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HV: Fix decode_instruction() trigger #UD for emulating UC-lock

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When ACRN uses decode_instruction to emulate split-lock/uc-lock
instruction, It is actually a try-decode to see if it is XCHG.
If the instruction is XCHG instruction, ACRN must emulate it
(inject #PF if it is triggered) with peer VCPUs paused, and advance
the guest IP. If the instruction is a LOCK prefixed instruction
with accessing the UC memory, ACRN Halted the peer VCPUs, and
advance the IP to skip the LOCK prefix, and then let the VCPU
Executes one instruction by enabling IRQ Windows vm-exit. For
other cases, ACRN injects the exception back to VCPU without
emulating it.
So change the API to decode_instruction(vcpu, bool full_decode),
when full_decode is true, the API does same thing as before. When
full_decode is false, the different is if decode_instruction() meet unknown
instruction, will keep return = -1 and do not inject #UD. We can use
this to distinguish that an #UD has been skipped, and need inject #AC/#GP back.

Tracked-On: #6299
Signed-off-by: Tao Yuhong <yuhong.tao@intel.com>
This commit is contained in:
Tao Yuhong
2021-06-17 09:21:34 -04:00
committed by wenlingz
parent 5817cf8256
commit 553d59644b
5 changed files with 21 additions and 9 deletions
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2
hypervisor/include/arch/x86/asm/guest/instr_emul.h
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@@ -92,7 +92,7 @@ struct instr_emul_ctxt {
};
int32_t emulate_instruction(struct acrn_vcpu *vcpu);
int32_t decode_instruction(struct acrn_vcpu *vcpu);
int32_t decode_instruction(struct acrn_vcpu *vcpu, bool full_decode);
bool is_current_opcode_xchg(struct acrn_vcpu *vcpu);
#endif