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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v5 RFC 12/14] tools/libxc: x86 HVM restore code
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 | 1 +
tools/libxc/saverestore/restore_x86_hvm.c | 280 +++++++++++++++++++++++++++++
2 files changed, 281 insertions(+)
create mode 100644 tools/libxc/saverestore/restore_x86_hvm.c
diff --git a/tools/libxc/saverestore/common.h b/tools/libxc/saverestore/common.h
index 9e70ed6..e16e0de 100644
--- a/tools/libxc/saverestore/common.h
+++ b/tools/libxc/saverestore/common.h
@@ -251,6 +251,7 @@ extern struct save_ops save_ops_x86_pv;
extern struct save_ops save_ops_x86_hvm;
extern struct restore_ops restore_ops_x86_pv;
+extern struct restore_ops restore_ops_x86_hvm;
struct record
{
diff --git a/tools/libxc/saverestore/restore_x86_hvm.c
b/tools/libxc/saverestore/restore_x86_hvm.c
new file mode 100644
index 0000000..299d77f
--- /dev/null
+++ b/tools/libxc/saverestore/restore_x86_hvm.c
@@ -0,0 +1,280 @@
+#include <assert.h>
+
+#include "common_x86.h"
+
+/* TODO: remove */
+static int handle_toolstack(struct context *ctx, struct record *rec)
+{
+ xc_interface *xch = ctx->xch;
+ int rc;
+
+ if ( !ctx->restore.callbacks || !ctx->restore.callbacks->toolstack_restore
)
+ return 0;
+
+ rc = ctx->restore.callbacks->toolstack_restore(ctx->domid, rec->data,
rec->length,
+
ctx->restore.callbacks->data);
+ if ( rc < 0 )
+ PERROR("restoring toolstack");
+ return rc;
+}
+
+/*
+ * Process an HVM_CONTEXT record from the stream.
+ */
+static int handle_hvm_context(struct context *ctx, struct record *rec)
+{
+ xc_interface *xch = ctx->xch;
+ int rc;
+
+ rc = xc_domain_hvm_setcontext(xch, ctx->domid, rec->data, rec->length);
+ if ( rc < 0 )
+ PERROR("Unable to restore HVM context");
+ return rc;
+}
+
+/*
+ * Process an HVM_PARAMS record from the stream.
+ */
+static int handle_hvm_params(struct context *ctx, struct record *rec)
+{
+ xc_interface *xch = ctx->xch;
+ struct rec_hvm_params *hdr = rec->data;
+ struct rec_hvm_params_entry *entry = hdr->param;
+ unsigned int i;
+ int rc;
+
+ if ( rec->length < sizeof(*hdr)
+ || rec->length < sizeof(*hdr) + hdr->count * sizeof(*entry) )
+ {
+ ERROR("hvm_params record is too short");
+ return -1;
+ }
+
+ for ( i = 0; i < hdr->count; i++, entry++ )
+ {
+ switch ( entry->index )
+ {
+ case HVM_PARAM_CONSOLE_PFN:
+ ctx->restore.console_mfn = entry->value;
+ xc_clear_domain_page(xch, ctx->domid, entry->value);
+ break;
+ case HVM_PARAM_STORE_PFN:
+ ctx->restore.xenstore_mfn = entry->value;
+ xc_clear_domain_page(xch, ctx->domid, entry->value);
+ break;
+ case HVM_PARAM_IOREQ_PFN:
+ case HVM_PARAM_BUFIOREQ_PFN:
+ xc_clear_domain_page(xch, ctx->domid, entry->value);
+ break;
+ }
+
+ rc = xc_set_hvm_param(xch, ctx->domid, entry->index, entry->value);
+ if ( rc < 0 )
+ {
+ PERROR("set HVM param %"PRId64" = 0x%016"PRIx64,
+ entry->index, entry->value);
+ return rc;
+ }
+ }
+ return 0;
+}
+
+/* TODO: remove */
+static int dump_qemu(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ char qemusig[21], path[256];
+ uint32_t qlen;
+ void *qbuf = NULL;
+ int rc = -1;
+ FILE *fp = NULL;
+
+ if ( read_exact(ctx->fd, qemusig, sizeof(qemusig)) )
+ {
+ PERROR("Error reading QEMU signature");
+ goto out;
+ }
+
+ if ( memcmp(qemusig, "DeviceModelRecord0002", sizeof(qemusig)) )
+ {
+ qemusig[20] = '\0';
+ ERROR("Invalid device model state signature %s", qemusig);
+ goto out;
+ }
+
+ if ( read_exact(ctx->fd, &qlen, sizeof(qlen)) )
+ {
+ PERROR("Error reading QEMU record length");
+ goto out;
+ }
+
+ qbuf = malloc(qlen);
+ if ( !qbuf )
+ {
+ PERROR("no memory for device model state");
+ goto out;
+ }
+
+ if ( read_exact(ctx->fd, qbuf, qlen) )
+ {
+ PERROR("Error reading device model state");
+ goto out;
+ }
+
+ sprintf(path, XC_DEVICE_MODEL_RESTORE_FILE".%u", ctx->domid);
+ fp = fopen(path, "wb");
+ if ( !fp )
+ {
+ PERROR("Failed to open '%s' for writing", path);
+ goto out;
+ }
+
+ DPRINTF("Writing %u bytes of QEMU data", qlen);
+ if ( fwrite(qbuf, 1, qlen, fp) != qlen )
+ {
+ PERROR("Failed to write %u bytes of QEMU data", qlen);
+ goto out;
+ }
+
+ rc = 0;
+
+ out:
+ if ( fp )
+ fclose(fp);
+ free(qbuf);
+
+ return rc;
+}
+
+/*
+ * restore_ops function.
+ */
+static int x86_hvm_localise_page(struct context *ctx, uint32_t type, void
*page)
+{
+ /* no-op */
+ return 0;
+}
+
+/*
+ * restore_ops function. Confirms the stream matches the domain.
+ */
+static int x86_hvm_setup(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+
+ if ( ctx->restore.guest_type != DHDR_TYPE_X86_HVM )
+ {
+ ERROR("Unable to restore %s domain into an x86_hvm domain",
+ dhdr_type_to_str(ctx->restore.guest_type));
+ return -1;
+ }
+ else if ( ctx->restore.guest_page_size != PAGE_SIZE )
+ {
+ ERROR("Invalid page size %d for x86_hvm domains",
+ ctx->restore.guest_page_size);
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * restore_ops function.
+ */
+static int x86_hvm_process_record(struct context *ctx, struct record *rec)
+{
+ xc_interface *xch = ctx->xch;
+
+ switch ( rec->type )
+ {
+ case REC_TYPE_TSC_INFO:
+ return handle_tsc_info(ctx, rec);
+
+ case REC_TYPE_HVM_CONTEXT:
+ return handle_hvm_context(ctx, rec);
+
+ case REC_TYPE_HVM_PARAMS:
+ return handle_hvm_params(ctx, rec);
+
+ case REC_TYPE_TOOLSTACK:
+ return handle_toolstack(ctx, rec);
+
+ default:
+ if ( rec->type & REC_TYPE_OPTIONAL )
+ {
+ IPRINTF("Ignoring optional record (0x%"PRIx32", %s)",
+ rec->type, rec_type_to_str(rec->type));
+ return 0;
+ }
+
+ ERROR("Invalid record type (0x%"PRIx32", %s) for x86_hvm domains",
+ rec->type, rec_type_to_str(rec->type));
+ return -1;
+ }
+}
+
+/*
+ * restore_ops function. Sets extra hvm parameters and seeds the grant table.
+ */
+static int x86_hvm_stream_complete(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ int rc;
+
+ rc = xc_set_hvm_param(xch, ctx->domid, HVM_PARAM_STORE_EVTCHN,
+ ctx->restore.xenstore_evtchn);
+ if ( rc )
+ {
+ PERROR("Failed to set HVM_PARAM_STORE_EVTCHN");
+ return rc;
+ }
+
+ rc = xc_dom_gnttab_hvm_seed(xch, ctx->domid,
+ ctx->restore.console_mfn,
+ ctx->restore.xenstore_mfn,
+ ctx->restore.console_domid,
+ ctx->restore.xenstore_domid);
+ if ( rc )
+ {
+ PERROR("Failed to seed grant table");
+ return rc;
+ }
+
+ /*
+ * FIXME: reading the device model state from the stream should be
+ * done by libxl.
+ */
+ rc = dump_qemu(ctx);
+ if ( rc )
+ {
+ ERROR("Failed to dump qemu");
+ return rc;
+ }
+
+ return rc;
+}
+
+static int x86_hvm_cleanup(struct context *ctx)
+{
+ /* no-op */
+ return 0;
+}
+
+struct restore_ops restore_ops_x86_hvm =
+{
+ .localise_page = x86_hvm_localise_page,
+ .setup = x86_hvm_setup,
+ .process_record = x86_hvm_process_record,
+ .stream_complete = x86_hvm_stream_complete,
+ .cleanup = x86_hvm_cleanup,
+};
+
+/*
+ * 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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