| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | #ifndef SELFTEST_KVM_FLDS_EMULATION_H |
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| 3 | #define SELFTEST_KVM_FLDS_EMULATION_H |
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| 4 | |
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| 5 | #include "kvm_util.h" |
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| 6 | |
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| 7 | #define FLDS_MEM_EAX ".byte 0xd9, 0x00" |
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| 8 | |
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| 9 | /* |
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| 10 | * flds is an instruction that the KVM instruction emulator is known not to |
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| 11 | * support. This can be used in guest code along with a mechanism to force |
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| 12 | * KVM to emulate the instruction (e.g. by providing an MMIO address) to |
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| 13 | * exercise emulation failures. |
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| 14 | */ |
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| 15 | static inline void flds(uint64_t address) |
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| 16 | { |
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| 17 | __asm__ __volatile__(FLDS_MEM_EAX :: "a" (address)); |
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| 18 | } |
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| 19 | |
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| 20 | static inline void handle_flds_emulation_failure_exit(struct kvm_vcpu *vcpu) |
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| 21 | { |
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| 22 | struct kvm_run *run = vcpu->run; |
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| 23 | struct kvm_regs regs; |
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| 24 | uint8_t *insn_bytes; |
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| 25 | uint64_t flags; |
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| 26 | |
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| 27 | TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_INTERNAL_ERROR); |
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| 28 | |
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| 29 | TEST_ASSERT(run->emulation_failure.suberror == KVM_INTERNAL_ERROR_EMULATION, |
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| 30 | "Unexpected suberror: %u" , |
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| 31 | run->emulation_failure.suberror); |
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| 32 | |
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| 33 | flags = run->emulation_failure.flags; |
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| 34 | TEST_ASSERT(run->emulation_failure.ndata >= 3 && |
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| 35 | flags & KVM_INTERNAL_ERROR_EMULATION_FLAG_INSTRUCTION_BYTES, |
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| 36 | "run->emulation_failure is missing instruction bytes" ); |
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| 37 | |
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| 38 | TEST_ASSERT(run->emulation_failure.insn_size >= 2, |
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| 39 | "Expected a 2-byte opcode for 'flds', got %d bytes" , |
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| 40 | run->emulation_failure.insn_size); |
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| 41 | |
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| 42 | insn_bytes = run->emulation_failure.insn_bytes; |
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| 43 | TEST_ASSERT(insn_bytes[0] == 0xd9 && insn_bytes[1] == 0, |
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| 44 | "Expected 'flds [eax]', opcode '0xd9 0x00', got opcode 0x%02x 0x%02x" , |
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| 45 | insn_bytes[0], insn_bytes[1]); |
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| 46 | |
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| 47 | vcpu_regs_get(vcpu, ®s); |
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| 48 | regs.rip += 2; |
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| 49 | vcpu_regs_set(vcpu, ®s); |
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| 50 | } |
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| 51 | |
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| 52 | #endif /* !SELFTEST_KVM_FLDS_EMULATION_H */ |
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| 53 | |
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