Hi I'm trying to emulate the lwzu instruction in e500 powerpc kvm for my project . I've removed the read and write privileges from the tlb entries of guest's certain pages . So when i'm trying to emulate lwzu instruction i'm getting a kernel panic while mounting the guest filesystem while booting . attempt to access beyond end of device ram0: rw=0, want=75703268, limit=262144 To make sure that the emulation is faulty what i'm trying to do now is at the time of DATA STORAGE exit on a marked page by an lwzu instruction i'm patching the next instruction with an instruction which will raise an INTERRUPT PROGRAM EXCEPTION and will get trapped in kvm and then i'm reverting the old read and write privileges of this page and resuming the guest so that this LWZU instruction can run natively . I'm expecting the immediate next instruction to raise the INTERRUPT PROGRAM EXCEPTION but all i'm getting are DATA STORAGE Exits at other pages marked by me and DTLB and ITLB misses on other addresses . I've made sure to flush the icache after i patch using the instruction flush_icache_range . Error Log : Emulating a lwzu instruction on pc 0xc00161ac && eaddr 0xc05742f0 Original Instruction is 0x90e60004 at pc: 0xc00161b0 Modified Instruction is 0x7ce000a6 at pc: 0xc00161b0 Exit : Interrupt DATA STORAGE at pc 0xc000f210 on eaddr:0xc000f228 instruction: 0x8085001c Why i'm not getting any INTERRUPT PROGRAM EXCEPTION immediately in the next instruction ? -- Thanks and regards Aashish Mittal -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
