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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2 2/6] tools/libs/ctrl: fix xc_core_arch_map_p2m() to support linear p2m table
The core of a pv linux guest produced via "xl dump-core" is not usable
as since kernel 4.14 only the linear p2m table is kept if Xen indicates
it is supporting that. Unfortunately xc_core_arch_map_p2m() is still
supporting the 3-level p2m tree only.
Fix that by copying the functionality of map_p2m() from libxenguest to
libxenctrl.
Additionally the mapped p2m isn't of a fixed length now, so the
interface to the mapping functions needs to be adapted. In order not to
add even more parameters, expand struct domain_info_context and use a
pointer to that as a parameter.
Fixes: dc6d60937121 ("libxc: set flag for support of linear p2m list in domain
builder")
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
This is a backport candidate.
---
tools/include/xenguest.h | 1 +
tools/libs/ctrl/xc_core.c | 5 +-
tools/libs/ctrl/xc_core.h | 8 +-
tools/libs/ctrl/xc_core_arm.c | 23 +--
tools/libs/ctrl/xc_core_x86.c | 256 ++++++++++++++++++++++++++++------
tools/libs/ctrl/xc_private.h | 1 +
tools/libs/guest/xg_domain.c | 17 +--
7 files changed, 233 insertions(+), 78 deletions(-)
diff --git a/tools/include/xenguest.h b/tools/include/xenguest.h
index 217022b6e7..781d40c119 100644
--- a/tools/include/xenguest.h
+++ b/tools/include/xenguest.h
@@ -700,6 +700,7 @@ struct xc_domain_meminfo {
xen_pfn_t *pfn_type;
xen_pfn_t *p2m_table;
unsigned long p2m_size;
+ unsigned int p2m_frames;
};
int xc_map_domain_meminfo(xc_interface *xch, uint32_t domid,
diff --git a/tools/libs/ctrl/xc_core.c b/tools/libs/ctrl/xc_core.c
index b47ab2f6d8..9576bec5a3 100644
--- a/tools/libs/ctrl/xc_core.c
+++ b/tools/libs/ctrl/xc_core.c
@@ -574,8 +574,7 @@ xc_domain_dumpcore_via_callback(xc_interface *xch,
goto out;
}
- sts = xc_core_arch_map_p2m(xch, dinfo->guest_width, &info, live_shinfo,
- &p2m, &dinfo->p2m_size);
+ sts = xc_core_arch_map_p2m(xch, dinfo, &info, live_shinfo, &p2m);
if ( sts != 0 )
goto out;
@@ -945,7 +944,7 @@ out:
if ( memory_map != NULL )
free(memory_map);
if ( p2m != NULL )
- munmap(p2m, PAGE_SIZE * P2M_FL_ENTRIES);
+ munmap(p2m, PAGE_SIZE * dinfo->p2m_frames);
if ( p2m_array != NULL )
free(p2m_array);
if ( pfn_array != NULL )
diff --git a/tools/libs/ctrl/xc_core.h b/tools/libs/ctrl/xc_core.h
index 36fb755da2..8ea1f93a10 100644
--- a/tools/libs/ctrl/xc_core.h
+++ b/tools/libs/ctrl/xc_core.h
@@ -138,14 +138,14 @@ int xc_core_arch_memory_map_get(xc_interface *xch,
xc_dominfo_t *info, shared_info_any_t
*live_shinfo,
xc_core_memory_map_t **mapp,
unsigned int *nr_entries);
-int xc_core_arch_map_p2m(xc_interface *xch, unsigned int guest_width,
+int xc_core_arch_map_p2m(xc_interface *xch, struct domain_info_context *dinfo,
xc_dominfo_t *info, shared_info_any_t *live_shinfo,
- xen_pfn_t **live_p2m, unsigned long *pfnp);
+ xen_pfn_t **live_p2m);
-int xc_core_arch_map_p2m_writable(xc_interface *xch, unsigned int guest_width,
+int xc_core_arch_map_p2m_writable(xc_interface *xch, struct
domain_info_context *dinfo,
xc_dominfo_t *info,
shared_info_any_t *live_shinfo,
- xen_pfn_t **live_p2m, unsigned long *pfnp);
+ xen_pfn_t **live_p2m);
int xc_core_arch_get_scratch_gpfn(xc_interface *xch, uint32_t domid,
xen_pfn_t *gpfn);
diff --git a/tools/libs/ctrl/xc_core_arm.c b/tools/libs/ctrl/xc_core_arm.c
index 7b587b4cc5..93765a565f 100644
--- a/tools/libs/ctrl/xc_core_arm.c
+++ b/tools/libs/ctrl/xc_core_arm.c
@@ -66,33 +66,24 @@ xc_core_arch_memory_map_get(xc_interface *xch, struct
xc_core_arch_context *unus
static int
xc_core_arch_map_p2m_rw(xc_interface *xch, struct domain_info_context *dinfo,
xc_dominfo_t *info,
- shared_info_any_t *live_shinfo, xen_pfn_t **live_p2m,
- unsigned long *pfnp, int rw)
+ shared_info_any_t *live_shinfo, xen_pfn_t **live_p2m,
int rw)
{
errno = ENOSYS;
return -1;
}
int
-xc_core_arch_map_p2m(xc_interface *xch, unsigned int guest_width, xc_dominfo_t
*info,
- shared_info_any_t *live_shinfo, xen_pfn_t **live_p2m,
- unsigned long *pfnp)
+xc_core_arch_map_p2m(xc_interface *xch, struct domain_info_context *dinfo,
xc_dominfo_t *info,
+ shared_info_any_t *live_shinfo, xen_pfn_t **live_p2m)
{
- struct domain_info_context _dinfo = { .guest_width = guest_width };
- struct domain_info_context *dinfo = &_dinfo;
- return xc_core_arch_map_p2m_rw(xch, dinfo, info,
- live_shinfo, live_p2m, pfnp, 0);
+ return xc_core_arch_map_p2m_rw(xch, dinfo, info, live_shinfo, live_p2m, 0);
}
int
-xc_core_arch_map_p2m_writable(xc_interface *xch, unsigned int guest_width,
xc_dominfo_t *info,
- shared_info_any_t *live_shinfo, xen_pfn_t
**live_p2m,
- unsigned long *pfnp)
+xc_core_arch_map_p2m_writable(xc_interface *xch, struct domain_info_context
*dinfo, xc_dominfo_t *info,
+ shared_info_any_t *live_shinfo, xen_pfn_t
**live_p2m)
{
- struct domain_info_context _dinfo = { .guest_width = guest_width };
- struct domain_info_context *dinfo = &_dinfo;
- return xc_core_arch_map_p2m_rw(xch, dinfo, info,
- live_shinfo, live_p2m, pfnp, 1);
+ return xc_core_arch_map_p2m_rw(xch, dinfo, info, live_shinfo, live_p2m, 1);
}
int
diff --git a/tools/libs/ctrl/xc_core_x86.c b/tools/libs/ctrl/xc_core_x86.c
index cb76e6207b..c8f71d4b75 100644
--- a/tools/libs/ctrl/xc_core_x86.c
+++ b/tools/libs/ctrl/xc_core_x86.c
@@ -17,6 +17,7 @@
*
*/
+#include <inttypes.h>
#include "xc_private.h"
#include "xc_core.h"
#include <xen/hvm/e820.h>
@@ -65,34 +66,169 @@ xc_core_arch_memory_map_get(xc_interface *xch, struct
xc_core_arch_context *unus
return 0;
}
-static int
-xc_core_arch_map_p2m_rw(xc_interface *xch, struct domain_info_context *dinfo,
xc_dominfo_t *info,
- shared_info_any_t *live_shinfo, xen_pfn_t **live_p2m,
- unsigned long *pfnp, int rw)
+static inline bool is_canonical_address(uint64_t vaddr)
{
- /* Double and single indirect references to the live P2M table */
- xen_pfn_t *live_p2m_frame_list_list = NULL;
- xen_pfn_t *live_p2m_frame_list = NULL;
- /* Copies of the above. */
- xen_pfn_t *p2m_frame_list_list = NULL;
- xen_pfn_t *p2m_frame_list = NULL;
+ return ((int64_t)vaddr >> 47) == ((int64_t)vaddr >> 63);
+}
- uint32_t dom = info->domid;
- int ret = -1;
- int err;
- int i;
+/* Virtual address ranges reserved for hypervisor. */
+#define HYPERVISOR_VIRT_START_X86_64 0xFFFF800000000000ULL
+#define HYPERVISOR_VIRT_END_X86_64 0xFFFF87FFFFFFFFFFULL
- if ( xc_domain_nr_gpfns(xch, info->domid, &dinfo->p2m_size) < 0 )
+#define HYPERVISOR_VIRT_START_X86_32 0x00000000F5800000ULL
+#define HYPERVISOR_VIRT_END_X86_32 0x00000000FFFFFFFFULL
+
+static xen_pfn_t *
+xc_core_arch_map_p2m_list_rw(xc_interface *xch, struct domain_info_context
*dinfo,
+ uint32_t dom, shared_info_any_t *live_shinfo,
+ uint64_t p2m_cr3)
+{
+ uint64_t p2m_vaddr, p2m_end, mask, off;
+ xen_pfn_t p2m_mfn, mfn, saved_mfn, max_pfn;
+ uint64_t *ptes = NULL;
+ xen_pfn_t *mfns = NULL;
+ unsigned int fpp, n_pages, level, n_levels, shift,
+ idx_start, idx_end, idx, saved_idx;
+
+ p2m_vaddr = GET_FIELD(live_shinfo, arch.p2m_vaddr, dinfo->guest_width);
+ fpp = PAGE_SIZE / dinfo->guest_width;
+ dinfo->p2m_frames = (dinfo->p2m_size - 1) / fpp + 1;
+ p2m_end = p2m_vaddr + dinfo->p2m_frames * PAGE_SIZE - 1;
+
+ if ( dinfo->guest_width == 8 )
{
- ERROR("Could not get maximum GPFN!");
- goto out;
+ mask = 0x0000ffffffffffffULL;
+ n_levels = 4;
+ p2m_mfn = p2m_cr3 >> 12;
+ if ( !is_canonical_address(p2m_vaddr) ||
+ !is_canonical_address(p2m_end) ||
+ p2m_end < p2m_vaddr ||
+ (p2m_vaddr <= HYPERVISOR_VIRT_END_X86_64 &&
+ p2m_end > HYPERVISOR_VIRT_START_X86_64) )
+ {
+ ERROR("Bad virtual p2m address range %#" PRIx64 "-%#" PRIx64,
+ p2m_vaddr, p2m_end);
+ errno = ERANGE;
+ goto out;
+ }
+ }
+ else
+ {
+ mask = 0x00000000ffffffffULL;
+ n_levels = 3;
+ if ( p2m_cr3 & ~mask )
+ p2m_mfn = ~0UL;
+ else
+ p2m_mfn = (uint32_t)((p2m_cr3 >> 12) | (p2m_cr3 << 20));
+ if ( p2m_vaddr > mask || p2m_end > mask || p2m_end < p2m_vaddr ||
+ (p2m_vaddr <= HYPERVISOR_VIRT_END_X86_32 &&
+ p2m_end > HYPERVISOR_VIRT_START_X86_32) )
+ {
+ ERROR("Bad virtual p2m address range %#" PRIx64 "-%#" PRIx64,
+ p2m_vaddr, p2m_end);
+ errno = ERANGE;
+ goto out;
+ }
}
- if ( dinfo->p2m_size < info->nr_pages )
+ mfns = malloc(sizeof(*mfns));
+ if ( !mfns )
{
- ERROR("p2m_size < nr_pages -1 (%lx < %lx", dinfo->p2m_size,
info->nr_pages - 1);
+ ERROR("Cannot allocate memory for array of %u mfns", 1);
goto out;
}
+ mfns[0] = p2m_mfn;
+ off = 0;
+ saved_mfn = 0;
+ idx_start = idx_end = saved_idx = 0;
+
+ for ( level = n_levels; level > 0; level-- )
+ {
+ n_pages = idx_end - idx_start + 1;
+ ptes = xc_map_foreign_pages(xch, dom, PROT_READ, mfns, n_pages);
+ if ( !ptes )
+ {
+ PERROR("Failed to map %u page table pages for p2m list", n_pages);
+ goto out;
+ }
+ free(mfns);
+
+ shift = level * 9 + 3;
+ idx_start = ((p2m_vaddr - off) & mask) >> shift;
+ idx_end = ((p2m_end - off) & mask) >> shift;
+ idx = idx_end - idx_start + 1;
+ mfns = malloc(sizeof(*mfns) * idx);
+ if ( !mfns )
+ {
+ ERROR("Cannot allocate memory for array of %u mfns", idx);
+ goto out;
+ }
+
+ for ( idx = idx_start; idx <= idx_end; idx++ )
+ {
+ mfn = (ptes[idx] & 0x000ffffffffff000ULL) >> PAGE_SHIFT;
+ if ( mfn == 0 )
+ {
+ ERROR("Bad mfn %#lx during page table walk for vaddr %#"
PRIx64 " at level %d of p2m list",
+ mfn, off + ((uint64_t)idx << shift), level);
+ errno = ERANGE;
+ goto out;
+ }
+ mfns[idx - idx_start] = mfn;
+
+ /* Maximum pfn check at level 2. Same reasoning as for p2m tree. */
+ if ( level == 2 )
+ {
+ if ( mfn != saved_mfn )
+ {
+ saved_mfn = mfn;
+ saved_idx = idx - idx_start;
+ }
+ }
+ }
+
+ if ( level == 2 )
+ {
+ if ( saved_idx == idx_end )
+ saved_idx++;
+ max_pfn = ((xen_pfn_t)saved_idx << 9) * fpp;
+ if ( max_pfn < dinfo->p2m_size )
+ {
+ dinfo->p2m_size = max_pfn;
+ dinfo->p2m_frames = (dinfo->p2m_size + fpp - 1) / fpp;
+ p2m_end = p2m_vaddr + dinfo->p2m_frames * PAGE_SIZE - 1;
+ idx_end = idx_start + saved_idx;
+ }
+ }
+
+ munmap(ptes, n_pages * PAGE_SIZE);
+ ptes = NULL;
+ off = p2m_vaddr & ((mask >> shift) << shift);
+ }
+
+ return mfns;
+
+ out:
+ free(mfns);
+ if ( ptes )
+ munmap(ptes, n_pages * PAGE_SIZE);
+
+ return NULL;
+}
+
+static xen_pfn_t *
+xc_core_arch_map_p2m_tree_rw(xc_interface *xch, struct domain_info_context
*dinfo,
+ uint32_t dom, shared_info_any_t *live_shinfo)
+{
+ /* Double and single indirect references to the live P2M table */
+ xen_pfn_t *live_p2m_frame_list_list;
+ xen_pfn_t *live_p2m_frame_list = NULL;
+ /* Copies of the above. */
+ xen_pfn_t *p2m_frame_list_list = NULL;
+ xen_pfn_t *p2m_frame_list;
+
+ int err;
+ int i;
live_p2m_frame_list_list =
xc_map_foreign_range(xch, dom, PAGE_SIZE, PROT_READ,
@@ -151,10 +287,60 @@ xc_core_arch_map_p2m_rw(xc_interface *xch, struct
domain_info_context *dinfo, xc
for ( i = P2M_FL_ENTRIES - 1; i >= 0; i-- )
p2m_frame_list[i] = ((uint32_t *)p2m_frame_list)[i];
+ dinfo->p2m_frames = P2M_FL_ENTRIES;
+
+ return p2m_frame_list;
+
+ out:
+ err = errno;
+
+ if ( live_p2m_frame_list_list )
+ munmap(live_p2m_frame_list_list, PAGE_SIZE);
+
+ if ( live_p2m_frame_list )
+ munmap(live_p2m_frame_list, P2M_FLL_ENTRIES * PAGE_SIZE);
+
+ free(p2m_frame_list_list);
+
+ errno = err;
+
+ return NULL;
+}
+
+static int
+xc_core_arch_map_p2m_rw(xc_interface *xch, struct domain_info_context *dinfo,
xc_dominfo_t *info,
+ shared_info_any_t *live_shinfo, xen_pfn_t **live_p2m,
int rw)
+{
+ xen_pfn_t *p2m_frame_list = NULL;
+ uint64_t p2m_cr3;
+ uint32_t dom = info->domid;
+ int ret = -1;
+ int err;
+
+ if ( xc_domain_nr_gpfns(xch, info->domid, &dinfo->p2m_size) < 0 )
+ {
+ ERROR("Could not get maximum GPFN!");
+ goto out;
+ }
+
+ if ( dinfo->p2m_size < info->nr_pages )
+ {
+ ERROR("p2m_size < nr_pages -1 (%lx < %lx", dinfo->p2m_size,
info->nr_pages - 1);
+ goto out;
+ }
+
+ p2m_cr3 = GET_FIELD(live_shinfo, arch.p2m_cr3, dinfo->guest_width);
+
+ p2m_frame_list = p2m_cr3 ? xc_core_arch_map_p2m_list_rw(xch, dinfo, dom,
live_shinfo, p2m_cr3)
+ : xc_core_arch_map_p2m_tree_rw(xch, dinfo, dom,
live_shinfo);
+
+ if ( !p2m_frame_list )
+ goto out;
+
*live_p2m = xc_map_foreign_pages(xch, dom,
rw ? (PROT_READ | PROT_WRITE) : PROT_READ,
p2m_frame_list,
- P2M_FL_ENTRIES);
+ dinfo->p2m_frames);
if ( !*live_p2m )
{
@@ -162,21 +348,11 @@ xc_core_arch_map_p2m_rw(xc_interface *xch, struct
domain_info_context *dinfo, xc
goto out;
}
- *pfnp = dinfo->p2m_size;
-
ret = 0;
out:
err = errno;
- if ( live_p2m_frame_list_list )
- munmap(live_p2m_frame_list_list, PAGE_SIZE);
-
- if ( live_p2m_frame_list )
- munmap(live_p2m_frame_list, P2M_FLL_ENTRIES * PAGE_SIZE);
-
- free(p2m_frame_list_list);
-
free(p2m_frame_list);
errno = err;
@@ -184,25 +360,17 @@ out:
}
int
-xc_core_arch_map_p2m(xc_interface *xch, unsigned int guest_width, xc_dominfo_t
*info,
- shared_info_any_t *live_shinfo, xen_pfn_t **live_p2m,
- unsigned long *pfnp)
+xc_core_arch_map_p2m(xc_interface *xch, struct domain_info_context *dinfo,
xc_dominfo_t *info,
+ shared_info_any_t *live_shinfo, xen_pfn_t **live_p2m)
{
- struct domain_info_context _dinfo = { .guest_width = guest_width };
- struct domain_info_context *dinfo = &_dinfo;
- return xc_core_arch_map_p2m_rw(xch, dinfo, info,
- live_shinfo, live_p2m, pfnp, 0);
+ return xc_core_arch_map_p2m_rw(xch, dinfo, info, live_shinfo, live_p2m, 0);
}
int
-xc_core_arch_map_p2m_writable(xc_interface *xch, unsigned int guest_width,
xc_dominfo_t *info,
- shared_info_any_t *live_shinfo, xen_pfn_t
**live_p2m,
- unsigned long *pfnp)
+xc_core_arch_map_p2m_writable(xc_interface *xch, struct domain_info_context
*dinfo, xc_dominfo_t *info,
+ shared_info_any_t *live_shinfo, xen_pfn_t
**live_p2m)
{
- struct domain_info_context _dinfo = { .guest_width = guest_width };
- struct domain_info_context *dinfo = &_dinfo;
- return xc_core_arch_map_p2m_rw(xch, dinfo, info,
- live_shinfo, live_p2m, pfnp, 1);
+ return xc_core_arch_map_p2m_rw(xch, dinfo, info, live_shinfo, live_p2m, 1);
}
int
diff --git a/tools/libs/ctrl/xc_private.h b/tools/libs/ctrl/xc_private.h
index f0b5f83ac8..8ebc0b59da 100644
--- a/tools/libs/ctrl/xc_private.h
+++ b/tools/libs/ctrl/xc_private.h
@@ -79,6 +79,7 @@ struct iovec {
struct domain_info_context {
unsigned int guest_width;
+ unsigned int p2m_frames;
unsigned long p2m_size;
};
diff --git a/tools/libs/guest/xg_domain.c b/tools/libs/guest/xg_domain.c
index 5019c84e0e..dd7db2cbd8 100644
--- a/tools/libs/guest/xg_domain.c
+++ b/tools/libs/guest/xg_domain.c
@@ -24,13 +24,9 @@
int xc_unmap_domain_meminfo(xc_interface *xch, struct xc_domain_meminfo *minfo)
{
- struct domain_info_context _di = { .guest_width = minfo->guest_width,
- .p2m_size = minfo->p2m_size};
- struct domain_info_context *dinfo = &_di;
-
free(minfo->pfn_type);
if ( minfo->p2m_table )
- munmap(minfo->p2m_table, P2M_FL_ENTRIES * PAGE_SIZE);
+ munmap(minfo->p2m_table, minfo->p2m_frames * PAGE_SIZE);
minfo->p2m_table = NULL;
return 0;
@@ -40,7 +36,6 @@ int xc_map_domain_meminfo(xc_interface *xch, uint32_t domid,
struct xc_domain_meminfo *minfo)
{
struct domain_info_context _di;
- struct domain_info_context *dinfo = &_di;
xc_dominfo_t info;
shared_info_any_t *live_shinfo;
@@ -96,16 +91,16 @@ int xc_map_domain_meminfo(xc_interface *xch, uint32_t domid,
return -1;
}
- if ( xc_core_arch_map_p2m_writable(xch, minfo->guest_width, &info,
- live_shinfo, &minfo->p2m_table,
- &minfo->p2m_size) )
+ if ( xc_core_arch_map_p2m_writable(xch, &_di, &info,
+ live_shinfo, &minfo->p2m_table) )
{
PERROR("Could not map the P2M table");
munmap(live_shinfo, PAGE_SIZE);
return -1;
}
munmap(live_shinfo, PAGE_SIZE);
- _di.p2m_size = minfo->p2m_size;
+ minfo->p2m_size = _di.p2m_size;
+ minfo->p2m_frames = _di.p2m_frames;
/* Make space and prepare for getting the PFN types */
minfo->pfn_type = calloc(sizeof(*minfo->pfn_type), minfo->p2m_size);
@@ -141,7 +136,7 @@ failed:
}
if ( minfo->p2m_table )
{
- munmap(minfo->p2m_table, P2M_FL_ENTRIES * PAGE_SIZE);
+ munmap(minfo->p2m_table, minfo->p2m_frames * PAGE_SIZE);
minfo->p2m_table = NULL;
}
--
2.26.2
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