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a11d7124b4
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@google.com> Cc: Gavin Shan <gshan@redhat.com> Cc: Shivank Garg <shivankg@amd.com> Co-developed-by: Ackerley Tng <ackerleytng@google.com> Signed-off-by: Ackerley Tng <ackerleytng@google.com> Signed-off-by: Fuad Tabba <tabba@google.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Message-ID: <20250729225455.670324-24-seanjc@google.com> [Fix default vm_types to use BIT() - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.