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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 4/6] tools/libxc: x86 pv common code
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Signed-off-by: Frediano Ziglio <frediano.ziglio@xxxxxxxxxx>
---
tools/libxc/saverestore/common.h | 79 ++++++++++++
tools/libxc/saverestore/common_x86_pv.c | 208 +++++++++++++++++++++++++++++++
tools/libxc/saverestore/common_x86_pv.h | 105 ++++++++++++++++
3 files changed, 392 insertions(+)
create mode 100644 tools/libxc/saverestore/common_x86_pv.c
create mode 100644 tools/libxc/saverestore/common_x86_pv.h
diff --git a/tools/libxc/saverestore/common.h b/tools/libxc/saverestore/common.h
index fff0a39..4220c18 100644
--- a/tools/libxc/saverestore/common.h
+++ b/tools/libxc/saverestore/common.h
@@ -1,8 +1,16 @@
#ifndef __COMMON__H
#define __COMMON__H
+// Hack out junk from the namespace
+#define mfn_to_pfn __UNUSED_mfn_to_pfn
+#define pfn_to_mfn __UNUSED_pfn_to_mfn
+
#include "../xg_private.h"
+#undef mfn_to_pfn
+#undef pfn_to_mfn
+
+
#include "stream_format.h"
// TODO: Find a better place to put this...
@@ -11,6 +19,77 @@
const char *dhdr_type_to_str(uint32_t type);
const char *rec_type_to_str(uint32_t type);
+struct context
+{
+ xc_interface *xch;
+ uint32_t domid;
+ int fd;
+
+ xc_dominfo_t dominfo;
+
+ union
+ {
+ struct
+ {
+ /* From Image Header */
+ uint32_t format_version;
+
+ /* From Domain Header */
+ uint32_t guest_type;
+ uint32_t guest_page_size;
+
+ unsigned long xenstore_mfn, console_mfn;
+ unsigned int xenstore_evtchn, console_evtchn;
+ domid_t xenstore_domid, console_domid;
+ } restore;
+
+ struct
+ {
+ struct save_callbacks *callbacks;
+ } save;
+ };
+
+ union
+ {
+ struct
+ {
+ /* 4 or 8; 32 or 64 bit domain */
+ unsigned int width;
+ /* 3 or 4 pagetable levels */
+ unsigned int levels;
+
+
+ /* Maximum Xen frame */
+ unsigned long max_mfn;
+ /* Read-only machine to phys map */
+ xen_pfn_t *m2p;
+ /* firtst m2p mfn. Incorrectly based on toolstack bitness - FIXME
*/
+ xen_pfn_t m2p_mfn0;
+ /* Number of m2p frames mapped */
+ unsigned long nr_m2p_frames;
+
+
+ /* Maximum guest frame */
+ unsigned long max_pfn;
+ /* Frames per page in guest p2m */
+ unsigned int fpp;
+
+ /* Number of frames making up the p2m */
+ unsigned int p2m_frames;
+ /* Guest's phys to machine map. Mapped read-only (save) or
+ * allocated locally (restore). Uses guest unsigned longs. */
+ void *p2m;
+ /* The guest pfns containing the p2m leaves */
+ xen_pfn_t *p2m_pfns;
+ /* Types for each page */
+ uint32_t *pfn_types;
+
+ /* Read-only mapping of guests shared info page */
+ shared_info_any_t *shinfo;
+ } x86_pv;
+ };
+};
+
#endif
/*
* Local variables:
diff --git a/tools/libxc/saverestore/common_x86_pv.c
b/tools/libxc/saverestore/common_x86_pv.c
new file mode 100644
index 0000000..71fb13d
--- /dev/null
+++ b/tools/libxc/saverestore/common_x86_pv.c
@@ -0,0 +1,208 @@
+#include <assert.h>
+
+#include "common_x86_pv.h"
+
+xen_pfn_t mfn_to_pfn(struct context *ctx, xen_pfn_t mfn)
+{
+ assert(mfn <= ctx->x86_pv.max_mfn);
+ return ctx->x86_pv.m2p[mfn];
+}
+
+xen_pfn_t pfn_to_mfn(struct context *ctx, xen_pfn_t pfn)
+{
+ assert(pfn <= ctx->x86_pv.max_pfn);
+
+ if ( ctx->x86_pv.width == sizeof (uint64_t) )
+ /* 64 bit guest. Need to truncate their pfns for 32 bit toolstacks */
+ return ((uint64_t *)ctx->x86_pv.p2m)[pfn];
+ else
+ {
+ /* 32 bit guest. Need to expand INVALID_MFN fot 64 bit toolstacks */
+ uint32_t mfn = ((uint32_t *)ctx->x86_pv.p2m)[pfn];
+
+ return mfn == ~0U ? INVALID_MFN : mfn;
+ }
+}
+
+void set_p2m(struct context *ctx, xen_pfn_t pfn, xen_pfn_t mfn)
+{
+ assert(pfn <= ctx->x86_pv.max_pfn);
+
+ if ( ctx->x86_pv.width == sizeof (uint64_t) )
+ /* 64 bit guest. Need to expand INVALID_MFN for 32 bit toolstacks */
+ ((uint64_t *)ctx->x86_pv.p2m)[pfn] = mfn == INVALID_MFN ? ~0ULL : mfn;
+ else
+ /* 32 bit guest. Can safely truncate INVALID_MFN fot 64 bit
toolstacks */
+ ((uint32_t *)ctx->x86_pv.p2m)[pfn] = mfn;
+}
+
+bool mfn_in_pseudophysmap(struct context *ctx, xen_pfn_t mfn)
+{
+ return ( (mfn <= ctx->x86_pv.max_mfn) &&
+ (mfn_to_pfn(ctx, mfn) <= ctx->x86_pv.max_pfn) &&
+ (pfn_to_mfn(ctx, mfn_to_pfn(ctx, mfn) == mfn)) );
+}
+
+void pseudophysmap_walk(struct context *ctx, xen_pfn_t mfn)
+{
+ xc_interface *xch = ctx->xch;
+ xen_pfn_t pfn = ~0UL;
+
+ ERROR("mfn %#lx, max %#lx", mfn, ctx->x86_pv.max_mfn);
+
+ if ( (mfn != ~0UL) && (mfn <= ctx->x86_pv.max_mfn) )
+ {
+ pfn = ctx->x86_pv.m2p[mfn];
+ ERROR(" m2p[%#lx] = %#lx, max_pfn %#lx",
+ mfn, pfn, ctx->x86_pv.max_pfn);
+ }
+
+ if ( (pfn != ~0UL) && (pfn <= ctx->x86_pv.max_pfn) )
+ ERROR(" p2m[%#lx] = %#lx",
+ pfn, pfn_to_mfn(ctx, pfn));
+}
+
+xen_pfn_t cr3_to_mfn(struct context *ctx, uint64_t cr3)
+{
+ if ( ctx->x86_pv.width == 8 )
+ return cr3 >> 12;
+ else
+ return (((uint32_t)cr3 >> 12) | ((uint32_t)cr3 << 20));
+}
+
+uint64_t mfn_to_cr3(struct context *ctx, xen_pfn_t mfn)
+{
+ if ( ctx->x86_pv.width == 8 )
+ return ((uint64_t)mfn) << 12;
+ else
+ return (((uint32_t)mfn << 12) | ((uint32_t)mfn >> 20));
+}
+
+int x86_pv_domain_info(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ unsigned int guest_width, guest_levels, fpp;
+ int max_pfn;
+
+ /* Get the domain width */
+ if ( xc_domain_get_guest_width(xch, ctx->domid, &guest_width) )
+ {
+ PERROR("Unable to determine dom%d's width", ctx->domid);
+ return -1;
+ }
+ else if ( guest_width == 4 )
+ guest_levels = 3;
+ else if ( guest_width == 8 )
+ guest_levels = 4;
+ else
+ {
+ ERROR("Invalid guest width %d. Expected 32 or 64", guest_width);
+ return -1;
+ }
+ ctx->x86_pv.width = guest_width;
+ ctx->x86_pv.levels = guest_levels;
+ ctx->x86_pv.fpp = fpp = PAGE_SIZE / ctx->x86_pv.width;
+
+ DPRINTF("%d bits, %d levels", guest_width * 8, guest_levels);
+
+ /* Get the domains maximum pfn */
+ max_pfn = xc_domain_maximum_gpfn(xch, ctx->domid);
+ if ( max_pfn < 0 )
+ {
+ PERROR("Unable to obtain guests max pfn");
+ return -1;
+ }
+ else if ( max_pfn >= ~XEN_DOMCTL_PFINFO_LTAB_MASK )
+ {
+ errno = E2BIG;
+ PERROR("Cannot save a guest this large %#x");
+ return -1;
+ }
+ else if ( max_pfn > 0 )
+ {
+ ctx->x86_pv.max_pfn = max_pfn;
+ ctx->x86_pv.p2m_frames = (ctx->x86_pv.max_pfn + fpp) / fpp;
+
+ DPRINTF("max_pfn %#x, p2m_frames %d", max_pfn, ctx->x86_pv.p2m_frames);
+ }
+
+ return 0;
+}
+
+int x86_pv_map_m2p(struct context *ctx)
+{
+ xc_interface *xch = ctx->xch;
+ long max_page = xc_maximum_ram_page(xch);
+ unsigned long m2p_chunks, m2p_size;
+ privcmd_mmap_entry_t *entries = NULL;
+ xen_pfn_t *extents_start = NULL;
+ int rc = -1, i;
+
+ if ( max_page < 0 )
+ {
+ PERROR("Failed to get maximum ram page");
+ goto err;
+ }
+
+ ctx->x86_pv.max_mfn = max_page;
+ m2p_size = M2P_SIZE(ctx->x86_pv.max_mfn);
+ m2p_chunks = M2P_CHUNKS(ctx->x86_pv.max_mfn);
+
+ extents_start = malloc(m2p_chunks * sizeof(xen_pfn_t));
+ if ( !extents_start )
+ {
+ ERROR("Unable to allocate %zu bytes for m2p mfns",
+ m2p_chunks * sizeof(xen_pfn_t));
+ goto err;
+ }
+
+ if ( xc_machphys_mfn_list(xch, m2p_chunks, extents_start) )
+ {
+ PERROR("Failed to get m2p mfn list");
+ goto err;
+ }
+
+ entries = malloc(m2p_chunks * sizeof(privcmd_mmap_entry_t));
+ if ( !entries )
+ {
+ ERROR("Unable to allocate %zu bytes for m2p mapping mfns",
+ m2p_chunks * sizeof(privcmd_mmap_entry_t));
+ goto err;
+ }
+
+ for ( i = 0; i < m2p_chunks; ++i )
+ entries[i].mfn = extents_start[i];
+
+ ctx->x86_pv.m2p = xc_map_foreign_ranges(
+ xch, DOMID_XEN, m2p_size, PROT_READ,
+ M2P_CHUNK_SIZE, entries, m2p_chunks);
+
+ if ( !ctx->x86_pv.m2p )
+ {
+ PERROR("Failed to mmap m2p ranges");
+ goto err;
+ }
+
+ ctx->x86_pv.nr_m2p_frames = (M2P_CHUNK_SIZE >> PAGE_SHIFT) * m2p_chunks;
+ ctx->x86_pv.m2p_mfn0 = entries[0].mfn;
+
+ /* All Done */
+ rc = 0;
+ DPRINTF("max_mfn %#lx", ctx->x86_pv.max_mfn);
+
+err:
+ free(entries);
+ free(extents_start);
+
+ return rc;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/tools/libxc/saverestore/common_x86_pv.h
b/tools/libxc/saverestore/common_x86_pv.h
new file mode 100644
index 0000000..ba1b60f
--- /dev/null
+++ b/tools/libxc/saverestore/common_x86_pv.h
@@ -0,0 +1,105 @@
+#ifndef __COMMON_X86_PV_H
+#define __COMMON_X86_PV_H
+
+#include <stdbool.h>
+#include "common.h"
+
+/*
+ * Convert an mfn to a pfn, given Xens m2p table.
+ *
+ * Caller must ensure that the requested mfn is in range.
+ */
+xen_pfn_t mfn_to_pfn(struct context *ctx, xen_pfn_t mfn);
+
+/*
+ * Convert a pfn to an mfn, given the guests p2m table.
+ *
+ * Caller must ensure that the requested pfn is in range.
+ */
+xen_pfn_t pfn_to_mfn(struct context *ctx, xen_pfn_t pfn);
+
+/*
+ * Set a mapping in the p2m table.
+ *
+ * Caller must ensure that the requested pfn is in range.
+ */
+void set_p2m(struct context *ctx, xen_pfn_t pfn, xen_pfn_t mfn);
+
+/*
+ * Query whether a particular mfn is valid in the physmap of a guest.
+ */
+bool mfn_in_pseudophysmap(struct context *ctx, xen_pfn_t mfn);
+
+/*
+ * Debug a particular mfn by walking the p2m and m2p.
+ */
+void pseudophysmap_walk(struct context *ctx, xen_pfn_t mfn);
+
+/*
+ * Convert a PV cr3 field to an mfn.
+ */
+xen_pfn_t cr3_to_mfn(struct context *ctx, uint64_t cr3);
+
+/*
+ * Convert an mfn to a PV cr3 field.
+ */
+uint64_t mfn_to_cr3(struct context *ctx, xen_pfn_t mfn);
+
+/*
+ * Extract an MFN from a Pagetable Entry.
+ */
+static inline xen_pfn_t pte_to_frame(struct context *ctx, uint64_t pte)
+{
+ if ( ctx->x86_pv.width == 8 )
+ return (pte >> PAGE_SHIFT) & ((1ULL << (52 - PAGE_SHIFT)) - 1);
+ else
+ return (pte >> PAGE_SHIFT) & ((1ULL << (44 - PAGE_SHIFT)) - 1);
+}
+
+static inline void update_pte(struct context *ctx, uint64_t *pte, xen_pfn_t
pfn)
+{
+ if ( ctx->x86_pv.width == 8 )
+ *pte &= ~(((1ULL << (52 - PAGE_SHIFT)) - 1) << PAGE_SHIFT);
+ else
+ *pte &= ~(((1ULL << (44 - PAGE_SHIFT)) - 1) << PAGE_SHIFT);
+
+ *pte |= (uint64_t)pfn << PAGE_SHIFT;
+}
+
+/*
+ * Get current domain information.
+ *
+ * Fills ctx->x86_pv
+ * - .width
+ * - .levels
+ * - .fpp
+ * - .p2m_frames
+ *
+ * Used by the save side to create the X86_PV_INFO record, and by the restore
+ * side to verify the incoming stream.
+ *
+ * Returns 0 on success and non-zero on error.
+ */
+int x86_pv_domain_info(struct context *ctx);
+
+/*
+ * Maps the Xen M2P.
+ *
+ * Fills ctx->x86_pv.
+ * - .max_mfn
+ * - .m2p
+ *
+ * Returns 0 on success and non-zero on error.
+ */
+int x86_pv_map_m2p(struct context *ctx);
+
+#endif
+/*
+ * 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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