linux-kernel - [RFC PATCH 0/3] x86, kvm: Unify CPUID computation and fix MSR accessing

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Message-Id: <1447497436-26424-1-git-send-email-bp@alien8.de>
Date:	Sat, 14 Nov 2015 11:37:13 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Paolo Bonzini <pbonzini@...hat.com>, X86 ML <x86@...nel.org>,
	KVM <kvm@...r.kernel.org>
Subject: [RFC PATCH 0/3] x86, kvm: Unify CPUID computation and fix MSR accessing

From: Borislav Petkov <bp@...e.de>

Hi all,

so this is something which should help fixing the MSR access to IC_CFG
on AMD.

The usefulness should come, however, from the unification and the
additional family, model, stepping helpers in kvm in case one wants to
know those of the guest CPU. Who knows, might be much more useful in the
future.

Quick testing shows it works, I'll hammer on it more after rc1 is out.

Thanks.

Borislav Petkov (3):
  x86/cpu: Unify CPU family, model, stepping calculation
  kvm: Add accessors for guest CPU's family, model, stepping
  x86/cpu/amd, kvm: Satisfy guest kernel reads of IC_CFG MSR

 arch/x86/include/asm/cpu.h            |  3 +++
 arch/x86/include/asm/microcode.h      | 31 +++----------------------------
 arch/x86/include/asm/msr-index.h      |  1 +
 arch/x86/kernel/cpu/amd.c             |  4 ++--
 arch/x86/kernel/cpu/common.c          | 11 +++--------
 arch/x86/kernel/cpu/microcode/core.c  |  6 +++---
 arch/x86/kernel/cpu/microcode/intel.c | 16 ++++++----------
 arch/x86/kvm/cpuid.h                  | 34 ++++++++++++++++++++++++++++++++++
 arch/x86/kvm/svm.c                    | 17 +++++++++++++++++
 arch/x86/lib/Makefile                 |  2 +-
 arch/x86/lib/cpu.c                    | 35 +++++++++++++++++++++++++++++++++++
 11 files changed, 108 insertions(+), 52 deletions(-)
 create mode 100644 arch/x86/lib/cpu.c

-- 
2.3.5

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