linux-kernel - Re: [PATCH 0/3] KVM, pkeys: fix handling of PKRU across migration

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Date:   Mon, 11 Sep 2017 12:01:08 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Quan Xu <quan.xu0@...il.com>, Yang Zhang <yang.zhang.wz@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        junkang.fjk@...baba-inc.com
Subject: Re: [PATCH 0/3] KVM, pkeys: fix handling of PKRU across migration

On 28/08/2017 03:32, Quan Xu wrote:
> 
> Paolo， I have verified this patch set..

Thanks!  In the end I managed to use QEMU's SVM emulation to convince
myself that the code was correct, so it is already included in Linux 4.13.

Paolo

> Tested-by: Quan Xu <quan.xu0@...il.com <mailto:quan.xu0@...il.com>>
> 
> 2017-08-25 8:43 GMT+08:00 Yang Zhang <yang.zhang.wz@...il.com
> <mailto:yang.zhang.wz@...il.com>>:
> 
>     On 2017/8/24 18:12, Paolo Bonzini wrote:
> 
>         The host pkru is restored right after vcpu exit (commit 1be0e61), so
>         KVM_GET_XSAVE will return the host PKRU value instead.  In general,
>         the PKRU value in vcpu->arch.guest_fpu.state cannot be trusted.
> 
>         Series as follows:
> 
>         1) fix independent bug which would cause an oops
> 
>         2) remove an unnecessary abstraction
> 
>         3) fix the bug
> 
>         Please test the patches, as I don't have the affected hardware. 
>         Note
>         that I need the results before tomorrow in order to send these
>         patches
>         to Linus before going on vacation.
> 
> 
>     hi Quan
> 
>     Can you help to test Paolo's patch?
> 
> 
>         Thanks,
> 
>         Paolo
> 
> 
>         Paolo Bonzini (3):
>            KVM: x86: block guest protection keys unless the host has
>         them enabled
>            KVM: x86: simplify handling of PKRU
>            KVM, pkeys: do not use PKRU value in vcpu->arch.guest_fpu.state
> 
>           arch/x86/include/asm/fpu/internal.h |  6 +++---
>           arch/x86/include/asm/kvm_host.h     |  1 +
>           arch/x86/kvm/cpuid.c                |  2 +-
>           arch/x86/kvm/kvm_cache_regs.h       |  5 -----
>           arch/x86/kvm/mmu.h                  |  2 +-
>           arch/x86/kvm/svm.c                  |  7 -------
>           arch/x86/kvm/vmx.c                  | 25 ++++++++-----------------
>           arch/x86/kvm/x86.c                  | 17 ++++++++++++++---
>           8 files changed, 28 insertions(+), 37 deletions(-)
> 
> 
> 
>     -- 
>     Yang
>     Alibaba Cloud Computing
> 
>