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qxl: factor out qxl_get_check_slot_offset 

New helper function which translates a qxl physical address into
memory slot and offset.  Also applies sanity checks.  Factored out
from qxl_phys2virt.  No functional change.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1466597244-5938-1-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2016-06-22 14:07:22 +02:00
parent 2f5ae772c6
commit 726bdf653a
1 changed files with 38 additions and 21 deletions
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33
hw/display/qxl.c
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@ -1338,36 +1338,53 @@ static void qxl_reset_surfaces(PCIQXLDevice *d)
} }
/* can be also called from spice server thread context */ /* can be also called from spice server thread context */
void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL pqxl, int group_id) static bool qxl_get_check_slot_offset(PCIQXLDevice *qxl, QXLPHYSICAL pqxl,
uint32_t *s, uint64_t *o)
{ {
uint64_t phys = le64_to_cpu(pqxl); uint64_t phys = le64_to_cpu(pqxl);
uint32_t slot = (phys >> (64 - 8)) & 0xff; uint32_t slot = (phys >> (64 - 8)) & 0xff;
uint64_t offset = phys & 0xffffffffffff; uint64_t offset = phys & 0xffffffffffff;
switch (group_id) {
case MEMSLOT_GROUP_HOST:
return (void *)(intptr_t)offset;
case MEMSLOT_GROUP_GUEST:
if (slot >= NUM_MEMSLOTS) { if (slot >= NUM_MEMSLOTS) {
qxl_set_guest_bug(qxl, "slot too large %d >= %d", slot, qxl_set_guest_bug(qxl, "slot too large %d >= %d", slot,
NUM_MEMSLOTS); NUM_MEMSLOTS);
return NULL; return false;
} }
if (!qxl->guest_slots[slot].active) { if (!qxl->guest_slots[slot].active) {
qxl_set_guest_bug(qxl, "inactive slot %d\n", slot); qxl_set_guest_bug(qxl, "inactive slot %d\n", slot);
return NULL; return false;
} }
if (offset < qxl->guest_slots[slot].delta) { if (offset < qxl->guest_slots[slot].delta) {
qxl_set_guest_bug(qxl, qxl_set_guest_bug(qxl,
"slot %d offset %"PRIu64" < delta %"PRIu64"\n", "slot %d offset %"PRIu64" < delta %"PRIu64"\n",
slot, offset, qxl->guest_slots[slot].delta); slot, offset, qxl->guest_slots[slot].delta);
return NULL; return false;
} }
offset -= qxl->guest_slots[slot].delta; offset -= qxl->guest_slots[slot].delta;
if (offset > qxl->guest_slots[slot].size) { if (offset > qxl->guest_slots[slot].size) {
qxl_set_guest_bug(qxl, qxl_set_guest_bug(qxl,
"slot %d offset %"PRIu64" > size %"PRIu64"\n", "slot %d offset %"PRIu64" > size %"PRIu64"\n",
slot, offset, qxl->guest_slots[slot].size); slot, offset, qxl->guest_slots[slot].size);
return false;
}
*s = slot;
*o = offset;
return true;
}
/* can be also called from spice server thread context */
void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL pqxl, int group_id)
{
uint64_t offset;
uint32_t slot;
switch (group_id) {
case MEMSLOT_GROUP_HOST:
offset = le64_to_cpu(pqxl) & 0xffffffffffff;
return (void *)(intptr_t)offset;
case MEMSLOT_GROUP_GUEST:
if (!qxl_get_check_slot_offset(qxl, pqxl, &slot, &offset)) {
return NULL; return NULL;
} }
return qxl->guest_slots[slot].ptr + offset; return qxl->guest_slots[slot].ptr + offset;