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* tests/ioctl_kvm_run.c [!HAVE_STRUCT_KVM_CPUID2]: Skip the test.
(KVM_MAX_CPUID_ENTRIES): New macro.
(print_cpuid_ioctl): New function.
(main): Add tests for cpuid related ioctl.
Signed-off-by: Pierre Marsais <pierre.marsais@lse.epita.fr>
Since Linux 4.16, kernel appends the cpuid as suffix to the entry
for a kvm vcpu in /proc/$pid/fd like:
anon_inode:kvm-vcpu:0
That was
anon_inode:kvm-vcpu
This kernel change causes the test case failure on newer kernels.
Update the test to deal with the new name as well as the old one.
* tests/ioctl_kvm_run.c: Include unistd.h for using readlink(2).
(vcpu_dev_should_have_cpuid): New function for detecting whether
a proc entry for given fd has the cpuid suffix or not.
(main): Trim vcpu_dev to remove the cpuid suffix if needed.
(vcpu_dev): Remove const modifier.
When built with -O0, gcc (rightfully) generates function prologue, which
results in writing %rbp to the stack, causing premature KVM_EXIT_MMIO.
It could be possible to avoid such problems by "naked" attribute but,
unfortunately, the latter is not available on x86 with older GCC.
A trick suggested in [1] is used instead: assembly is moved
to the global scope.
[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50242#c3
* tests/ioctl_kvm_run.c (code): Remove function.
Add globally scoped __asm__ with the function code and its size.
(code, code_size): New extern symbols declarations.
(run_kvm): Remove code_size definition and initialization.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
As it has proven itself useful.
* tests/ioctl_kvm_run.c (run_kvm) <case KVM_EXIT_MMIO:>: Fail
on unexpected KVM_EXIT_MMIO, providing relevant diagnostics.
