Re: [Xen-devel] [PATCH 5/8] x86/hvm: Don't raise #GP behind the emulators back for MSR accesses

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Monday, December 05, 2016 6:09 PM
> 
> The current hvm_msr_{read,write}_intercept() infrastructure calls
> hvm_inject_hw_exception() directly to latch a fault, and returns
> X86EMUL_EXCEPTION to its caller.
> 
> This behaviour is problematic for the hvmemul_{read,write}_msr() paths, as the
> fault is raised behind the back of the x86 emulator.
> 
> Alter the behaviour so hvm_msr_{read,write}_intercept() simply returns
> X86EMUL_EXCEPTION, leaving the callers to actually inject the #GP fault.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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