[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Re: X86_emulate to be moved into qemu...
On 18 May 2006, at 10:33, Petersson, Mats wrote: Yes, you could walk pagetables. But equally you can pass in your translated CR2 value --- i.e., pass in a pseudophysical address. That address will then be passed to the special read/write hook functions, so you avoid needing to do the translation inside those.Hmm, yes. But we also want CS:rIP translated, which isn't too bad. And for movs we have both the source and destination to take into account. ES:rDI isn't bad, but xS:rSI isn't as trivial, since we'd have to scanfor segment overrides in that case - and now we're starting to look likea bunch of decoding code in two places again... :-( [Admittedly not quite as much] The code should be passed in a buffer. This will be needed for interfacing with VMX anyway, since it places the instruction in a handy on-chip buffer for convenient readout. That gets rid of any need for CS:RIP decoding. Yes, we will need translation in a few places for dual-memory-operand instructions (MOVS, stack instructions, etc). So we will need to walk pagetables. It's just that the *common* case will be to need no walk. The segment override is no problem -- it's already implemented. -- Keir What header files are those? It builds in tools/test/ without so many header files.'hg status' says: I'll fix that. -- Keir M ioemu/target-i386-dm/Makefile M ioemu/target-i386-dm/helper2.c ? ioemu/target-i386-dm/x86_emulate.c ? libxc/asm-x86/bitops.h ? libxc/asm-x86/cache.h ? libxc/asm-x86/config.h ? libxc/asm-x86/desc.h ? libxc/asm-x86/mm.h ? libxc/asm-x86/page.h ? libxc/asm-x86/processor.h ? libxc/asm-x86/regs.h ? libxc/asm-x86/rwlock.h ? libxc/asm-x86/spinlock.h ? libxc/asm-x86/string.h ? libxc/asm-x86/system.h ? libxc/asm-x86/types.h ? libxc/asm-x86/uaccess.h ? libxc/asm-x86/x86_emulate.h ? libxc/public/arch-x86_32.h ? libxc/public/arch-x86_64.h ? libxc/public/xen-compat.h ? libxc/public/xen.h -- Mats-- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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