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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.
extern char *__start_guest, *__stop_guest;
// Define a function that calculates the guest physical address for a guest function.
// Execute failure_action if the function does not belong to the guest section.
// This function is using volatile accesses, otherwise the compiler may attempt
// to store e.g. &__start_guest + offset as a constant in .rodata.
#define DEFINE_GUEST_FN_TO_GPA_FN(fn_name, offset, failure_action) \
static inline uintptr_t fn_name(uintptr_t f) \
{ \
volatile uintptr_t start = (uintptr_t)&__start_guest; \
volatile uintptr_t stop = (uintptr_t)&__stop_guest; \
if (f >= start && f < stop) { \
return f - start + (offset); \
} \
(failure_action); \
return 0; \
}
#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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