Messages in this thread | | | Subject | Re: [PATCH 0/4] KVM: x86: TIF_NEED_FPU_LOAD bug fixes | From | "Liu, Jing2" <> | Date | Wed, 4 Mar 2020 15:38:44 +0800 |
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On 1/17/2020 2:26 PM, Sean Christopherson wrote: > TIF_FPU_NEED_LOAD can be set any time > control is transferred out of KVM, e.g. via IRQ->softirq, not just when > KVM is preempted.
Hi Sean,
Is this just because kernel_fpu_begin() is called during softirq? I saw the dump trace in 3/4 message, but didn't find out clue.
Could I ask where kernel_fpu_begin() is called? Or is this just a "possible" thing?
Because I just want to make sure that, kvm can use this flag to cover all preempt/softirq/(other?) cases?
Thanks,
Jing
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