Messages in this thread | | | From | Dan Williams <> | Date | Tue, 8 Jun 2021 16:12:18 -0700 | Subject | Re: [RFC v2-fix-v2 1/3] x86/tdx: Handle port I/O in decompression code |
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On Tue, Jun 8, 2021 at 8:40 AM Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> wrote: > > Add support to replace in/out instructions in > decompression code with TDX IO hypercalls. > > TDX cannot do port IO directly. The TDX module triggers > a #VE exception to let the guest kernel to emulate port > I/O, by converting them into TDX hypercalls to call the > host. > > But for the really early code in the decompressor, #VE > cannot be used because the IDT needed for handling the > exception is not set-up, and some other infrastructure > needed by the handler is missing. So to support port IO > in decompressor code, directly replace in/out instructions > with TDX IO hypercalls. This can beeasily achieved by > modifying __in/__out macros. > > Also, since TDX IO hypercall requires an IO size parameter, > modify __in/__out macros to accept size as input parameter.
Looks good to me:
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
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