linux.git/tools/testing/selftests/kvm/Makefile, branch v6.9

selftests: kvm: remove meaningless assignments in Makefiles

2024-03-15T10:52:55+00:00

$(shell ...) expands to the output of the command. It expands to the
empty string when the command does not print anything to stdout.
Hence, $(shell mkdir ...) is sufficient and does not need any
variable assignment in front of it.

Commit c2bd08ba20a5 ("treewide: remove meaningless assignments in
Makefiles", 2024-02-23) did this to all of tools/ but ignored in-flight
changes to tools/testing/selftests/kvm/Makefile, so reapply the change.

Cc: Masahiro Yamada 
Signed-off-by: Paolo Bonzini

Merge tag 'kvm-x86-pmu-6.9' of https://github.com/kvm-x86/linux into HEAD

2024-03-11T14:41:09+00:00

KVM x86 PMU changes for 6.9:

 - Fix several bugs where KVM speciously prevents the guest from utilizing
   fixed counters and architectural event encodings based on whether or not
   guest CPUID reports support for the _architectural_ encoding.

 - Fix a variety of bugs in KVM's emulation of RDPMC, e.g. for "fast" reads,
   priority of VMX interception vs #GP, PMC types in architectural PMUs, etc.

 - Add a selftest to verify KVM correctly emulates RDMPC, counter availability,
   and a variety of other PMC-related behaviors that depend on guest CPUID,
   i.e. are difficult to validate via KVM-Unit-Tests.

 - Zero out PMU metadata on AMD if the virtual PMU is disabled to avoid wasting
   cycles, e.g. when checking if a PMC event needs to be synthesized when
   skipping an instruction.

 - Optimize triggering of emulated events, e.g. for "count instructions" events
   when skipping an instruction, which yields a ~10% performance improvement in
   VM-Exit microbenchmarks when a vPMU is exposed to the guest.

 - Tighten the check for "PMI in guest" to reduce false positives if an NMI
   arrives in the host while KVM is handling an IRQ VM-Exit.

Merge tag 'kvm-x86-selftests-6.9' of https://github.com/kvm-x86/linux into HEAD

2024-03-11T14:20:35+00:00

KVM selftests changes for 6.9:

 - Add macros to reduce the amount of boilerplate code needed to write "simple"
   selftests, and to utilize selftest TAP infrastructure, which is especially
   beneficial for KVM selftests with multiple testcases.

 - Add basic smoke tests for SEV and SEV-ES, along with a pile of library
   support for handling private/encrypted/protected memory.

 - Fix benign bugs where tests neglect to close() guest_memfd files.

KVM: riscv: selftests: Add sstc timer test

2024-03-06T15:23:29+00:00

Add a KVM selftests to validate the Sstc timer functionality.
The test was ported from arm64 arch timer test.

Signed-off-by: Haibo Xu 
Reviewed-by: Andrew Jones 
Signed-off-by: Anup Patel

KVM: riscv: selftests: Add exception handling support

2024-03-06T15:21:41+00:00

Add the infrastructure for guest exception handling in riscv selftests.
Customized handlers can be enabled by vm_install_exception_handler(vector)
or vm_install_interrupt_handler().

The code is inspired from that of x86/arm64.

Signed-off-by: Haibo Xu 
Reviewed-by: Andrew Jones 
Signed-off-by: Anup Patel

KVM: selftests: Add a basic SEV smoke test

2024-02-29T00:39:54+00:00

Add a basic smoke test for SEV guests to verify that KVM can launch an
SEV guest and run a few instructions without exploding.  To verify that
SEV is indeed enabled, assert that SEV is reported as enabled in
MSR_AMD64_SEV, a.k.a. SEV_STATUS, which cannot be intercepted by KVM
(architecturally enforced).

Cc: Paolo Bonzini 
Cc: Sean Christopherson 
Cc: Vishal Annapurve 
Cc: Ackerly Tng 
cc: Andrew Jones 
Cc: Tom Lendacky 
Cc: Michael Roth 
Suggested-by: Michael Roth 
Tested-by: Carlos Bilbao 
Signed-off-by: Peter Gonda 
[sean: rename to "sev_smoke_test"]
Link: https://lore.kernel.org/r/20240223004258.3104051-11-seanjc@google.com
Signed-off-by: Sean Christopherson

KVM: selftests: Add library for creating and interacting with SEV guests

2024-02-29T00:39:52+00:00

Add a library/APIs for creating and interfacing with SEV guests, all of
which need some amount of common functionality, e.g. an open file handle
for the SEV driver (/dev/sev), ioctl() wrappers to pass said file handle
to KVM, tracking of the C-bit, etc.

Add an x86-specific hook to initialize address properties, a.k.a. the
location of the C-bit.  An arch specific hook is rather gross, but x86
already has a dedicated #ifdef-protected kvm_get_cpu_address_width() hook,
i.e. the ugliest code already exists.

Cc: Paolo Bonzini 
Cc: Sean Christopherson 
Cc: Vishal Annapurve 
Cc: Ackerly Tng 
cc: Andrew Jones 
Cc: Tom Lendacky 
Cc: Michael Roth 
Tested-by: Carlos Bilbao 
Originally-by: Michael Roth 
Signed-off-by: Peter Gonda 
Co-developed-by: Sean Christopherson 
Link: https://lore.kernel.org/r/20240223004258.3104051-9-seanjc@google.com
Signed-off-by: Sean Christopherson

KVM: selftests: Add CONFIG_64BIT definition for the build

2024-02-26T04:44:00+00:00

Since only 64bit KVM selftests were supported on all architectures,
add the CONFIG_64BIT definition in kvm/Makefile to ensure only 64bit
definitions were available in the corresponding included files.

Suggested-by: Andrew Jones 
Signed-off-by: Haibo Xu 
Reviewed-by: Andrew Jones 
Signed-off-by: Anup Patel

KVM: arm64: selftests: Split arch_timer test code

2024-02-26T04:43:58+00:00

Split the arch-neutral test code out of aarch64/arch_timer.c
and put them into a common arch_timer.c. This is a preparation
to share timer test codes in riscv.

Suggested-by: Andrew Jones 
Signed-off-by: Haibo Xu 
Reviewed-by: Andrew Jones 
Signed-off-by: Anup Patel

selftests/kvm: Fix issues with $(SPLIT_TESTS)

2024-02-26T04:43:53+00:00

The introduction of $(SPLIT_TESTS) also introduced a warning when
building selftests on architectures that include get-reg-lists:

    make: Entering directory '/root/kvm/tools/testing/selftests/kvm'
    Makefile:272: warning: overriding recipe for target '/root/kvm/tools/testing/selftests/kvm/get-reg-list'
    Makefile:267: warning: ignoring old recipe for target '/root/kvm/tools/testing/selftests/kvm/get-reg-list'
    make: Leaving directory '/root/kvm/tools/testing/selftests/kvm'

In addition, the rule for $(SPLIT_TESTS_TARGETS) includes _all_
the $(SPLIT_TESTS_OBJS), which only works because there is just one.
So fix both by adjusting the rules:

- remove $(SPLIT_TESTS_TARGETS) from the $(TEST_GEN_PROGS) rules,
  and rename it to $(SPLIT_TEST_GEN_PROGS)

- fix $(SPLIT_TESTS_OBJS) so that it plays well with $(OUTPUT),
  rename it to $(SPLIT_TEST_GEN_OBJ), and list the object file
  explicitly in the $(SPLIT_TEST_GEN_PROGS) link rule

Fixes: 17da79e009c3 ("KVM: arm64: selftests: Split get-reg-list test code", 2023-08-09)
Signed-off-by: Paolo Bonzini 
Tested-by: Andrew Jones 
Reviewed-by: Marc Zyngier 
Signed-off-by: Anup Patel