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#include <xen/event.h>
#include <xen/multicall.h>
#include <compat/memory.h>
#include <compat/xen.h>
int compat_set_gdt(XEN_GUEST_HANDLE(uint) frame_list, unsigned int entries)
{
unsigned int i, nr_pages = (entries + 511) / 512;
unsigned long frames[16];
long ret;
/* Rechecked in set_gdt, but ensures a sane limit for copy_from_user(). */
if ( entries > FIRST_RESERVED_GDT_ENTRY )
return -EINVAL;
if ( !guest_handle_okay(frame_list, nr_pages) )
return -EFAULT;
for ( i = 0; i < nr_pages; ++i )
{
unsigned int frame;
if ( __copy_from_guest(&frame, frame_list, 1) )
return -EFAULT;
frames[i] = frame;
guest_handle_add_offset(frame_list, 1);
}
domain_lock(current->domain);
if ( (ret = set_gdt(current, frames, entries)) == 0 )
flush_tlb_local();
domain_unlock(current->domain);
return ret;
}
int compat_update_descriptor(u32 pa_lo, u32 pa_hi, u32 desc_lo, u32 desc_hi)
{
return do_update_descriptor(pa_lo | ((u64)pa_hi << 32),
desc_lo | ((u64)desc_hi << 32));
}
int compat_arch_memory_op(int op, XEN_GUEST_HANDLE(void) arg)
{
struct compat_machphys_mfn_list xmml;
l2_pgentry_t l2e;
unsigned long v;
compat_pfn_t mfn;
unsigned int i;
int rc = 0;
switch ( op )
{
case XENMEM_add_to_physmap:
{
struct compat_add_to_physmap cmp;
struct xen_add_to_physmap *nat = COMPAT_ARG_XLAT_VIRT_BASE;
if ( copy_from_guest(&cmp, arg, 1) )
return -EFAULT;
XLAT_add_to_physmap(nat, &cmp);
rc = arch_memory_op(op, guest_handle_from_ptr(nat, void));
break;
}
case XENMEM_set_memory_map:
{
struct compat_foreign_memory_map cmp;
struct xen_foreign_memory_map *nat = COMPAT_ARG_XLAT_VIRT_BASE;
if ( copy_from_guest(&cmp, arg, 1) )
return -EFAULT;
#define XLAT_memory_map_HNDL_buffer(_d_, _s_) \
guest_from_compat_handle((_d_)->buffer, (_s_)->buffer)
XLAT_foreign_memory_map(nat, &cmp);
#undef XLAT_memory_map_HNDL_buffer
rc = arch_memory_op(op, guest_handle_from_ptr(nat, void));
break;
}
case XENMEM_memory_map:
case XENMEM_machine_memory_map:
{
struct compat_memory_map cmp;
struct xen_memory_map *nat = COMPAT_ARG_XLAT_VIRT_BASE;
if ( copy_from_guest(&cmp, arg, 1) )
return -EFAULT;
#define XLAT_memory_map_HNDL_buffer(_d_, _s_) \
guest_from_compat_handle((_d_)->buffer, (_s_)->buffer)
XLAT_memory_map(nat, &cmp);
#undef XLAT_memory_map_HNDL_buffer
rc = arch_memory_op(op, guest_handle_from_ptr(nat, void));
if ( rc < 0 )
break;
#define XLAT_memory_map_HNDL_buffer(_d_, _s_) ((void)0)
XLAT_memory_map(&cmp, nat);
#undef XLAT_memory_map_HNDL_buffer
if ( copy_to_guest(arg, &cmp, 1) )
rc = -EFAULT;
break;
}
case XENMEM_set_pod_target:
case XENMEM_get_pod_target:
{
struct compat_pod_target cmp;
struct xen_pod_target *nat = COMPAT_ARG_XLAT_VIRT_BASE;
if ( copy_from_guest(&cmp, arg, 1) )
return -EFAULT;
XLAT_pod_target(nat, &cmp);
rc = arch_memory_op(op, guest_handle_from_ptr(nat, void));
if ( rc < 0 )
break;
if ( rc == __HYPERVISOR_memory_op )
hypercall_xlat_continuation(NULL, 0x2, nat, arg);
XLAT_pod_target(&cmp, nat);
if ( copy_to_guest(arg, &cmp, 1) )
rc = -EFAULT;
break;
}
case XENMEM_machphys_mapping:
{
struct domain *d = current->domain;
struct compat_machphys_mapping mapping = {
.v_start = MACH2PHYS_COMPAT_VIRT_START(d),
.v_end = MACH2PHYS_COMPAT_VIRT_END,
.max_mfn = MACH2PHYS_COMPAT_NR_ENTRIES(d) - 1
};
if ( copy_to_guest(arg, &mapping, 1) )
rc = -EFAULT;
break;
}
case XENMEM_machphys_mfn_list:
{
unsigned long limit;
compat_pfn_t last_mfn;
if ( copy_from_guest(&xmml, arg, 1) )
return -EFAULT;
limit = (unsigned long)(compat_machine_to_phys_mapping + max_page);
if ( limit > RDWR_COMPAT_MPT_VIRT_END )
limit = RDWR_COMPAT_MPT_VIRT_END;
for ( i = 0, v = RDWR_COMPAT_MPT_VIRT_START, last_mfn = 0;
(i != xmml.max_extents) && (v < limit);
i++, v += 1 << L2_PAGETABLE_SHIFT )
{
l2e = compat_idle_pg_table_l2[l2_table_offset(v)];
if ( l2e_get_flags(l2e) & _PAGE_PRESENT )
mfn = l2e_get_pfn(l2e);
else
mfn = last_mfn;
ASSERT(mfn);
if ( copy_to_compat_offset(xmml.extent_start, i, &mfn, 1) )
return -EFAULT;
last_mfn = mfn;
}
xmml.nr_extents = i;
if ( copy_to_guest(arg, &xmml, 1) )
rc = -EFAULT;
break;
}
default:
rc = -ENOSYS;
break;
}
return rc;
}
int compat_update_va_mapping(unsigned int va, u32 lo, u32 hi,
unsigned int flags)
{
return do_update_va_mapping(va, lo | ((u64)hi << 32), flags);
}
int compat_update_va_mapping_otherdomain(unsigned long va, u32 lo, u32 hi,
unsigned long flags,
domid_t domid)
{
return do_update_va_mapping_otherdomain(va, lo | ((u64)hi << 32), flags, domid);
}
DEFINE_XEN_GUEST_HANDLE(mmuext_op_compat_t);
int compat_mmuext_op(XEN_GUEST_HANDLE(mmuext_op_compat_t) cmp_uops,
unsigned int count,
XEN_GUEST_HANDLE(uint) pdone,
unsigned int foreigndom)
{
unsigned int i, preempt_mask;
int rc = 0;
XEN_GUEST_HANDLE(mmuext_op_t) nat_ops;
if ( unlikely(count == MMU_UPDATE_PREEMPTED) &&
likely(guest_handle_is_null(cmp_uops)) )
{
set_xen_guest_handle(nat_ops, NULL);
return do_mmuext_op(nat_ops, count, pdone, foreigndom);
}
preempt_mask = count & MMU_UPDATE_PREEMPTED;
count ^= preempt_mask;
if ( unlikely(!guest_handle_okay(cmp_uops, count)) )
return -EFAULT;
set_xen_guest_handle(nat_ops, COMPAT_ARG_XLAT_VIRT_BASE);
for ( ; count; count -= i )
{
mmuext_op_t *nat_op = nat_ops.p;
unsigned int limit = COMPAT_ARG_XLAT_SIZE / sizeof(*nat_op);
int err;
for ( i = 0; i < min(limit, count); ++i )
{
mmuext_op_compat_t cmp_op;
enum XLAT_mmuext_op_arg1 arg1;
enum XLAT_mmuext_op_arg2 arg2;
if ( unlikely(__copy_from_guest(&cmp_op, cmp_uops, 1) != 0) )
{
rc = -EFAULT;
break;
}
switch ( cmp_op.cmd )
{
case MMUEXT_PIN_L1_TABLE:
case MMUEXT_PIN_L2_TABLE:
case MMUEXT_PIN_L3_TABLE:
case MMUEXT_PIN_L4_TABLE:
case MMUEXT_UNPIN_TABLE:
case MMUEXT_NEW_BASEPTR:
case MMUEXT_CLEAR_PAGE:
case MMUEXT_COPY_PAGE:
arg1 = XLAT_mmuext_op_arg1_mfn;
break;
default:
arg1 = XLAT_mmuext_op_arg1_linear_addr;
break;
case MMUEXT_NEW_USER_BASEPTR:
rc = -EINVAL;
case MMUEXT_TLB_FLUSH_LOCAL:
case MMUEXT_TLB_FLUSH_MULTI:
case MMUEXT_TLB_FLUSH_ALL:
case MMUEXT_FLUSH_CACHE:
arg1 = -1;
break;
}
if ( rc )
break;
switch ( cmp_op.cmd )
{
case MMUEXT_SET_LDT:
arg2 = XLAT_mmuext_op_arg2_nr_ents;
break;
case MMUEXT_TLB_FLUSH_MULTI:
case MMUEXT_INVLPG_MULTI:
arg2 = XLAT_mmuext_op_arg2_vcpumask;
break;
case MMUEXT_COPY_PAGE:
arg2 = XLAT_mmuext_op_arg2_src_mfn;
break;
default:
arg2 = -1;
break;
}
#define XLAT_mmuext_op_HNDL_arg2_vcpumask(_d_, _s_) \
guest_from_compat_handle((_d_)->arg2.vcpumask, (_s_)->arg2.vcpumask)
XLAT_mmuext_op(nat_op, &cmp_op);
#undef XLAT_mmuext_op_HNDL_arg2_vcpumask
if ( rc || i >= limit )
break;
guest_handle_add_offset(cmp_uops, 1);
++nat_op;
}
err = do_mmuext_op(nat_ops, i | preempt_mask, pdone, foreigndom);
if ( err )
{
BUILD_BUG_ON(__HYPERVISOR_mmuext_op <= 0);
if ( err == __HYPERVISOR_mmuext_op )
{
struct cpu_user_regs *regs = guest_cpu_user_regs();
struct mc_state *mcs = ¤t->mc_state;
unsigned int arg1 = !test_bit(_MCSF_in_multicall, &mcs->flags)
? regs->ecx
: mcs->call.args[1];
unsigned int left = arg1 & ~MMU_UPDATE_PREEMPTED;
BUG_ON(left == arg1 && left != i);
BUG_ON(left > count);
guest_handle_add_offset(nat_ops, i - left);
guest_handle_subtract_offset(cmp_uops, left);
left = 1;
if ( arg1 != MMU_UPDATE_PREEMPTED )
{
BUG_ON(!hypercall_xlat_continuation(&left, 0x01, nat_ops,
cmp_uops));
if ( !test_bit(_MCSF_in_multicall, &mcs->flags) )
regs->_ecx += count - i;
else
mcs->compat_call.args[1] += count - i;
}
else
BUG_ON(hypercall_xlat_continuation(&left, 0));
BUG_ON(left != arg1);
}
else
BUG_ON(err > 0);
rc = err;
}
if ( rc )
break;
/* Force do_mmuext_op() to not start counting from zero again. */
preempt_mask = MMU_UPDATE_PREEMPTED;
}
return rc;
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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