[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v2 02/13] Set VCPU's is_running flag closer to when the VCPU is dispatched
>>> On 20.09.13 at 11:42, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> wrote: > An interrupt handler happening during new VCPU scheduling may want to know > who was on the (physical) processor at the point of the interrupt. Just > looking at 'current' may not be accurate since there is a window of time when > 'current' points to new VCPU and its is_running flag is set but the VCPU has > not been dispatched yet. More importantly, on Intel processors, if the handler > wants to examine certain state of an HVM VCPU (such as segment registers) the > VMCS pointer is not set yet. > > This patch will move setting the is_running flag to a later point. As said on v1 already - I'm all but convinced that this is not going to break something in subtle ways. Without you assuring us that you carefully inspected _all_ uses of this flag, I don't think this can go in. Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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