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// Copyright 2025 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
// This file is shared between executor and csource package.
// Common KVM-related definitions.
#include "common_kvm_syzos.h"
#include "kvm.h"
#if SYZ_EXECUTOR || __NR_syz_kvm_add_vcpu
extern char* __start_guest;
// executor_fn_guest_addr() is compiled into both the host and the guest code.
static inline uintptr_t executor_fn_guest_addr(void* fn)
{
// Prevent the compiler from creating a .rodata constant for
// &__start_guest + SYZOS_ADDR_EXECUTOR_CODE.
volatile uintptr_t start = (uintptr_t)&__start_guest;
volatile uintptr_t offset = SYZOS_ADDR_EXECUTOR_CODE;
return (uintptr_t)fn - start + offset;
}
#if SYZ_EXECUTOR
// In Clang-based C++ builds, use template magic to ensure that only guest functions can be passed
// to executor_fn_guest_addr().
template <typename R, typename... A>
uintptr_t static inline executor_fn_guest_addr(__addrspace_guest R (*fn)(A...))
{
return executor_fn_guest_addr((void*)fn);
}
#endif
#endif
#if SYZ_EXECUTOR || __NR_syz_kvm_assert_syzos_kvm_exit
static long syz_kvm_assert_syzos_kvm_exit(volatile long a0, volatile long a1)
{
struct kvm_run* run = (struct kvm_run*)a0;
uint64 expect = a1;
if (!run) {
errno = EINVAL;
return -1;
}
if (run->exit_reason != expect) {
errno = EDOM;
return -1;
}
return 0;
}
#endif
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