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Date: Wed, 6 Sep 2017 20:14:20 +0800 From: gengdongjiu <gengdongjiu@...wei.com> To: Vladimir Murzin <vladimir.murzin@....com>, Marc Zyngier <marc.zyngier@....com>, "christoffer.dall@...aro.org" <christoffer.dall@...aro.org>, "pbonzini@...hat.com" <pbonzini@...hat.com>, "rkrcmar@...hat.com" <rkrcmar@...hat.com>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "suzuki.poulose@....com" <suzuki.poulose@....com>, <mark.rutland@....com>, <catalin.marinas@....com> CC: James Morse <James.Morse@....com>, <zhanghaibin7@...wei.com>, Huangshaoyu <huangshaoyu@...wei.com> Subject: Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits 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 > > . >
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