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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef SELFTEST_KVM_FLDS_EMULATION_H
#define SELFTEST_KVM_FLDS_EMULATION_H
#include "kvm_util.h"
#define FLDS_MEM_EAX ".byte 0xd9, 0x00"
/*
* flds is an instruction that the KVM instruction emulator is known not to
* support. This can be used in guest code along with a mechanism to force
* KVM to emulate the instruction (e.g. by providing an MMIO address) to
* exercise emulation failures.
*/
static inline void flds(uint64_t address)
{
__asm__ __volatile__(FLDS_MEM_EAX :: "a"(address));
}
static inline void handle_flds_emulation_failure_exit(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
struct kvm_regs regs;
uint8_t *insn_bytes;
uint64_t flags;
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_INTERNAL_ERROR);
TEST_ASSERT(run->emulation_failure.suberror == KVM_INTERNAL_ERROR_EMULATION,
"Unexpected suberror: %u",
run->emulation_failure.suberror);
flags = run->emulation_failure.flags;
TEST_ASSERT(run->emulation_failure.ndata >= 3 &&
flags & KVM_INTERNAL_ERROR_EMULATION_FLAG_INSTRUCTION_BYTES,
"run->emulation_failure is missing instruction bytes");
TEST_ASSERT(run->emulation_failure.insn_size >= 2,
"Expected a 2-byte opcode for 'flds', got %d bytes",
run->emulation_failure.insn_size);
insn_bytes = run->emulation_failure.insn_bytes;
TEST_ASSERT(insn_bytes[0] == 0xd9 && insn_bytes[1] == 0,
"Expected 'flds [eax]', opcode '0xd9 0x00', got opcode 0x%02x 0x%02x\n",
insn_bytes[0], insn_bytes[1]);
vcpu_regs_get(vcpu, ®s);
regs.rip += 2;
vcpu_regs_set(vcpu, ®s);
}
#endif /* !SELFTEST_KVM_FLDS_EMULATION_H */
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