linux-kernel - [PATCH v3] x86: SVM: Use the hardware provided GPA instead of page walk

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Message-ID: <148174555164.13485.11526818510637119259.stgit@brijesh-build-machine>
Date:   Wed, 14 Dec 2016 14:59:11 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     <kvm@...r.kernel.org>
CC:     <thomas.lendacky@....com>, <rkrcmar@...hat.com>, <joro@...tes.org>,
        <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
        <mingo@...hat.com>, <hpa@...or.com>, <pbonzini@...hat.com>,
        <tglx@...utronix.de>, <bp@...e.de>
Subject: [PATCH v3] x86: SVM: Use the hardware provided GPA instead of page
 walk

This patch series is taken from SEV RFC series [1]. These patches do not
depend on the SEV feature and can be reviewed and merged on their own.

- Use the hardware provided GPA instead of page walk

[1] http://marc.info/?l=linux-mm&m=147190814023863&w=2

---

Droping the following patches from series since they are already accepted

- Add support for additional SVM NFP error codes
- Add kvm_fast_pio_in support


Changes since v2:
 - add TwoMemOps flag to detect a opcode with two memory operand.
 - remove emulator_is_string_op() and add emulator_can_use_gpa().
   emulator_can_use_gpa() returns true if its safe to use HW provided GPA.

Changes since v1:
 - move String op identifier check into new emulator_is_string_op().
 - move gpa_available check in emulator_read_write_onepage().
 - remove redundant gpa_avail check

Tom Lendacky (1):
      kvm: svm: Use the hardware provided GPA instead of page walk


 arch/x86/include/asm/kvm_emulate.h |    1 +
 arch/x86/include/asm/kvm_host.h    |    3 ++
 arch/x86/kvm/emulate.c             |   20 +++++++++++++---
 arch/x86/kvm/svm.c                 |    2 ++
 arch/x86/kvm/x86.c                 |   45 ++++++++++++++++++++++++++++--------
 5 files changed, 57 insertions(+), 14 deletions(-)

-- 

Brijesh Singh