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|
/******************************************************************************
* common/compat/grant_table.c
*
*/
#include <compat/grant_table.h>
#define xen_grant_entry_v1 grant_entry_v1
CHECK_grant_entry_v1;
#undef xen_grant_entry_v1
#define xen_grant_entry_header grant_entry_header
CHECK_grant_entry_header;
#undef xen_grant_entry_header
#define xen_grant_entry_v2 grant_entry_v2
CHECK_grant_entry_v2;
#undef xen_grant_entry_v2
#define xen_gnttab_map_grant_ref gnttab_map_grant_ref
CHECK_gnttab_map_grant_ref;
#undef xen_gnttab_map_grant_ref
#define xen_gnttab_unmap_grant_ref gnttab_unmap_grant_ref
CHECK_gnttab_unmap_grant_ref;
#undef xen_gnttab_unmap_grant_ref
#define xen_gnttab_unmap_and_replace gnttab_unmap_and_replace
CHECK_gnttab_unmap_and_replace;
#undef xen_gnttab_unmap_and_replace
DEFINE_XEN_GUEST_HANDLE(gnttab_setup_table_compat_t);
DEFINE_XEN_GUEST_HANDLE(gnttab_transfer_compat_t);
DEFINE_XEN_GUEST_HANDLE(gnttab_copy_compat_t);
#define xen_gnttab_dump_table gnttab_dump_table
CHECK_gnttab_dump_table;
#undef xen_gnttab_dump_table
#define xen_gnttab_set_version gnttab_set_version
CHECK_gnttab_set_version;
#undef xen_gnttab_set_version
DEFINE_XEN_GUEST_HANDLE(gnttab_get_status_frames_compat_t);
#define xen_gnttab_get_version gnttab_get_version
CHECK_gnttab_get_version;
#undef xen_gnttab_get_version
int compat_grant_table_op(unsigned int cmd,
XEN_GUEST_HANDLE(void) cmp_uop,
unsigned int count)
{
int rc = 0;
unsigned int i;
XEN_GUEST_HANDLE(void) cnt_uop;
set_xen_guest_handle(cnt_uop, NULL);
switch ( cmd )
{
#define CASE(name) \
case GNTTABOP_##name: \
if ( unlikely(!guest_handle_okay(guest_handle_cast(cmp_uop, \
gnttab_##name##_compat_t), \
count)) ) \
rc = -EFAULT; \
break
#ifndef CHECK_gnttab_map_grant_ref
CASE(map_grant_ref);
#endif
#ifndef CHECK_gnttab_unmap_grant_ref
CASE(unmap_grant_ref);
#endif
#ifndef CHECK_gnttab_unmap_and_replace
CASE(unmap_and_replace);
#endif
#ifndef CHECK_gnttab_setup_table
CASE(setup_table);
#endif
#ifndef CHECK_gnttab_transfer
CASE(transfer);
#endif
#ifndef CHECK_gnttab_copy
CASE(copy);
#endif
#ifndef CHECK_gnttab_dump_table
CASE(dump_table);
#endif
#ifndef CHECK_gnttab_get_status_frames
CASE(get_status_frames);
#endif
#undef CASE
default:
return do_grant_table_op(cmd, cmp_uop, count);
}
if ( (int)count < 0 )
rc = -EINVAL;
for ( i = 0; i < count && rc == 0; )
{
unsigned int n;
union {
XEN_GUEST_HANDLE(void) uop;
struct gnttab_setup_table *setup;
struct gnttab_transfer *xfer;
struct gnttab_copy *copy;
struct gnttab_get_status_frames *get_status;
} nat;
union {
struct compat_gnttab_setup_table setup;
struct compat_gnttab_transfer xfer;
struct compat_gnttab_copy copy;
struct compat_gnttab_get_status_frames get_status;
} cmp;
set_xen_guest_handle(nat.uop, COMPAT_ARG_XLAT_VIRT_BASE);
switch ( cmd )
{
case GNTTABOP_setup_table:
if ( unlikely(count > 1) )
rc = -EINVAL;
else if ( unlikely(__copy_from_guest(&cmp.setup, cmp_uop, 1)) )
rc = -EFAULT;
else if ( unlikely(!compat_handle_okay(cmp.setup.frame_list, cmp.setup.nr_frames)) )
rc = -EFAULT;
else
{
unsigned int max_frame_list_size_in_page =
(COMPAT_ARG_XLAT_SIZE - sizeof(*nat.setup)) /
sizeof(*nat.setup->frame_list.p);
if ( max_frame_list_size_in_page < max_nr_grant_frames )
{
gdprintk(XENLOG_WARNING,
"max_nr_grant_frames is too large (%u,%u)\n",
max_nr_grant_frames, max_frame_list_size_in_page);
rc = -EINVAL;
}
else
{
#define XLAT_gnttab_setup_table_HNDL_frame_list(_d_, _s_) \
set_xen_guest_handle((_d_)->frame_list, (unsigned long *)(nat.setup + 1))
XLAT_gnttab_setup_table(nat.setup, &cmp.setup);
#undef XLAT_gnttab_setup_table_HNDL_frame_list
rc = gnttab_setup_table(guest_handle_cast(nat.uop, gnttab_setup_table_t), 1);
}
}
ASSERT(rc <= 0);
if ( rc == 0 )
{
#define XLAT_gnttab_setup_table_HNDL_frame_list(_d_, _s_) \
do \
{ \
if ( (_s_)->status == GNTST_okay ) \
{ \
for ( i = 0; i < (_s_)->nr_frames; ++i ) \
{ \
unsigned int frame = (_s_)->frame_list.p[i]; \
(void)__copy_to_compat_offset((_d_)->frame_list, i, &frame, 1); \
} \
} \
} while (0)
XLAT_gnttab_setup_table(&cmp.setup, nat.setup);
#undef XLAT_gnttab_setup_table_HNDL_frame_list
if ( unlikely(__copy_to_guest(cmp_uop, &cmp.setup, 1)) )
rc = -EFAULT;
else
i = 1;
}
break;
case GNTTABOP_transfer:
for ( n = 0; n < COMPAT_ARG_XLAT_SIZE / sizeof(*nat.xfer) && i < count && rc == 0; ++i, ++n )
{
if ( unlikely(__copy_from_guest_offset(&cmp.xfer, cmp_uop, i, 1)) )
rc = -EFAULT;
else
{
XLAT_gnttab_transfer(nat.xfer + n, &cmp.xfer);
}
}
if ( rc == 0 )
rc = gnttab_transfer(guest_handle_cast(nat.uop, gnttab_transfer_t), n);
if ( rc > 0 )
{
ASSERT(rc < n);
i -= n - rc;
n = rc;
}
if ( rc >= 0 )
{
XEN_GUEST_HANDLE(gnttab_transfer_compat_t) xfer;
xfer = guest_handle_cast(cmp_uop, gnttab_transfer_compat_t);
guest_handle_add_offset(xfer, i);
cnt_uop = guest_handle_cast(xfer, void);
while ( n-- )
{
guest_handle_add_offset(xfer, -1);
if ( __copy_field_to_guest(xfer, nat.xfer + n, status) )
rc = -EFAULT;
}
}
break;
case GNTTABOP_copy:
for ( n = 0; n < COMPAT_ARG_XLAT_SIZE / sizeof(*nat.copy) && i < count && rc == 0; ++i, ++n )
{
if ( unlikely(__copy_from_guest_offset(&cmp.copy, cmp_uop, i, 1)) )
rc = -EFAULT;
else
{
enum XLAT_gnttab_copy_source_u source_u;
enum XLAT_gnttab_copy_dest_u dest_u;
if ( cmp.copy.flags & GNTCOPY_source_gref )
source_u = XLAT_gnttab_copy_source_u_ref;
else
source_u = XLAT_gnttab_copy_source_u_gmfn;
if ( cmp.copy.flags & GNTCOPY_dest_gref )
dest_u = XLAT_gnttab_copy_dest_u_ref;
else
dest_u = XLAT_gnttab_copy_dest_u_gmfn;
XLAT_gnttab_copy(nat.copy + n, &cmp.copy);
}
}
if ( rc == 0 )
rc = gnttab_copy(guest_handle_cast(nat.uop, gnttab_copy_t), n);
if ( rc > 0 )
{
ASSERT(rc < n);
i -= n - rc;
n = rc;
}
if ( rc >= 0 )
{
XEN_GUEST_HANDLE(gnttab_copy_compat_t) copy;
copy = guest_handle_cast(cmp_uop, gnttab_copy_compat_t);
guest_handle_add_offset(copy, i);
cnt_uop = guest_handle_cast(copy, void);
while ( n-- )
{
guest_handle_add_offset(copy, -1);
if ( __copy_field_to_guest(copy, nat.copy + n, status) )
rc = -EFAULT;
}
}
break;
case GNTTABOP_get_status_frames: {
unsigned int max_frame_list_size_in_pages =
(COMPAT_ARG_XLAT_SIZE - sizeof(*nat.get_status)) /
sizeof(*nat.get_status->frame_list.p);
if ( count != 1)
{
rc = -EINVAL;
break;
}
if ( unlikely(__copy_from_guest(&cmp.get_status, cmp_uop, 1) ||
!compat_handle_okay(cmp.get_status.frame_list,
cmp.get_status.nr_frames)) )
{
rc = -EFAULT;
break;
}
if ( max_frame_list_size_in_pages <
grant_to_status_frames(max_nr_grant_frames) )
{
gdprintk(XENLOG_WARNING,
"grant_to_status_frames(max_nr_grant_frames) is too large (%u,%u)\n",
grant_to_status_frames(max_nr_grant_frames),
max_frame_list_size_in_pages);
rc = -EINVAL;
break;
}
#define XLAT_gnttab_get_status_frames_HNDL_frame_list(_d_, _s_) \
set_xen_guest_handle((_d_)->frame_list, (uint64_t *)(nat.get_status + 1))
XLAT_gnttab_get_status_frames(nat.get_status, &cmp.get_status);
#undef XLAT_gnttab_get_status_frames_HNDL_frame_list
rc = gnttab_get_status_frames(
guest_handle_cast(nat.uop, gnttab_get_status_frames_t),
count);
if ( rc >= 0 )
{
#define XLAT_gnttab_get_status_frames_HNDL_frame_list(_d_, _s_) \
do \
{ \
if ( (_s_)->status == GNTST_okay ) \
{ \
for ( i = 0; i < (_s_)->nr_frames; ++i ) \
{ \
uint64_t frame = (_s_)->frame_list.p[i]; \
(void)__copy_to_compat_offset((_d_)->frame_list, i, &frame, 1); \
} \
} \
} while (0)
XLAT_gnttab_get_status_frames(&cmp.get_status, nat.get_status);
#undef XLAT_gnttab_get_status_frames_HNDL_frame_list
if ( unlikely(__copy_to_guest(cmp_uop, &cmp.get_status, 1)) )
rc = -EFAULT;
}
break;
}
default:
domain_crash(current->domain);
break;
}
}
if ( rc > 0 )
{
ASSERT(i < count);
ASSERT(!guest_handle_is_null(cnt_uop));
rc = hypercall_create_continuation(__HYPERVISOR_grant_table_op,
"ihi", cmd, cnt_uop, count - i);
}
return rc;
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|
