Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits

From	gengdongjiu <gengdongjiu@huawei.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits
Date	2017-09-06 14:20 +0200
Message-ID	<umHtf-1Ck-1@gated-at.bofh.it> (permalink)
References	(1 earlier) <umDJ0-7kw-17@gated-at.bofh.it> <umEYp-89a-1@gated-at.bofh.it> <umF85-8in-13@gated-at.bofh.it> <umFUv-oN-7@gated-at.bofh.it> <umHjA-1yw-23@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 2017/9/6 20:00, Vladimir Murzin wrote:
> On 06/09/17 11:35, gengdongjiu wrote:
>> Vladimir,
>>
>> On 2017/9/6 17:41, Vladimir Murzin wrote:
>>> Can you please elaborate on cases where PAN is not enabled?
>>
>> I mean the informal private usage, For example, he disabled the PAN dynamically to let kernel space to access the user space.
>> After he dynamic disabled the PAN, then switched to guest OS. after return to host. he found the PAN stage is modified.
>> Of cause this is not a formal usage, in our host kernel, it is always enabled, no dynamic change, but I means it may exist such cases.
>>
>>
> 
> So, in short, there is no real issue with PAN, right? What about UAO?
For the PAN, if host OS dynamically enable/disable PAN should have issue.
Do you think that is not a issue as above description?

"host OS dynamically disable the PAN, but after go back from the guest OS, The PAN is unexpectedly enabled"

> 
> Cheers
> Vladimir
> 
> .
>

Thread

[PATCH] arm64: KVM: VHE: save and restore some PSTATE bits gengdongjiu <gengdongjiu@huawei.com> - 2017-09-05 21:10 +0200
  Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits gengdongjiu <gengdongjiu@huawei.com> - 2017-09-06 07:30 +0200
  Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits Marc Zyngier <marc.zyngier@arm.com> - 2017-09-06 10:20 +0200
    Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits gengdongjiu <gengdongjiu@huawei.com> - 2017-09-06 11:40 +0200
      Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits Vladimir Murzin <vladimir.murzin@arm.com> - 2017-09-06 11:50 +0200
        Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits gengdongjiu <gengdongjiu@huawei.com> - 2017-09-06 12:40 +0200
          Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits Vladimir Murzin <vladimir.murzin@arm.com> - 2017-09-06 14:10 +0200
            Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits gengdongjiu <gengdongjiu@huawei.com> - 2017-09-06 14:20 +0200
              Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits Vladimir Murzin <vladimir.murzin@arm.com> - 2017-09-06 14:40 +0200
                Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits gengdongjiu <gengdongjiu@huawei.com> - 2017-09-06 14:50 +0200
                Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits Vladimir Murzin <vladimir.murzin@arm.com> - 2017-09-06 15:10 +0200
            Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits gengdongjiu <gengdongjiu@huawei.com> - 2017-09-06 14:40 +0200
      Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits gengdongjiu <gengdongjiu@huawei.com> - 2017-09-06 12:00 +0200

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