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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 6/9] tools/libxc: x86 pv save implementation
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
tools/libxc/saverestore/common.h | 20 ++
tools/libxc/saverestore/save.c | 453 +++++++++++++++++++++++++-
tools/libxc/saverestore/save_x86_pv.c | 568 +++++++++++++++++++++++++++++++++
3 files changed, 1040 insertions(+), 1 deletion(-)
create mode 100644 tools/libxc/saverestore/save_x86_pv.c
diff --git a/tools/libxc/saverestore/common.h b/tools/libxc/saverestore/common.h
index a35eda7..116eb13 100644
--- a/tools/libxc/saverestore/common.h
+++ b/tools/libxc/saverestore/common.h
@@ -12,6 +12,8 @@
#include "../xc_dom.h"
#include "../xc_bitops.h"
+#undef GET_FIELD
+#undef SET_FIELD
#undef mfn_to_pfn
#undef pfn_to_mfn
@@ -121,6 +123,9 @@ struct context
};
};
+/* Saves an x86 PV domain. */
+int save_x86_pv(struct context *ctx);
+
/*
* Write the image and domain headers to the stream.
* (to eventually make static in save.c)
@@ -137,6 +142,21 @@ struct record
void *data;
};
+/* Gets a field from an *_any union */
+#define GET_FIELD(_c, _p, _f) \
+ ({ (_c)->x86_pv.width == 8 ? \
+ (_p)->x64._f: \
+ (_p)->x32._f; \
+ }) \
+
+/* Gets a field from an *_any union */
+#define SET_FIELD(_c, _p, _f, _v) \
+ ({ if ( (_c)->x86_pv.width == 8 ) \
+ (_p)->x64._f = (_v); \
+ else \
+ (_p)->x32._f = (_v); \
+ })
+
/*
* Writes a split record to the stream, applying correct padding where
* appropriate. It is common when sending records containing blobs from Xen
diff --git a/tools/libxc/saverestore/save.c b/tools/libxc/saverestore/save.c
index e842e6c..a19c217 100644
--- a/tools/libxc/saverestore/save.c
+++ b/tools/libxc/saverestore/save.c
@@ -1,3 +1,4 @@
+#include <assert.h>
#include <arpa/inet.h>
#include "common.h"
@@ -42,13 +43,463 @@ int write_headers(struct context *ctx, uint16_t guest_type)
return 0;
}
+static int write_batch(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ xen_pfn_t *mfns = NULL, *types = NULL;
+ void *guest_mapping = NULL;
+ void **guest_data = NULL;
+ void **local_pages = NULL;
+ int *errors = NULL, rc = -1;
+ unsigned i, p, nr_pages = 0;
+ unsigned nr_pfns = ctx->nr_batch_pfns;
+ void *page, *orig_page;
+
+ struct rec_page_data_header hdr;
+ uint32_t rec_type = REC_TYPE_page_data, rec_size, rec_count, rec_res = 0;
+ uint64_t *rec_pfns = NULL;
+ size_t s;
+
+ assert(nr_pfns != 0);
+
+ /* MFNs of the batch pfns */
+ mfns = malloc(nr_pfns * sizeof *mfns);
+ /* Types of the batch pfns */
+ types = malloc(nr_pfns * sizeof *types);
+ /* Errors from attempting to map the mfns */
+ errors = malloc(nr_pfns * sizeof *errors);
+ /* Pointers to page data to send. Might be from mapped mfns or local
allocations */
+ guest_data = calloc(nr_pfns, sizeof *guest_data);
+ /* Pointers to locally allocated pages. Probably not all used, but need
freeing */
+ local_pages = calloc(nr_pfns, sizeof *local_pages);
+
+ if ( !mfns || !types || !errors || !guest_data || !local_pages )
+ {
+ ERROR("Unable to allocate arrays for a batch of %u pages",
+ nr_pfns);
+ goto err;
+ }
+
+ for ( i = 0; i < nr_pfns; ++i )
+ {
+ types[i] = mfns[i] = ctx->ops.pfn_to_gfn(ctx, ctx->batch_pfns[i]);
+
+ /* Likely a ballooned page */
+ if ( mfns[i] == INVALID_MFN )
+ set_bit(ctx->batch_pfns[i], ctx->deferred_pages);
+ }
+
+ rc = xc_get_pfn_type_batch(xch, ctx->domid, nr_pfns, types);
+ if ( rc )
+ {
+ PERROR("Failed to get types for pfn batch");
+ goto err;
+ }
+ rc = -1;
+
+ for ( i = 0; i < nr_pfns; ++i )
+ {
+ switch ( types[i] )
+ {
+ case XEN_DOMCTL_PFINFO_BROKEN:
+ case XEN_DOMCTL_PFINFO_XALLOC:
+ case XEN_DOMCTL_PFINFO_XTAB:
+ continue;
+ }
+
+ mfns[nr_pages++] = mfns[i];
+ }
+
+ if ( nr_pages > 0 )
+ {
+ guest_mapping = xc_map_foreign_bulk(
+ xch, ctx->domid, PROT_READ, mfns, errors, nr_pages);
+ if ( !guest_mapping )
+ {
+ PERROR("Failed to map guest pages");
+ goto err;
+ }
+ }
+
+ for ( i = 0, p = 0; i < nr_pfns; ++i )
+ {
+ switch ( types[i] )
+ {
+ case XEN_DOMCTL_PFINFO_BROKEN:
+ case XEN_DOMCTL_PFINFO_XALLOC:
+ case XEN_DOMCTL_PFINFO_XTAB:
+ continue;
+ }
+
+ if ( errors[p] )
+ {
+ ERROR("Mapping of pfn %#lx (mfn %#lx) failed %d",
+ ctx->batch_pfns[i], mfns[p], errors[p]);
+ goto err;
+ }
+
+ orig_page = page = guest_mapping + (p * PAGE_SIZE);
+ rc = ctx->ops.normalise_page(ctx, types[i], &page);
+ if ( rc )
+ {
+ if ( rc == -1 && errno == EAGAIN )
+ {
+ set_bit(ctx->batch_pfns[i], ctx->deferred_pages);
+ types[i] = XEN_DOMCTL_PFINFO_XTAB;
+ --nr_pages;
+ }
+ else
+ goto err;
+ }
+ else
+ guest_data[i] = page;
+
+ if ( page != orig_page )
+ local_pages[i] = page;
+ rc = -1;
+
+ ++p;
+ }
+
+ hdr.count = nr_pfns;
+ s = nr_pfns * sizeof *rec_pfns;
+
+
+ rec_pfns = malloc(s);
+ if ( !rec_pfns )
+ {
+ ERROR("Unable to allocate memory for page data pfn list");
+ goto err;
+ }
+
+ for ( i = 0; i < nr_pfns; ++i )
+ rec_pfns[i] = ((uint64_t)(types[i]) << 32) | ctx->batch_pfns[i];
+
+ /* header + pfns data + page data */
+ rec_size = 4 + 4 + (s) + (nr_pages * PAGE_SIZE);
+ rec_count = nr_pfns;
+
+ if ( write_exact(ctx->fd, &rec_type, sizeof(uint32_t)) ||
+ write_exact(ctx->fd, &rec_size, sizeof(uint32_t)) ||
+ write_exact(ctx->fd, &rec_count, sizeof(uint32_t)) ||
+ write_exact(ctx->fd, &rec_res, sizeof(uint32_t)) )
+ {
+ PERROR("Failed to write page_type header to stream");
+ goto err;
+ }
+
+ if ( write_exact(ctx->fd, rec_pfns, s) )
+ {
+ PERROR("Failed to write page_type header to stream");
+ goto err;
+ }
+
+
+ for ( i = 0; i < nr_pfns; ++i )
+ if ( guest_data[i] )
+ {
+ if ( write_exact(ctx->fd, guest_data[i], PAGE_SIZE) )
+ {
+ PERROR("Failed to write page into stream");
+ goto err;
+ }
+
+ --nr_pages;
+ }
+
+ /* Sanity check */
+ assert(nr_pages == 0);
+ ctx->nr_batch_pfns = 0;
+ rc = 0;
+
+ err:
+ free(rec_pfns);
+ if ( guest_mapping )
+ munmap(guest_mapping, nr_pages * PAGE_SIZE);
+ for ( i = 0; local_pages && i < nr_pfns; ++i )
+ free(local_pages[i]);
+ free(local_pages);
+ free(guest_data);
+ free(errors);
+ free(types);
+ free(mfns);
+
+ return rc;
+}
+
+static int flush_batch(struct context *ctx)
+{
+ int rc = 0;
+
+ if ( ctx->nr_batch_pfns == 0 )
+ return rc;
+
+ rc = write_batch(ctx);
+
+ if ( !rc )
+ {
+ /* Valgrind sanity check */
+ free(ctx->batch_pfns);
+ ctx->batch_pfns = malloc(MAX_BATCH_SIZE * sizeof *ctx->batch_pfns);
+ rc = !ctx->batch_pfns;
+ }
+
+ return rc;
+}
+
+static int add_to_batch(struct context *ctx, xen_pfn_t pfn)
+{
+ int rc = 0;
+
+ if ( ctx->nr_batch_pfns == MAX_BATCH_SIZE )
+ rc = flush_batch(ctx);
+
+ if ( rc == 0 )
+ ctx->batch_pfns[ctx->nr_batch_pfns++] = pfn;
+
+ return rc;
+}
+
+static int write_page_data_live(struct context *ctx,
+ xc_hypercall_buffer_t *to_send_hbuf,
+ xc_shadow_op_stats_t *shadow_stats)
+{
+ xc_interface *xch = ctx->xch;
+ DECLARE_HYPERCALL_BUFFER_SHADOW(unsigned long, to_send, to_send_hbuf);
+ unsigned pages_written;
+ unsigned x, max_iter = 5, dirty_threshold = 50;
+ xen_pfn_t p;
+ int rc = -1;
+
+ if ( xc_shadow_control(xch, ctx->domid,
+ XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY,
+ NULL, 0, NULL, 0, NULL) < 0 )
+ {
+ PERROR("Failed to enable logdirty");
+ goto out;
+ }
+
+ for ( x = 0, pages_written = 0; x < max_iter ; ++x )
+ {
+ DPRINTF("Iteration %u", x);
+
+ for ( p = 0 ; p < ctx->save.p2m_size; ++p )
+ {
+ if ( test_bit(p, to_send) )
+ {
+ rc = add_to_batch(ctx, p);
+ if ( rc )
+ {
+ ERROR("Fatal write error :s");
+ goto out;
+ }
+
+ ++pages_written;
+ }
+ }
+
+ rc = flush_batch(ctx);
+ if ( rc )
+ {
+ ERROR("Fatal write error :s");
+ goto out;
+ }
+ rc = -1;
+
+ if ( xc_shadow_control(
+ xch, ctx->domid, XEN_DOMCTL_SHADOW_OP_CLEAN,
+ HYPERCALL_BUFFER(to_send), ctx->save.p2m_size,
+ NULL, 0, shadow_stats) != ctx->save.p2m_size )
+ {
+ PERROR("Failed to retrieve logdirty bitmap");
+ goto out;
+ }
+ else
+ {
+ DPRINTF(" Wrote %u pages; stats: faults %"PRIu32", dirty %"PRIu32,
+ pages_written, shadow_stats->fault_count,
+ shadow_stats->dirty_count);
+ }
+
+ if ( shadow_stats->dirty_count < dirty_threshold )
+ break;
+
+ pages_written = 0;
+ }
+ rc = 0;
+
+out:
+ return rc;
+}
+
+
+static int pause_domain(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ int rc;
+
+ if ( !ctx->dominfo.paused )
+ {
+ rc = (ctx->save.callbacks->suspend(ctx->save.callbacks->data) != 1);
+ if ( rc )
+ {
+ ERROR("Failed to suspend domain");
+ return rc;
+ }
+ }
+
+ IPRINTF("Domain now paused");
+
+ return 0;
+}
+
+static int write_page_data_paused(struct context *ctx,
+ xc_hypercall_buffer_t *to_send_hbuf,
+ xc_shadow_op_stats_t *shadow_stats)
+{
+ xc_interface *xch = ctx->xch;
+ DECLARE_HYPERCALL_BUFFER_SHADOW(unsigned long, to_send, to_send_hbuf);
+ xen_pfn_t p;
+ unsigned int pages_written;
+ int rc = -1;
+
+ if ( xc_shadow_control(
+ xch, ctx->domid, XEN_DOMCTL_SHADOW_OP_CLEAN,
+ HYPERCALL_BUFFER(to_send), ctx->save.p2m_size,
+ NULL, 0, shadow_stats) != ctx->save.p2m_size )
+ {
+ PERROR("Failed to retrieve logdirty bitmap");
+ goto err;
+ }
+
+ /*
+ * Domain must be paused from this point onwards.
+ */
+
+ for ( p = 0, pages_written = 0 ; p < ctx->save.p2m_size; ++p )
+ {
+ if ( test_bit(p, to_send) || test_bit(p, ctx->deferred_pages) )
+ {
+ if ( add_to_batch(ctx, p) )
+ {
+ PERROR("Fatal error for pfn %lx", p);
+ goto err;
+ }
+ ++pages_written;
+ }
+ }
+ DPRINTF(" Wrote %u pages", pages_written);
+
+ rc = flush_batch(ctx);
+ if ( rc )
+ {
+ ERROR("Fatal write error :s");
+ goto err;
+ }
+
+ err:
+ return rc;
+}
+
+int write_page_data_and_pause(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ DECLARE_HYPERCALL_BUFFER(unsigned long, to_send);
+ xc_shadow_op_stats_t shadow_stats;
+ int rc;
+
+ ctx->batch_pfns = malloc(MAX_BATCH_SIZE * sizeof *ctx->batch_pfns);
+ if ( !ctx->batch_pfns )
+ {
+ ERROR("Unable to allocate memory for page batch list");
+ rc = -1;
+ goto out;
+ }
+
+ to_send = xc_hypercall_buffer_alloc_pages(
+ xch, to_send, NRPAGES(bitmap_size(ctx->save.p2m_size)));
+ ctx->deferred_pages = calloc(1, bitmap_size(ctx->save.p2m_size));
+
+ if ( !to_send || !ctx->deferred_pages )
+ {
+ ERROR("Unable to allocate memory for to_{send,fix} bitmaps");
+ rc = -1;
+ goto out;
+ }
+
+ memset(to_send, 0xff, bitmap_size(ctx->save.p2m_size));
+
+ rc = write_page_data_live(ctx, HYPERCALL_BUFFER(to_send), &shadow_stats);
+ if ( rc )
+ goto out;
+
+ rc = pause_domain(ctx);
+ if ( rc )
+ goto out;
+
+ rc = write_page_data_paused(ctx, HYPERCALL_BUFFER(to_send), &shadow_stats);
+ if ( rc )
+ goto out;
+
+ rc = 0;
+
+ out:
+ xc_hypercall_buffer_free_pages(xch, to_send,
+ NRPAGES(bitmap_size(ctx->save.p2m_size)));
+ free(ctx->deferred_pages);
+ free(ctx->batch_pfns);
+ return rc;
+}
+
int xc_domain_save2(xc_interface *xch, int io_fd, uint32_t dom, uint32_t
max_iters,
uint32_t max_factor, uint32_t flags,
struct save_callbacks* callbacks, int hvm,
unsigned long vm_generationid_addr)
{
+ struct context ctx =
+ {
+ .xch = xch,
+ .fd = io_fd,
+ };
+
+ /* Older GCC cant initialise anonymous unions */
+ ctx.save.callbacks = callbacks;
+
IPRINTF("In experimental %s", __func__);
- return -1;
+
+ if ( xc_domain_getinfo(xch, dom, 1, &ctx.dominfo) != 1 )
+ {
+ PERROR("Failed to get domain info");
+ return -1;
+ }
+
+ if ( ctx.dominfo.domid != dom )
+ {
+ ERROR("Domain %d does not exist", dom);
+ return -1;
+ }
+
+ ctx.domid = dom;
+ IPRINTF("Saving domain %d", dom);
+
+ ctx.save.p2m_size = xc_domain_maximum_gpfn(xch, dom) + 1;
+ if ( ctx.save.p2m_size > ~XEN_DOMCTL_PFINFO_LTAB_MASK )
+ {
+ errno = E2BIG;
+ ERROR("Cannot save this big a guest");
+ return -1;
+ }
+
+ if ( ctx.dominfo.hvm )
+ {
+ ERROR("HVM Save not supported yet");
+ return -1;
+ }
+ else
+ {
+ ctx.ops = save_restore_ops_x86_pv;
+ return save_x86_pv(&ctx);
+ }
}
/*
diff --git a/tools/libxc/saverestore/save_x86_pv.c
b/tools/libxc/saverestore/save_x86_pv.c
new file mode 100644
index 0000000..c82f7f0
--- /dev/null
+++ b/tools/libxc/saverestore/save_x86_pv.c
@@ -0,0 +1,568 @@
+#include <assert.h>
+
+#include "common_x86_pv.h"
+
+static int map_shinfo(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+
+ ctx->x86_pv.shinfo = xc_map_foreign_range(
+ xch, ctx->domid, PAGE_SIZE, PROT_READ, ctx->dominfo.shared_info_frame);
+ if ( !ctx->x86_pv.shinfo )
+ {
+ PERROR("Failed to map shared info frame at pfn %#lx",
+ ctx->dominfo.shared_info_frame);
+ return -1;
+ }
+
+ return 0;
+}
+
+static void copy_pfns_from_guest(struct context *ctx, xen_pfn_t *dst,
+ void *src, size_t count)
+{
+ size_t x;
+
+ if ( ctx->x86_pv.width == sizeof(unsigned long) )
+ memcpy(dst, src, count * sizeof *dst);
+ else
+ {
+ for ( x = 0; x < count; ++x )
+ {
+#ifdef __x86_64__
+ /* 64bit toolstack, 32bit guest. Expand any INVALID_MFN. */
+ uint32_t s = ((uint32_t *)src)[x];
+
+ dst[x] = s == ~0U ? INVALID_MFN : s;
+#else
+ /* 32bit toolstack, 64bit guest. Truncate their pointers */
+ dst[x] = ((uint64_t *)src)[x];
+#endif
+ }
+ }
+}
+
+static int map_p2m(struct context *ctx)
+{
+ /* Terminology:
+ *
+ * fll - frame list list, top level p2m, list of fl mfns
+ * fl - frame list, mid level p2m, list of leaf mfns
+ * local - own allocated buffers, adjusted for bitness
+ * guest - mappings into the domain
+ */
+ xc_interface *xch = ctx->xch;
+ int rc = -1;
+ unsigned tries = 100, x, fpp, fll_entries, fl_entries;
+ xen_pfn_t fll_mfn;
+
+ xen_pfn_t *local_fll = NULL;
+ void *guest_fll = NULL;
+ size_t local_fll_size;
+
+ xen_pfn_t *local_fl = NULL;
+ void *guest_fl = NULL;
+ size_t local_fl_size;
+
+ fpp = ctx->x86_pv.fpp = PAGE_SIZE / ctx->x86_pv.width;
+ fll_entries = (ctx->x86_pv.max_pfn / (fpp * fpp)) + 1;
+ fl_entries = (ctx->x86_pv.max_pfn / fpp) + 1;
+
+ fll_mfn = GET_FIELD(ctx, ctx->x86_pv.shinfo,
arch.pfn_to_mfn_frame_list_list);
+ if ( !fll_mfn )
+ IPRINTF("Waiting for domain to set up its p2m frame list list");
+
+ while ( tries-- && !fll_mfn )
+ {
+ usleep(10000);
+ fll_mfn = GET_FIELD(ctx, ctx->x86_pv.shinfo,
+ arch.pfn_to_mfn_frame_list_list);
+ }
+
+ if ( !fll_mfn )
+ {
+ ERROR("Timed out waiting for p2m frame list list to be updated");
+ goto err;
+ }
+
+ /* Map the guest top p2m */
+ guest_fll = xc_map_foreign_range(xch, ctx->domid, PAGE_SIZE,
+ PROT_READ, fll_mfn);
+ if ( !guest_fll )
+ {
+ PERROR("Failed to map p2m frame list list at %#lx", fll_mfn);
+ goto err;
+ }
+
+ local_fll_size = fll_entries * sizeof *local_fll;
+ local_fll = malloc(local_fll_size);
+ if ( !local_fll )
+ {
+ ERROR("Cannot allocate %zu bytes for local p2m frame list list",
+ local_fll_size);
+ goto err;
+ }
+
+ copy_pfns_from_guest(ctx, local_fll, guest_fll, fll_entries);
+
+ /* Map the guest mid p2m frames */
+ guest_fl = xc_map_foreign_pages(xch, ctx->domid, PROT_READ,
+ local_fll, fll_entries);
+ if ( !guest_fl )
+ {
+ PERROR("Failed to map p2m frame list");
+ goto err;
+ }
+
+ local_fl_size = fl_entries * sizeof *local_fl;
+ local_fl = malloc(local_fl_size);
+ if ( !local_fl )
+ {
+ ERROR("Cannot allocate %zu bytes for local p2m frame list",
+ local_fl_size);
+ goto err;
+ }
+
+ copy_pfns_from_guest(ctx, local_fl, guest_fl, fl_entries);
+
+ /* Map the p2m leaves themselves */
+ ctx->x86_pv.p2m = xc_map_foreign_pages(xch, ctx->domid, PROT_READ,
+ local_fl, fl_entries);
+ if ( !ctx->x86_pv.p2m )
+ {
+ PERROR("Failed to map p2m frames");
+ goto err;
+ }
+
+ ctx->x86_pv.p2m_frames = fl_entries;
+ ctx->x86_pv.p2m_pfns = malloc(local_fl_size);
+ if ( !ctx->x86_pv.p2m_pfns )
+ {
+ ERROR("Cannot allocate %zu bytes for p2m pfns list",
+ local_fl_size);
+ goto err;
+ }
+
+ /* Convert leaf frames from mfns to pfns */
+ for ( x = 0; x < fl_entries; ++x )
+ if ( !mfn_in_pseudophysmap(ctx, local_fl[x]) )
+ {
+ ERROR("Bad MFN in p2m_frame_list[%u]", x);
+ pseudophysmap_walk(ctx, local_fl[x]);
+ errno = ERANGE;
+ goto err;
+ }
+ else
+ ctx->x86_pv.p2m_pfns[x] = mfn_to_pfn(ctx, local_fl[x]);
+
+ rc = 0;
+err:
+
+ free(local_fl);
+ if ( guest_fl )
+ munmap(guest_fl, fll_entries * PAGE_SIZE);
+
+ free(local_fll);
+ if ( guest_fll )
+ munmap(guest_fll, PAGE_SIZE);
+
+ return rc;
+}
+
+static int write_one_vcpu_basic(struct context *ctx, uint32_t id)
+{
+ xc_interface *xch = ctx->xch;
+ xen_pfn_t mfn, pfn;
+ unsigned i;
+ int rc = -1;
+ vcpu_guest_context_any_t vcpu;
+ struct rec_x86_pv_vcpu vhdr = { .vcpu_id = id };
+ struct record rec =
+ {
+ .type = REC_TYPE_x86_pv_vcpu_basic,
+ .length = sizeof vhdr,
+ .data = &vhdr,
+ };
+
+ if ( xc_vcpu_getcontext(xch, ctx->domid, id, &vcpu) )
+ {
+ PERROR("Failed to get vcpu%u context", id);
+ goto err;
+ }
+
+ /* Vcpu 0 is special: Convert the suspend record to a PFN */
+ if ( id == 0 )
+ {
+ mfn = GET_FIELD(ctx, &vcpu, user_regs.edx);
+ if ( !mfn_in_pseudophysmap(ctx, mfn) )
+ {
+ ERROR("Bad MFN for suspend record");
+ pseudophysmap_walk(ctx, mfn);
+ errno = ERANGE;
+ goto err;
+ }
+ SET_FIELD(ctx, &vcpu, user_regs.edx, mfn_to_pfn(ctx, mfn));
+ }
+
+ /* Convert GDT frames to PFNs */
+ for ( i = 0; (i * 512) < GET_FIELD(ctx, &vcpu, gdt_ents); ++i )
+ {
+ mfn = GET_FIELD(ctx, &vcpu, gdt_frames[i]);
+ if ( !mfn_in_pseudophysmap(ctx, mfn) )
+ {
+ ERROR("Bad MFN for frame %u of vcpu%u's GDT", i, id);
+ pseudophysmap_walk(ctx, mfn);
+ errno = ERANGE;
+ goto err;
+ }
+ SET_FIELD(ctx, &vcpu, gdt_frames[i], mfn_to_pfn(ctx, mfn));
+ }
+
+ /* Convert CR3 to a PFN */
+ mfn = cr3_to_mfn(ctx, GET_FIELD(ctx, &vcpu, ctrlreg[3]));
+ if ( !mfn_in_pseudophysmap(ctx, mfn) )
+ {
+ ERROR("Bad MFN for vcpu%u's cr3", id);
+ pseudophysmap_walk(ctx, mfn);
+ errno = ERANGE;
+ goto err;
+ }
+ pfn = mfn_to_pfn(ctx, mfn);
+ SET_FIELD(ctx, &vcpu, ctrlreg[3], mfn_to_cr3(ctx, pfn));
+
+ /* 64bit guests: Convert CR1 (guest pagetables) to PFN */
+ if ( ctx->x86_pv.levels == 4 && vcpu.x64.ctrlreg[1] )
+ {
+ mfn = vcpu.x64.ctrlreg[1] >> PAGE_SHIFT;
+ if ( !mfn_in_pseudophysmap(ctx, mfn) )
+ {
+ ERROR("Bad MFN for vcpu%u's cr1", id);
+ pseudophysmap_walk(ctx, mfn);
+ errno = ERANGE;
+ goto err;
+ }
+
+ pfn = mfn_to_pfn(ctx, mfn);
+ vcpu.x64.ctrlreg[1] = 1 | ((uint64_t)pfn << PAGE_SHIFT);
+ }
+
+ if ( ctx->x86_pv.width == 8 )
+ rc = write_split_record(ctx, &rec, &vcpu, sizeof vcpu.x64);
+ else
+ rc = write_split_record(ctx, &rec, &vcpu, sizeof vcpu.x32);
+
+ if ( rc )
+ goto err;
+
+ DPRINTF("Writing vcpu%u basic context", id);
+ rc = 0;
+ err:
+
+ return rc;
+}
+
+static int write_one_vcpu_extended(struct context *ctx, uint32_t id)
+{
+ xc_interface *xch = ctx->xch;
+ int rc;
+ struct rec_x86_pv_vcpu vhdr = { .vcpu_id = id };
+ struct record rec =
+ {
+ .type = REC_TYPE_x86_pv_vcpu_extended,
+ .length = sizeof vhdr,
+ .data = &vhdr,
+ };
+ struct xen_domctl domctl =
+ {
+ .cmd = XEN_DOMCTL_get_ext_vcpucontext,
+ .domain = ctx->domid,
+ .u.ext_vcpucontext.vcpu = id,
+ };
+
+ if ( xc_domctl(xch, &domctl) < 0 )
+ {
+ PERROR("Unable to get vcpu%u extended context", id);
+ return -1;
+ }
+
+ rc = write_split_record(ctx, &rec, &domctl.u.ext_vcpucontext,
+ domctl.u.ext_vcpucontext.size);
+ if ( rc )
+ return rc;
+
+ DPRINTF("Writing vcpu%u extended context", id);
+
+ return 0;
+}
+
+static int write_one_vcpu_xsave(struct context *ctx, uint32_t id)
+{
+ xc_interface *xch = ctx->xch;
+ int rc = -1;
+ DECLARE_HYPERCALL_BUFFER(void, buffer);
+ struct rec_x86_pv_vcpu_xsave vhdr = { .vcpu_id = id };
+ struct record rec =
+ {
+ .type = REC_TYPE_x86_pv_vcpu_xsave,
+ .length = sizeof vhdr,
+ .data = &vhdr,
+ };
+ struct xen_domctl domctl =
+ {
+ .cmd = XEN_DOMCTL_getvcpuextstate,
+ .domain = ctx->domid,
+ .u.vcpuextstate.vcpu = id,
+ };
+
+ if ( xc_domctl(xch, &domctl) < 0 )
+ {
+ PERROR("Unable to get vcpu%u's xsave context", id);
+ goto err;
+ }
+
+ if ( !domctl.u.vcpuextstate.xfeature_mask )
+ {
+ DPRINTF("vcpu%u has no xsave context - skipping", id);
+ goto out;
+ }
+
+ buffer = xc_hypercall_buffer_alloc(xch, buffer,
domctl.u.vcpuextstate.size);
+ if ( !buffer )
+ {
+ ERROR("Unable to allocate %"PRIx64" bytes for vcpu%u's xsave context",
+ domctl.u.vcpuextstate.size, id);
+ goto err;
+ }
+
+ set_xen_guest_handle(domctl.u.vcpuextstate.buffer, buffer);
+ if ( xc_domctl(xch, &domctl) < 0 )
+ {
+ PERROR("Unable to get vcpu%u's xsave context", id);
+ goto err;
+ }
+
+ vhdr.xfeature_mask = domctl.u.vcpuextstate.xfeature_mask;
+
+ rc = write_split_record(ctx, &rec, buffer, domctl.u.vcpuextstate.size);
+ if ( rc )
+ goto err;
+
+ DPRINTF("Writing vcpu%u xsave context", id);
+
+ out:
+ rc = 0;
+
+ err:
+ xc_hypercall_buffer_free(xch, buffer);
+
+ return rc;
+}
+
+static int write_all_vcpu_information(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ xc_vcpuinfo_t vinfo;
+ unsigned int i;
+ int rc;
+
+ for ( i = 0; i <= ctx->dominfo.max_vcpu_id; ++i )
+ {
+ rc = xc_vcpu_getinfo(xch, ctx->domid, i, &vinfo);
+ if ( rc )
+ {
+ PERROR("Failed to get vcpu%u information", i);
+ return rc;
+ }
+
+ if ( !vinfo.online )
+ {
+ DPRINTF("vcpu%u offline - skipping", i);
+ continue;
+ }
+
+ rc = write_one_vcpu_basic(ctx, i) ?:
+ write_one_vcpu_extended(ctx, i) ?:
+ write_one_vcpu_xsave(ctx, i);
+ if ( rc )
+ return rc;
+ };
+
+ return 0;
+}
+
+static int write_x86_pv_info(struct context *ctx)
+{
+ struct rec_x86_pv_info info =
+ {
+ .guest_width = ctx->x86_pv.width,
+ .pt_levels = ctx->x86_pv.levels,
+ };
+ struct record rec =
+ {
+ .type = REC_TYPE_x86_pv_info,
+ .length = sizeof info,
+ .data = &info
+ };
+
+ return write_record(ctx, &rec);
+}
+
+static int write_x86_pv_p2m_frames(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ int rc; unsigned i;
+ size_t datasz = ctx->x86_pv.p2m_frames * sizeof(uint64_t);
+ uint64_t *data = NULL;
+ struct rec_x86_pv_p2m_frames hdr =
+ {
+ .start_pfn = 0,
+ .end_pfn = ctx->x86_pv.max_pfn,
+ };
+ struct record rec =
+ {
+ .type = REC_TYPE_x86_pv_p2m_frames,
+ .length = sizeof hdr,
+ .data = &hdr,
+ };
+
+ /* No need to translate if sizeof(uint64_t) == sizeof(xen_pfn_t) */
+ if ( sizeof(uint64_t) != sizeof(*ctx->x86_pv.p2m_pfns) )
+ {
+ if ( !(data = malloc(datasz)) )
+ {
+ ERROR("Cannot allocate %zu bytes for X86_PV_P2M_FRAMES data",
datasz);
+ return -1;
+ }
+
+ for ( i = 0; i < ctx->x86_pv.p2m_frames; ++i )
+ data[i] = ctx->x86_pv.p2m_pfns[i];
+ }
+ else
+ data = (uint64_t *)ctx->x86_pv.p2m_pfns;
+
+ rc = write_split_record(ctx, &rec, data, datasz);
+
+ if ( data != (uint64_t *)ctx->x86_pv.p2m_pfns )
+ free(data);
+
+ return rc;
+}
+
+static int write_shared_info(struct context *ctx)
+{
+ struct record rec =
+ {
+ .type = REC_TYPE_shared_info,
+ .length = PAGE_SIZE,
+ .data = ctx->x86_pv.shinfo,
+ };
+
+ return write_record(ctx, &rec);
+}
+
+int save_x86_pv(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ int rc;
+ struct record end = { REC_TYPE_end, 0, NULL };
+
+ IPRINTF("In experimental %s", __func__);
+
+ /* Write Image and Domain headers to the stream */
+ rc = write_headers(ctx, DHDR_TYPE_x86_pv);
+ if ( rc )
+ goto err;
+
+ /* Query some properties, and stash in the save context */
+ rc = x86_pv_domain_info(ctx);
+ if ( rc )
+ goto err;
+
+ /* Write an X86_PV_INFO record into the stream */
+ rc = write_x86_pv_info(ctx);
+ if ( rc )
+ goto err;
+
+ /* Map various structures */
+ rc = x86_pv_map_m2p(ctx) ?: map_shinfo(ctx) ?: map_p2m(ctx);
+ if ( rc )
+ goto err;
+
+ /* Write a full X86_PV_P2M_FRAMES record into the stream */
+ rc = write_x86_pv_p2m_frames(ctx);
+ if ( rc )
+ goto err;
+
+ rc = write_page_data_and_pause(ctx);
+ if ( rc )
+ goto err;
+
+ rc = write_tsc_info(ctx);
+ if ( rc )
+ goto err;
+
+ rc = write_shared_info(ctx);
+ if ( rc )
+ goto err;
+
+ /* Refresh domain information now it has paused */
+ if ( (xc_domain_getinfo(xch, ctx->domid, 1, &ctx->dominfo) != 1) ||
+ (ctx->dominfo.domid != ctx->domid) )
+ {
+ PERROR("Unable to refresh domain information");
+ rc = -1;
+ goto err;
+ }
+ else if ( (!ctx->dominfo.shutdown ||
+ ctx->dominfo.shutdown_reason != SHUTDOWN_suspend ) &&
+ !ctx->dominfo.paused )
+ {
+ ERROR("Domain has not been suspended");
+ rc = -1;
+ goto err;
+ }
+
+ /* Write all the vcpu information */
+ rc = write_all_vcpu_information(ctx);
+ if ( rc )
+ goto err;
+
+ /* Write an END record */
+ rc = write_record(ctx, &end);
+ if ( rc )
+ goto err;
+
+ /* all done */
+ assert(!rc);
+ goto cleanup;
+
+ err:
+ assert(rc);
+ cleanup:
+
+ xc_shadow_control(xch, ctx->domid, XEN_DOMCTL_SHADOW_OP_OFF,
+ NULL, 0, NULL, 0, NULL);
+
+ free(ctx->x86_pv.p2m_pfns);
+
+ if ( ctx->x86_pv.p2m )
+ munmap(ctx->x86_pv.p2m, ctx->x86_pv.p2m_frames * PAGE_SIZE);
+
+ if ( ctx->x86_pv.shinfo )
+ munmap(ctx->x86_pv.shinfo, PAGE_SIZE);
+
+ if ( ctx->x86_pv.m2p )
+ munmap(ctx->x86_pv.m2p, ctx->x86_pv.nr_m2p_frames * PAGE_SIZE);
+
+ return rc;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
1.7.10.4
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