Tao Yuhong 553d59644b HV: Fix decode_instruction() trigger #UD for emulating UC-lock ... 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>		2021-07-21 11:25:47 +08:00
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x86/asm	HV: Fix decode_instruction() trigger #UD for emulating UC-lock	2021-07-21 11:25:47 +08:00