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Not having these results in three copies of every KVM-related #define
in each reproducer.
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Add #if checks to define executor_fn_guest_addr() for
__NR_syz_kvm_setup_cpu and __NR_syz_kvm_setup_syzos_vm.
This fixes a compilation error spotted by csource_test.go
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Apply __addrspace_guest to every guest function and use a C++ template
to statically validate that host functions are not passed to
executor_fn_guest_addr().
This only works in Clang builds of syz-executor, because GCC does not
support address spaces, and C reproducers cannot use templates.
The static check allows us to drop the dynamic checks in DEFINE_GUEST_FN_TO_GPA_FN().
While at it, replace DEFINE_GUEST_FN_TO_GPA_FN() with explicit declarations of
host_fn_guest_addr() and guest_fn_guest_addr().
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DEFINE_GUEST_FN_TO_GPA_FN() allows to define helper functions to
calculate guest addresses in the host/guest code.
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Implement a pseudo-syscall to check the value of kvm_run.exit_reason
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1. Basic support for arm64 kvm testing.
2. Fix compiler warnings in x86 kvm code.
3. Test all pseudo syz calls in csource.
4. Fix handling of real code in x86.
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Add new pseudo syscall syz_kvm_setup_cpu that setups VCPU into
interesting states for execution. KVM is too difficult to setup otherwise.
Lots of improvements possible, but this is a starting point.
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