[0/2] KVM: Coalesced IO cleanup and test

Message

Sean Christopherson Aug. 23, 2024, 7:13 p.m. UTC

Add a regression test for the bug fixed by commit 92f6d4130497 ("KVM:
Fix coalesced_mmio_has_room() to avoid premature userspace exit"), and
then do additional clean up on the offending KVM code.  I wrote the test
mainly so that I was confident I actually understood Ilias' fix.

This applies on the aforementioned commit, which is sitting in
kvm-x86/generic.

Fully tested on x86 and arm64, compile tested on RISC-V.

Sean Christopherson (2):
  KVM: selftests: Add a test for coalesced MMIO (and PIO on x86)
  KVM: Clean up coalesced MMIO ring full check

 tools/testing/selftests/kvm/Makefile          |   3 +
 .../testing/selftests/kvm/coalesced_io_test.c | 202 ++++++++++++++++++
 .../testing/selftests/kvm/include/kvm_util.h  |  26 +++
 virt/kvm/coalesced_mmio.c                     |  29 +--
 4 files changed, 239 insertions(+), 21 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/coalesced_io_test.c


base-commit: 728d17c2cb8cc5f9ac899173d0e9a67fb8887622