On 03/31/2011 09:14 AM, Roedel, Joerg wrote:
On Mon, Mar 28, 2011 at 08:28:12AM -0400, Avi Kivity wrote:
> The spec indicates we need to check the TSS and IOPL based permissions
> before the intercept (vmx agrees). With the code as is, it happens
> afterwards.
>
> One way to do this is to have an ExtraChecks bit in the opcode::flags.
> Then opcode::u.xcheck->perms() is the pre-intercept check and
> opcode::u.xcheck->execute() is the post-intercept execution. Should
> work for monitor/mwait/rdtsc(p)/rdpmc/other crap x86 throws at us.
Okay, as you suggested, I put these checks into the instruction emulator
and let the hard work of implementing per-arch checks to the nested-vmx
people ;)
I doubt that this makes the opcode-tables more readable, but lets see :)
I think we're miscommunicating. I'm talking about x86 checks, not virt
vendor specific checks.
For example, the flow for IOIO would be:
#UD check (lock prefix)
PE/IOPL/CPL/VM check
TSS bitmap check (can cause #PF)
Intercept check
Operand segment check
Possible #PF
Execution
We need to make sure the TSS bitmap check happens before the intercept,
so we need to split ->execute() into two.
--
error compiling committee.c: too many arguments to function
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