/* This is called just after a mm has been created, but it has not
been used yet. We need to make sure that its pagetable is all
read-only, and can be pinned. */
void xen_pgd_pin(pgd_t *pgd)
{
struct multicall_space mcs;
struct mmuext_op *op;
xen_mc_batch();
if (pgd_walk(pgd, pin_page, TASK_SIZE)) {
/* re-enable interrupts for kmap_flush_unused */
xen_mc_issue(0);
kmap_flush_unused();
xen_mc_batch();
}
mcs = __xen_mc_entry(sizeof(*op));
op = mcs.args;
#ifdef CONFIG_X86_PAE
op->cmd = MMUEXT_PIN_L3_TABLE;
#else
op->cmd = MMUEXT_PIN_L2_TABLE;
#endif
op->arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(pgd)));
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(0);
}
static void xen_set_ldt(const void *addr, unsigned entries)
{
struct mmuext_op *op;
struct multicall_space mcs = xen_mc_entry(sizeof(*op));
op = mcs.args;
op->cmd = MMUEXT_SET_LDT;
op->arg1.linear_addr = (unsigned long)addr;
op->arg2.nr_ents = entries;
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
xen_mc_issue(PARAVIRT_LAZY_CPU);
}
static void xen_extend_mmuext_op(const struct mmuext_op *op)
{
struct multicall_space mcs;
struct mmuext_op *u;
mcs = xen_mc_extend_args(__HYPERVISOR_mmuext_op, sizeof(*u));
if (mcs.mc != NULL) {
mcs.mc->args[1]++;
} else {
mcs = __xen_mc_entry(sizeof(*u));
MULTI_mmuext_op(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
}
u = mcs.args;
*u = *op;
}
/* Release a pagetables pages back as normal RW */
static void xen_pgd_unpin(pgd_t *pgd)
{
struct mmuext_op *op;
struct multicall_space mcs;
xen_mc_batch();
mcs = __xen_mc_entry(sizeof(*op));
op = mcs.args;
op->cmd = MMUEXT_UNPIN_TABLE;
op->arg1.mfn = pfn_to_mfn(PFN_DOWN(__pa(pgd)));
MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
pgd_walk(pgd, unpin_page, TASK_SIZE);
xen_mc_issue(0);
}
