linux-kernel - [RFC v2-fix-v2 0/3] x86/tdx: Handle port I/O

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Message-Id: <cover.1623165571.git.sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Tue,  8 Jun 2021 08:40:20 -0700
From:   Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-kernel@...r.kernel.org,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: [RFC v2-fix-v2 0/3] x86/tdx: Handle port I/O

This patchset addresses the review comments in the patch titled
"[RFC v2 14/32] x86/tdx: Handle port I/O". Since it requires
patch split, sending these together.

Changes since RFC v2-fix-v1:
 * Splitted TDX decompression IO support into a seperate patch.
 * Implemented tdg_handle_io() and tdx_early_io() in the similar
   way as per review suggestion.
 * Added VE_IS_IO_OUT() macro as per review suggestion.
 * Added VE_IS_IO_STRING() to check the string I/O case in
   tdx_early_io()
 * Removed helper function tdg_in() and tdg_out() and directly
   called IO hypercall to make the implementation uniform in
   decompression code, early IO code and normal IO handler code.

Changes since RFC v2:
 * Removed assembly implementation of port IO emulation code
   and modified __in/__out IO helpers to directly call C function
   for in/out instruction emulation in decompression code.
 * Added helper function tdx_get_iosize() to make it easier for
   calling tdg_out/tdg_int() C functions from decompression code.
 * Added support for early exception handler to support IO
   instruction emulation in early boot kernel code.
 * Removed alternative_ usage and made kernel only use #VE based
   IO instruction emulation support outside the decompression module.
 * Added support for protection_guest_has() API to generalize
   AMD SEV/TDX specific initialization code in common drivers.
 * Fixed commit log and comments as per review comments.

Andi Kleen (1):
  x86/tdx: Handle early IO operations

Kirill A. Shutemov (1):
  x86/tdx: Handle port I/O

Kuppuswamy Sathyanarayanan (1):
  x86/tdx: Handle port I/O in decompression code

 arch/x86/boot/compressed/Makefile |  1 +
 arch/x86/boot/compressed/tdcall.S |  3 ++
 arch/x86/include/asm/io.h         | 15 +++---
 arch/x86/include/asm/tdx.h        | 54 ++++++++++++++++++++
 arch/x86/kernel/head64.c          |  3 ++
 arch/x86/kernel/tdx.c             | 84 +++++++++++++++++++++++++++++++
 6 files changed, 154 insertions(+), 6 deletions(-)
 create mode 100644 arch/x86/boot/compressed/tdcall.S

-- 
2.25.1