,黄韶宇
时间：2017-09-06 23:19:38
主题:Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits
On 06/09/17 16:08, gengdongjiu wrote:
> It is similar with the PAN，when the guest traps to el2，it will reset the
> pstate.PAN <http://pstate.PAN> to 0, and continue run。In fact the host
Hi gengdongjiu,
[auto build test ERROR on arm64/for-next/core]
[also build test ERROR on v4.13 next-20170906]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system]
url:
...@linaro.org,pbonz...@redhat.com,rkrc...@redhat.com,linux-arm-ker...@lists.infradead.org,kvmarm@lists.cs.columbia.edu,k...@vger.kernel.org,linux-kernel,suzuki.poul...@arm.com,mark.rutl...@arm.com,Catalin
> Marinas
> *抄送：*James Morse,张海斌,黄韶宇
> *时间：*2017-09-06 22:41:09
> *主题:*Re: [P
..@arm.com,Catalin
Marinas
抄送：James Morse,张海斌,黄韶宇
时间：2017-09-06 22:41:09
主题:Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits
On 06/09/17 15:10, gengdongjiu wrote:
> Hi, Vladimir
>
>>>> Do you see effect of "PAN is unexpectedly enabled"?
>>> In fact
nas
抄送：James Morse,张海斌,黄韶宇
时间：2017-09-06 22:41:09
主题:Re: [PATCH] arm64: KVM: VHE: save and restore some PSTATE bits
On 06/09/17 15:10, gengdongjiu wrote:
> Hi, Vladimir
>
>>>> Do you see effect of "PAN is unexpectedly enabled"?
>>> In fact I did not encounter t
On 06/09/17 15:10, gengdongjiu wrote:
> Hi, Vladimir
>
Do you see effect of "PAN is unexpectedly enabled"?
>>> In fact I did not encounter this case, but I think it can exist.
>>> I think if host OS dynamically disable PAN, it wants the host kernel access
>>> the user space address space
Hi, Vladimir
> >> Do you see effect of "PAN is unexpectedly enabled"?
> > In fact I did not encounter this case, but I think it can exist.
> > I think if host OS dynamically disable PAN, it wants the host kernel access
> > the user space address space not through copy_to/from_user
> API.
> > Now
On 06/09/17 13:44, gengdongjiu wrote:
>
>
> On 2017/9/6 20:30, Vladimir Murzin wrote:
>> On 06/09/17 13:14, gengdongjiu wrote:
>>>
>>>
>>> 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:
On 2017/9/6 20:30, Vladimir Murzin wrote:
> On 06/09/17 13:14, gengdongjiu wrote:
>>
>>
>> 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
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
On 06/09/17 13:14, gengdongjiu wrote:
>
>
> 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
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
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.
>
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
For UAO, if not save/restore PSTATE.UAO, we can use below fixing.
diff --git a/arch/arm64/kvm/hyp/sysreg-sr.c b/arch/arm64/kvm/hyp/sysreg-sr.c
index 9341376..c3dd761 100644
--- a/arch/arm64/kvm/hyp/sysreg-sr.c
+++ b/arch/arm64/kvm/hyp/sysreg-sr.c
@@ -21,6 +21,8 @@
#include
#include
+#include
On 06/09/17 10:32, gengdongjiu wrote:
> Hi Marc,
>
> On 2017/9/6 16:17, Marc Zyngier wrote:
>> On 05/09/17 19:58, gengdongjiu wrote:
>>> when exit from guest, some host PSTATE bits may be lost, such as
>>> PSTATE.PAN or PSTATE.UAO. It is because host and hypervisor all run
>>> in the EL2, host
Hi Marc,
On 2017/9/6 16:17, Marc Zyngier wrote:
> On 05/09/17 19:58, gengdongjiu wrote:
>> when exit from guest, some host PSTATE bits may be lost, such as
>> PSTATE.PAN or PSTATE.UAO. It is because host and hypervisor all run
>> in the EL2, host PSTATE value cannot be saved and restored via
>>
On 05/09/17 19:58, gengdongjiu wrote:
> when exit from guest, some host PSTATE bits may be lost, such as
> PSTATE.PAN or PSTATE.UAO. It is because host and hypervisor all run
> in the EL2, host PSTATE value cannot be saved and restored via
> SPSR_EL2. So if guest has changed the PSTATE, host
CC Catalin
On 2017/9/6 2:58, gengdongjiu wrote:
> when exit from guest, some host PSTATE bits may be lost, such as
> PSTATE.PAN or PSTATE.UAO. It is because host and hypervisor all run
> in the EL2, host PSTATE value cannot be saved and restored via
> SPSR_EL2. So if guest has changed the
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