linux-kernel - Re: [PATCH 0/7] KVM: x86: Additional rflags.rf fixes

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Message-ID: <53CD056E.4050203@redhat.com>
Date:	Mon, 21 Jul 2014 14:19:58 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Nadav Amit <namit@...technion.ac.il>
CC:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, gleb@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/7] KVM: x86: Additional rflags.rf fixes

Il 21/07/2014 13:37, Nadav Amit ha scritto:
> RFLAGS.RF is not handled well by kvm, in both the x86 emulator and vmx code.
> This flag should be cleared after every instruction emulation (other than
> IRETD/IRETQ).  It should be set in various conditions as described in Intel SDM
> 17.3.1.1.  This series of patches addresses the clearing of RF on emulated
> instructions, the setting the RF upon fault injection.  It does not handle the
> case of traps and interrupts injection during REP-string, since there is
> no easy indication whether the first iteration of a rep-string occurred.
> The value of RF depends on whether the first iteration took place.
> 
> Thanks for reviewing the patches.
> 
> Nadav Amit (7):
>   KVM: x86: Defining missing x86 vectors
>   KVM: x86: Function for determining exception type
>   KVM: x86: Clearing rflags.rf upon skipped emulated instruction
>   KVM: vmx: set rflags.rf during fault injection
>   KVM: x86: popf emulation should not change RF
>   KVM: x86: Clear rflags.rf on emulated instructions
>   KVM: x86: Cleanup of rflags.rf cleaning
> 
>  arch/x86/include/uapi/asm/kvm.h |  3 +++
>  arch/x86/kvm/emulate.c          | 13 ++++++++-----
>  arch/x86/kvm/vmx.c              | 11 ++++++++++-
>  arch/x86/kvm/x86.c              | 37 +++++++++++++++++++++++++++++++++++++
>  arch/x86/kvm/x86.h              |  9 +++++++++
>  5 files changed, 67 insertions(+), 6 deletions(-)
> 

I'm not applying patches 2 and 4 yet.  I have applied the others:

      KVM: x86: Clearing rflags.rf upon skipped emulated instruction
      KVM: x86: popf emulation should not change RF
      KVM: x86: Clear rflags.rf on emulated instructions
      KVM: x86: Cleanup of rflags.rf cleaning
      KVM: x86: emulator injects #DB when RFLAGS.RF is set
      KVM: x86: Defining missing x86 vectors

since the remaining two are independent.

Thanks!

Paolo
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