On 7/30/2025 4:24 AM, Sean Christopherson wrote: > From: Fuad Tabba <tabba@xxxxxxxxxx> > > Expand the guest_memfd selftests to comprehensively test host userspace > mmap functionality for guest_memfd-backed memory when supported by the > VM type. > > Introduce new test cases to verify the following: > > * Successful mmap operations: Ensure that MAP_SHARED mappings succeed > when guest_memfd mmap is enabled. > > * Data integrity: Validate that data written to the mmap'd region is > correctly persistent and readable. > > * fallocate interaction: Test that fallocate(FALLOC_FL_PUNCH_HOLE) > correctly zeros out mapped pages. > > * Out-of-bounds access: Verify that accessing memory beyond the > guest_memfd's size correctly triggers a SIGBUS signal. > > * Unsupported mmap: Confirm that mmap attempts fail as expected when > guest_memfd mmap support is not enabled for the specific guest_memfd > instance or VM type. > > * Flag validity: Introduce test_vm_type_gmem_flag_validity() to > systematically test that only allowed guest_memfd creation flags are > accepted for different VM types (e.g., GUEST_MEMFD_FLAG_MMAP for > default VMs, no flags for CoCo VMs). > > The existing tests for guest_memfd creation (multiple instances, invalid > sizes), file read/write, file size, and invalid punch hole operations > are integrated into the new test_with_type() framework to allow testing > across different VM types. > > Cc: James Houghton <jthoughton@xxxxxxxxxx> > Cc: Gavin Shan <gshan@xxxxxxxxxx> > Cc: Shivank Garg <shivankg@xxxxxxx> > Co-developed-by: Ackerley Tng <ackerleytng@xxxxxxxxxx> > Signed-off-by: Ackerley Tng <ackerleytng@xxxxxxxxxx> > Signed-off-by: Fuad Tabba <tabba@xxxxxxxxxx> > Co-developed-by: Sean Christopherson <seanjc@xxxxxxxxxx> > Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx> > --- > .../testing/selftests/kvm/guest_memfd_test.c | 161 +++++++++++++++--- > 1 file changed, 139 insertions(+), 22 deletions(-) > Reviewed-by: Shivank Garg <shivankg@xxxxxxx>
