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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v8 10/15] tools/libxc: x86 HVM save code
Save the x86 HVM specific parts of the domain. This is considerably simpler
than an x86 PV domain. Only the HVM_CONTEXT and HVM_PARAMS records are
needed.
There is no need for any page normalisation.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
---
tools/libxc/Makefile | 1 +
tools/libxc/xc_sr_common.h | 1 +
tools/libxc/xc_sr_save_x86_hvm.c | 220 ++++++++++++++++++++++++++++++++++++++
3 files changed, 222 insertions(+)
create mode 100644 tools/libxc/xc_sr_save_x86_hvm.c
diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index 524e2e3..97e3c89 100644
--- a/tools/libxc/Makefile
+++ b/tools/libxc/Makefile
@@ -58,6 +58,7 @@ GUEST_SRCS-$(CONFIG_X86) += xc_sr_common_x86.c
GUEST_SRCS-$(CONFIG_X86) += xc_sr_common_x86_pv.c
GUEST_SRCS-$(CONFIG_X86) += xc_sr_restore_x86_pv.c
GUEST_SRCS-$(CONFIG_X86) += xc_sr_save_x86_pv.c
+GUEST_SRCS-$(CONFIG_X86) += xc_sr_save_x86_hvm.c
GUEST_SRCS-y += xc_sr_restore.c
GUEST_SRCS-y += xc_sr_save.c
GUEST_SRCS-y += xc_offline_page.c xc_compression.c
diff --git a/tools/libxc/xc_sr_common.h b/tools/libxc/xc_sr_common.h
index 0488734..cd27246 100644
--- a/tools/libxc/xc_sr_common.h
+++ b/tools/libxc/xc_sr_common.h
@@ -283,6 +283,7 @@ struct xc_sr_context
};
extern struct xc_sr_save_ops save_ops_x86_pv;
+extern struct xc_sr_save_ops save_ops_x86_hvm;
extern struct xc_sr_restore_ops restore_ops_x86_pv;
diff --git a/tools/libxc/xc_sr_save_x86_hvm.c b/tools/libxc/xc_sr_save_x86_hvm.c
new file mode 100644
index 0000000..5b4d336
--- /dev/null
+++ b/tools/libxc/xc_sr_save_x86_hvm.c
@@ -0,0 +1,220 @@
+#include <assert.h>
+
+#include "xc_sr_common_x86.h"
+
+#include <xen/hvm/params.h>
+
+/*
+ * Query for the HVM context and write an HVM_CONTEXT record into the stream.
+ */
+static int write_hvm_context(struct xc_sr_context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ int rc, hvm_buf_size;
+ struct xc_sr_record hvm_rec =
+ {
+ .type = REC_TYPE_HVM_CONTEXT,
+ };
+
+ hvm_buf_size = xc_domain_hvm_getcontext(xch, ctx->domid, 0, 0);
+ if ( hvm_buf_size < 0 )
+ {
+ PERROR("Couldn't get HVM context size from Xen");
+ rc = -1;
+ goto out;
+ }
+
+ hvm_rec.data = malloc(hvm_buf_size);
+ if ( !hvm_rec.data )
+ {
+ PERROR("Couldn't allocate memory");
+ rc = -1;
+ goto out;
+ }
+
+ hvm_buf_size = xc_domain_hvm_getcontext(xch, ctx->domid,
+ hvm_rec.data, hvm_buf_size);
+ if ( hvm_buf_size < 0 )
+ {
+ PERROR("Couldn't get HVM context from Xen");
+ rc = -1;
+ goto out;
+ }
+
+ hvm_rec.length = hvm_buf_size;
+ rc = write_record(ctx, &hvm_rec);
+ if ( rc < 0 )
+ {
+ PERROR("error write HVM_CONTEXT record");
+ goto out;
+ }
+
+ out:
+ free(hvm_rec.data);
+ return rc;
+}
+
+/*
+ * Query for a range of HVM parameters and write an HVM_PARAMS record into the
+ * stream.
+ */
+static int write_hvm_params(struct xc_sr_context *ctx)
+{
+ static const unsigned int params[] = {
+ HVM_PARAM_STORE_PFN,
+ HVM_PARAM_IOREQ_PFN,
+ HVM_PARAM_BUFIOREQ_PFN,
+ HVM_PARAM_PAGING_RING_PFN,
+ HVM_PARAM_ACCESS_RING_PFN,
+ HVM_PARAM_SHARING_RING_PFN,
+ HVM_PARAM_VM86_TSS,
+ HVM_PARAM_CONSOLE_PFN,
+ HVM_PARAM_ACPI_IOPORTS_LOCATION,
+ HVM_PARAM_VIRIDIAN,
+ HVM_PARAM_IDENT_PT,
+ HVM_PARAM_PAE_ENABLED,
+ HVM_PARAM_VM_GENERATION_ID_ADDR,
+ HVM_PARAM_IOREQ_SERVER_PFN,
+ HVM_PARAM_NR_IOREQ_SERVER_PAGES,
+ };
+
+ xc_interface *xch = ctx->xch;
+ struct xc_sr_rec_hvm_params_entry entries[ARRAY_SIZE(params)];
+ struct xc_sr_rec_hvm_params hdr = {
+ .count = 0,
+ };
+ struct xc_sr_record rec = {
+ .type = REC_TYPE_HVM_PARAMS,
+ .length = sizeof(hdr),
+ .data = &hdr,
+ };
+ unsigned int i;
+ int rc;
+
+ for ( i = 0; i < ARRAY_SIZE(params); i++ )
+ {
+ uint32_t index = params[i];
+ uint64_t value;
+
+ rc = xc_get_hvm_param(xch, ctx->domid, index, (unsigned long *)&value);
+ if ( rc )
+ {
+ PERROR("Failed to get HVMPARAM at index %u", index);
+ return rc;
+ }
+
+ if ( value != 0 )
+ {
+ entries[hdr.count].index = index;
+ entries[hdr.count].value = value;
+ hdr.count++;
+ }
+ }
+
+ rc = write_split_record(ctx, &rec, entries, hdr.count * sizeof(*entries));
+ if ( rc )
+ PERROR("Failed to write HVM_PARAMS record");
+
+ return rc;
+}
+
+static xen_pfn_t x86_hvm_pfn_to_gfn(const struct xc_sr_context *ctx,
+ xen_pfn_t pfn)
+{
+ /* identity map */
+ return pfn;
+}
+
+static int x86_hvm_normalise_page(struct xc_sr_context *ctx,
+ xen_pfn_t type, void **page)
+{
+ /* no-op */
+ return 0;
+}
+
+static int x86_hvm_setup(struct xc_sr_context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+
+ if ( !ctx->save.callbacks->switch_qemu_logdirty )
+ {
+ ERROR("No switch_qemu_logdirty callback provided");
+ errno = EINVAL;
+ return -1;
+ }
+
+ if ( ctx->save.callbacks->switch_qemu_logdirty(
+ ctx->domid, 1, ctx->save.callbacks->data) )
+ {
+ PERROR("Couldn't enable qemu log-dirty mode");
+ return -1;
+ }
+
+ ctx->x86_hvm.save.qemu_enabled_logdirty = true;
+
+ return 0;
+}
+
+static int x86_hvm_start_of_stream(struct xc_sr_context *ctx)
+{
+ /* no-op */
+ return 0;
+}
+
+static int x86_hvm_end_of_stream(struct xc_sr_context *ctx)
+{
+ int rc;
+
+ /* Write the TSC record. */
+ rc = write_tsc_info(ctx);
+ if ( rc )
+ return rc;
+
+ /* Write the HVM_CONTEXT record. */
+ rc = write_hvm_context(ctx);
+ if ( rc )
+ return rc;
+
+ /* Write HVM_PARAMS record contains applicable HVM params. */
+ rc = write_hvm_params(ctx);
+ if ( rc )
+ return rc;
+
+ return rc;
+}
+
+static int x86_hvm_cleanup(struct xc_sr_context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+
+ /* If qemu successfully enabled logdirty mode, attempt to disable. */
+ if ( ctx->x86_hvm.save.qemu_enabled_logdirty &&
+ ctx->save.callbacks->switch_qemu_logdirty(
+ ctx->domid, 0, ctx->save.callbacks->data) )
+ {
+ PERROR("Couldn't disable qemu log-dirty mode");
+ return -1;
+ }
+
+ return 0;
+}
+
+struct xc_sr_save_ops save_ops_x86_hvm =
+{
+ .pfn_to_gfn = x86_hvm_pfn_to_gfn,
+ .normalise_page = x86_hvm_normalise_page,
+ .setup = x86_hvm_setup,
+ .start_of_stream = x86_hvm_start_of_stream,
+ .end_of_stream = x86_hvm_end_of_stream,
+ .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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