KVM: Fix coalesced_mmio_has_room() to avoid premature userspace exit

The following calculation used in coalesced_mmio_has_room() to check
whether the ring buffer is full is wrong and results in premature exits if
the start of the valid entries is in the first half of the ring buffer.

  avail = (ring->first - last - 1) % KVM_COALESCED_MMIO_MAX;
  if (avail == 0)
	  /* full */

Because negative values are handled using two's complement, and KVM
computes the result as an unsigned value, the above will get a false
positive if "first < last" and the ring is half-full.

The above might have worked as expected in python for example:
  >>> (-86) % 170
  84

However it doesn't work the same way in C.

  printf("avail: %d\n", (-86) % 170);
  printf("avail: %u\n", (-86) % 170);
  printf("avail: %u\n", (-86u) % 170u);

Using gcc-11 these print:

  avail: -86
  avail: 4294967210
  avail: 0

For illustration purposes, given a 4-bit integer and a ring size of 0xA
(unsigned), 0xA == 0x1010 == -6, and thus (-6u % 0xA) == 0.

Fix the calculation and allow all but one entries in the buffer to be
used as originally intended.

Note, KVM's behavior is self-healing to some extent, as KVM will allow the
entire buffer to be used if ring->first is beyond the halfway point.  In
other words, in the unlikely scenario that a use case benefits from being
able to coalesce more than 86 entries at once, KVM will still provide such
behavior, sometimes.

Note #2, the % operator in C is not the modulo operator but the remainder
operator. Modulo and remainder operators differ with respect to negative
values.  But, the relevant values in KVM are all unsigned, so it's a moot
point in this case anyway.

Note #3, this is almost a pure revert of the buggy commit, plus a
READ_ONCE() to provide additional safety.  Thue buggy commit justified the
change with "it paves the way for making this function lockless", but it's
not at all clear what was intended, nor is there any evidence that the
buggy code was somehow safer.  (a) the fields in question were already
accessed locklessly, from the perspective that they could be modified by
userspace at any time, and (b) the lock guarding the ring itself was
changed, but never dropped, i.e. whatever lockless scheme (SRCU?) was
planned never landed.

Fixes: 105f8d40a7 ("KVM: Calculate available entries in coalesced mmio ring")
Signed-off-by: Ilias Stamatis <ilstam@amazon.com>
Reviewed-by: Paul Durrant <paul@xen.org>
Link: https://lore.kernel.org/r/20240718193543.624039-2-ilstam@amazon.com
[sean: rework changelog to clarify behavior, call out weirdness of buggy commit]
Signed-off-by: Sean Christopherson <seanjc@google.com>

virt/kvm/coalesced_mmio.c

@@ -43,7 +43,6 @@ static int coalesced_mmio_in_range(struct kvm_coalesced_mmio_dev *dev,
 static int coalesced_mmio_has_room(struct kvm_coalesced_mmio_dev *dev, u32 last)
 {
 	struct kvm_coalesced_mmio_ring *ring;
-	unsigned avail;
 
 	/* Are we able to batch it ? */
 
@@ -52,8 +51,7 @@ static int coalesced_mmio_has_room(struct kvm_coalesced_mmio_dev *dev, u32 last)
 	 * there is always one unused entry in the buffer
 	 */
 	ring = dev->kvm->coalesced_mmio_ring;
-	avail = (ring->first - last - 1) % KVM_COALESCED_MMIO_MAX;
-	if (avail == 0) {
+	if ((last + 1) % KVM_COALESCED_MMIO_MAX == READ_ONCE(ring->first)) {
 		/* full */
 		return 0;
 	}