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