Hi Drew,
On Tue, Sep 18, 2018 at 07:54:23PM +0200, Andrew Jones wrote:
> This series provides KVM selftests that test dirty log tracking on
> AArch64 for both 4K and 64K guest page sizes. Additionally the
> framework provides an easy way to test dirty log tracking with the
> recently posted dynamic IPA and 52bit IPA series[1].
I was trying to parse the commit text of patch 2, and I realized that I
don't understand the 'hypercall to userspace' thing at all, which
probably means I have no idea how the selftests work overall.
I then spent a while reading various bits of documentation in the kernel
tree, LWN, etc., only to realize that I don't understand how this test
framework actually works.
Are the selftests modules, userspace programs, or code that is compiled
with the kernel, and (somehow?) run from userspace. I thought the
latter, partially based on your explanation at ELC, but then I don't
understand how the "compile and run" make target works.
Can you help me paint the overall picture, or point me to the piece of
documentation/presentation that explains the high-level picture, which I
must have obviously missed somehow?
Thanks!
Christoffer
>
> The series breaks down into parts as follows:
>
> 01-02: generalize guest code to host userspace exit support by
> introducing "ucalls" - hypercalls to userspace
> 03-05: prepare common code for a new architecture
> 06-07: add virtual memory setup support for AArch64
> 08: add vcpu setup support for AArch64
> 09: port the dirty log test to AArch64
> 10-11: add 64K guest page size support for the dirty log test
> 12-13: prepare the dirty log test to also test > 40-bit guest
> physical address setups by allowing the test memory
> region to be placed at the top of physical memory
>
> [1] https://www.spinics.net/lists/arm-kernel/msg676819.html
>
> Thanks,
> drew
>
>
> Andrew Jones (13):
> kvm: selftests: vcpu_setup: set cr4.osfxsr
> kvm: selftests: introduce ucall
> kvm: selftests: move arch-specific files to arch-specific locations
> kvm: selftests: add cscope make target
> kvm: selftests: tidy up kvm_util
> kvm: selftests: add vm_phy_pages_alloc
> kvm: selftests: add virt mem support for aarch64
> kvm: selftests: add vcpu support for aarch64
> kvm: selftests: port dirty_log_test to aarch64
> kvm: selftests: introduce new VM mode for 64K pages
> kvm: selftests: dirty_log_test: also test 64K pages on aarch64
> kvm: selftests: stop lying to aarch64 tests about PA-bits
> kvm: selftests: support high GPAs in dirty_log_test
>
> tools/testing/selftests/kvm/.gitignore | 11 +-
> tools/testing/selftests/kvm/Makefile | 36 +-
> tools/testing/selftests/kvm/dirty_log_test.c | 374 +++++++++----
> .../selftests/kvm/include/aarch64/processor.h | 55 ++
> .../testing/selftests/kvm/include/kvm_util.h | 166 +++---
> .../testing/selftests/kvm/include/sparsebit.h | 6 +-
> .../testing/selftests/kvm/include/test_util.h | 6 +-
> .../kvm/include/{x86.h => x86_64/processor.h} | 24 +-
> .../selftests/kvm/include/{ => x86_64}/vmx.h | 6 +-
> .../selftests/kvm/lib/aarch64/processor.c | 311 +++++++++++
> tools/testing/selftests/kvm/lib/assert.c | 2 +-
> tools/testing/selftests/kvm/lib/kvm_util.c | 499 +++++++-----------
> .../selftests/kvm/lib/kvm_util_internal.h | 33 +-
> tools/testing/selftests/kvm/lib/ucall.c | 144 +++++
> .../kvm/lib/{x86.c => x86_64/processor.c} | 197 ++++++-
> .../selftests/kvm/lib/{ => x86_64}/vmx.c | 4 +-
> .../kvm/{ => x86_64}/cr4_cpuid_sync_test.c | 14 +-
> .../kvm/{ => x86_64}/set_sregs_test.c | 2 +-
> .../selftests/kvm/{ => x86_64}/state_test.c | 25 +-
> .../kvm/{ => x86_64}/sync_regs_test.c | 2 +-
> .../kvm/{ => x86_64}/vmx_tsc_adjust_test.c | 23 +-
> 21 files changed, 1329 insertions(+), 611 deletions(-)
> create mode 100644 tools/testing/selftests/kvm/include/aarch64/processor.h
> rename tools/testing/selftests/kvm/include/{x86.h => x86_64/processor.h}
> (98%)
> rename tools/testing/selftests/kvm/include/{ => x86_64}/vmx.h (99%)
> create mode 100644 tools/testing/selftests/kvm/lib/aarch64/processor.c
> create mode 100644 tools/testing/selftests/kvm/lib/ucall.c
> rename tools/testing/selftests/kvm/lib/{x86.c => x86_64/processor.c} (85%)
> rename tools/testing/selftests/kvm/lib/{ => x86_64}/vmx.c (99%)
> rename tools/testing/selftests/kvm/{ => x86_64}/cr4_cpuid_sync_test.c (91%)
> rename tools/testing/selftests/kvm/{ => x86_64}/set_sregs_test.c (98%)
> rename tools/testing/selftests/kvm/{ => x86_64}/state_test.c (90%)
> rename tools/testing/selftests/kvm/{ => x86_64}/sync_regs_test.c (99%)
> rename tools/testing/selftests/kvm/{ => x86_64}/vmx_tsc_adjust_test.c (91%)
>
> --
> 2.17.1
>
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