ia64/xen-unstable

changeset 17440:115a1720e976

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x86/64 compat: Replace hypervisor BUG_ON() with a cleaner hypercall failure.

While trying to run a 32-bit PV domU on a 64-bit hypervisor, I
triggered an assert in the hypervisor. The assert dealt with the
maximum number of grants that a domU can have. I made the hypervisor
a bit more graceful by returning an error rather than asserting.

Signed-off-by: Michael Abd-El-Malek <mabdelmalek@cmu.edu>
author Keir Fraser <keir.fraser@citrix.com>
date Fri Apr 11 09:10:58 2008 +0100 (2008-04-11)
parents bde269270d9a
children 1ce8b4e51911
files xen/common/compat/grant_table.c
line diff
     1.1 --- a/xen/common/compat/grant_table.c	Fri Apr 11 09:07:58 2008 +0100
     1.2 +++ b/xen/common/compat/grant_table.c	Fri Apr 11 09:10:58 2008 +0100
     1.3 @@ -109,12 +109,24 @@ int compat_grant_table_op(unsigned int c
     1.4                  rc = -EFAULT;
     1.5              else
     1.6              {
     1.7 -                BUG_ON((COMPAT_ARG_XLAT_SIZE - sizeof(*nat.setup)) / sizeof(*nat.setup->frame_list.p) < max_nr_grant_frames);
     1.8 +                unsigned int max_frame_list_size_in_page =
     1.9 +                    (COMPAT_ARG_XLAT_SIZE - sizeof(*nat.setup)) /
    1.10 +                    sizeof(*nat.setup->frame_list.p);
    1.11 +                if ( max_frame_list_size_in_page < max_nr_grant_frames )
    1.12 +                {
    1.13 +                    gdprintk(XENLOG_WARNING,
    1.14 +                             "max_nr_grant_frames is too large (%u,%u)\n",
    1.15 +                             max_nr_grant_frames, max_frame_list_size_in_page);
    1.16 +                    rc = -EINVAL;
    1.17 +                }
    1.18 +                else
    1.19 +                {
    1.20  #define XLAT_gnttab_setup_table_HNDL_frame_list(_d_, _s_) \
    1.21 -                set_xen_guest_handle((_d_)->frame_list, (unsigned long *)(nat.setup + 1))
    1.22 -                XLAT_gnttab_setup_table(nat.setup, &cmp.setup);
    1.23 +                    set_xen_guest_handle((_d_)->frame_list, (unsigned long *)(nat.setup + 1))
    1.24 +                    XLAT_gnttab_setup_table(nat.setup, &cmp.setup);
    1.25  #undef XLAT_gnttab_setup_table_HNDL_frame_list
    1.26 -                rc = gnttab_setup_table(guest_handle_cast(nat.uop, gnttab_setup_table_t), 1);
    1.27 +                    rc = gnttab_setup_table(guest_handle_cast(nat.uop, gnttab_setup_table_t), 1);
    1.28 +                }
    1.29              }
    1.30              if ( rc == 0 )
    1.31              {