpages) != 0 )
{
@@ -363,7 +359,7 @@ static int allocate_physmem(int xc_handle, uint32_t dom,
else if ( SUPER_PAGE_TRACKING(required_pfn) )
{
/* break of a 2M extent, populate previous buf */
if ( allocate_mfn_list(xc_handle, dom,
if ( allocate_mfn_list(xc_handle, dom, ctx,
batch_buf_len, batch_buf,
&required_pfn, superpages) != 0 )
{
@@ -404,7 +400,7 @@ static int allocate_physmem(int xc_handle, uint32_t dom,
alloc_page:
if ( batch_buf )
{
if ( allocate_mfn_list(xc_handle, dom,
if ( allocate_mfn_list(xc_handle, dom, ctx,
batch_buf_len, batch_buf,
&required_pfn,
superpages) != 0 )
@@ -497,7 +493,7 @@ static ssize_t read_exact_timed(int fd, void* buf, size_t size)
** This function inverts that operation, replacing the pfn values with
** the (now known) appropriate mfn values.
*/
static int uncanonicalize_pagetable(int xc_handle, uint32_t dom,
static int uncanonicalize_pagetable(int xc_handle, uint32_t dom, struct restore_ctx *ctx,
unsigned long type, void *page, int superpages)
{
int i, pte_last;
@@ -524,7 +520,7 @@ static int uncanonicalize_pagetable(int xc_handle, uint32_t dom,
if ( ctx->p2m[pfn] == INVALID_P2M_ENTRY )
{
unsigned long force_pfn = superpages ? FORCE_SP_MASK : pfn;
if (allocate_mfn_list(xc_handle, dom,
if (allocate_mfn_list(xc_handle, dom, ctx,
1, &pfn, &force_pfn, superpages) != 0)
return 0;
}
@@ -542,7 +538,7 @@ static int uncanonicalize_pagetable(int xc_handle, uint32_t dom,
/* Load the p2m frame list, plus potential extended info chunk */
static xen_pfn_t *load_p2m_frame_list(
static xen_pfn_t *load_p2m_frame_list(struct restore_ctx *ctx,
int io_fd, int *pae_extended_cr3, int *ext_vcpucontext)
{
xen_pfn_t *p2m_frame_list;
@@ -798,7 +794,7 @@ static int dump_qemu(uint32_t dom, struct tailbuf_hvm *buf)
return 0;
}
static int buffer_tail_hvm(struct tailbuf_hvm *buf, int fd,
static int buffer_tail_hvm(struct restore_ctx *ctx, struct tailbuf_hvm *buf, int fd,
unsigned int max_vcpu_id, uint64_t vcpumap,
int ext_vcpucontext)
{
@@ -859,7 +855,7 @@ static int buffer_tail_hvm(struct tailbuf_hvm *buf, int fd,
return -1;
}
static int buffer_tail_pv(struct tailbuf_pv *buf, int fd,
static int buffer_tail_pv(struct restore_ctx *ctx, struct tailbuf_pv *buf, int fd,
unsigned int max_vcpu_id, uint64_t vcpumap,
int ext_vcpucontext)
{
@@ -937,14 +933,14 @@ static int buffer_tail_pv(struct tailbuf_pv *buf, int fd,
return -1;
}
static int buffer_tail(tailbuf_t *buf, int fd, unsigned int max_vcpu_id,
static int buffer_tail(struct restore_ctx *ctx, tailbuf_t *buf, int fd, unsigned int max_vcpu_id,
uint64_t vcpumap, int ext_vcpucontext)
{
if ( buf->ishvm )
return buffer_tail_hvm(&buf->u.hvm, fd, max_vcpu_id, vcpumap,
return buffer_tail_hvm(ctx, &buf->u.hvm, fd, max_vcpu_id, vcpumap,
ext_vcpucontext);
else
return buffer_tail_pv(&buf->u.pv, fd, max_vcpu_id, vcpumap,
return buffer_tail_pv(ctx, &buf->u.pv, fd, max_vcpu_id, vcpumap,
ext_vcpucontext);
}
@@ -1161,8 +1157,8 @@ static int pagebuf_get(pagebuf_t* buf, int fd, int xch, uint32_t dom)
return rc;
}
static int apply_batch(int xc_handle, uint32_t dom, xen_pfn_t* region_mfn,
unsigned long* pfn_type, int pae_extended_cr3,
static int apply_batch(int xc_handle, uint32_t dom, struct restore_ctx *ctx,
xen_pfn_t* region_mfn, unsigned long* pfn_type, int pae_extended_cr3,
unsigned int hvm, struct xc_mmu* mmu,
pagebuf_t* pagebuf, int curbatch, int superpages)
{
@@ -1182,7 +1178,7 @@ static int apply_batch(int xc_handle, uint32_t dom, xen_pfn_t* region_mfn,
if (j > MAX_BATCH_SIZE)
j = MAX_BATCH_SIZE;
if (allocate_physmem(xc_handle, dom, &pagebuf->pfn_types[curbatch],
if (allocate_physmem(xc_handle, dom, ctx, &pagebuf->pfn_types[curbatch],
j, hvm, region_mfn, superpages) != 0)
{
ERROR("allocate_physmem() failed\n");
@@ -1243,7 +1239,7 @@ static int apply_batch(int xc_handle, uint32_t dom, xen_pfn_t* region_mfn,
pae_extended_cr3 ||
(pagetype != XEN_DOMCTL_PFINFO_L1TAB)) {
if (!uncanonicalize_pagetable(xc_handle, dom,
if (!uncanonicalize_pagetable(xc_handle, dom, ctx,
pagetype, page, superpages)) {
/*
** Failing to uncanonicalize a page table can be ok
@@ -1350,6 +1346,12 @@ int xc_domain_restore(int xc_handle, int io_fd, uint32_t dom,
tailbuf_t tailbuf, tmptail;
void* vcpup;
static struct restore_ctx _ctx = {
.live_p2m = NULL,
.p2m = NULL,
.no_superpage_mem = 0,
};
static struct restore_ctx *ctx = &_ctx;
struct domain_info_context *dinfo = &ctx->dinfo;
pagebuf_init(&pagebuf);
@@ -1386,7 +1388,7 @@ int xc_domain_restore(int xc_handle, int io_fd, uint32_t dom,
if ( !hvm )
{
/* Load the p2m frame list, plus potential extended info chunk */
p2m_frame_list = load_p2m_frame_list(
p2m_frame_list = load_p2m_frame_list(ctx,
io_fd, &pae_extended_cr3, &ext_vcpucontext);
if ( !p2m_frame_list )
goto out;
@@ -1500,7 +1502,7 @@ int xc_domain_restore(int xc_handle, int io_fd, uint32_t dom,
while ( curbatch < j ) {
int brc;
brc = apply_batch(xc_handle, dom, region_mfn, pfn_type,
brc = apply_batch(xc_handle, dom, ctx, region_mfn, pfn_type,
pae_extended_cr3, hvm, mmu, &pagebuf, curbatch, superpages);
if ( brc < 0 )
goto out;
@@ -1541,7 +1543,7 @@ int xc_domain_restore(int xc_handle, int io_fd, uint32_t dom,
if ( !completed ) {
int flags = 0;
if ( buffer_tail(&tailbuf, io_fd, max_vcpu_id, vcpumap,
if ( buffer_tail(ctx, &tailbuf, io_fd, max_vcpu_id, vcpumap,
ext_vcpucontext) < 0 ) {
ERROR ("error buffering image tail");
goto out;
@@ -1561,7 +1563,7 @@ int xc_domain_restore(int xc_handle, int io_fd, uint32_t dom,
}
memset(&tmptail, 0, sizeof(tmptail));
tmptail.ishvm = hvm;
if ( buffer_tail(&tmptail, io_fd, max_vcpu_id, vcpumap,
if ( buffer_tail(ctx, &tmptail, io_fd, max_vcpu_id, vcpumap,
ext_vcpucontext) < 0 ) {
ERROR ("error buffering image tail, finishing");
goto finish;
@@ -1664,7 +1666,7 @@ int xc_domain_restore(int xc_handle, int io_fd, uint32_t dom,
for ( k = 0; k < j; k++ )
{
if ( !uncanonicalize_pagetable(
xc_handle, dom, XEN_DOMCTL_PFINFO_L1TAB,
xc_handle, dom, ctx, XEN_DOMCTL_PFINFO_L1TAB,
region_base + k*PAGE_SIZE, superpages) )
{
ERROR("failed uncanonicalize pt!");
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