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Re: [Xen-devel] [tip:x86/platform] x86/hyper-v: Use hypercall for remote TLB flush
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Fri, 11 Aug 2017 14:54:42 +0200
- Cc: boris.ostrovsky@xxxxxxxxxx, Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>, "linux-tip-commits@xxxxxxxxxxxxxxx" <linux-tip-commits@xxxxxxxxxxxxxxx>, Jork Loeser <Jork.Loeser@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "rostedt@xxxxxxxxxxx" <rostedt@xxxxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, Simon Xiao <sixiao@xxxxxxxxxxxxx>, "andy.shevchenko@xxxxxxxxx" <andy.shevchenko@xxxxxxxxx>, "luto@xxxxxxxxxx" <luto@xxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, KY Srinivasan <kys@xxxxxxxxxxxxx>, "torvalds@xxxxxxxxxxxxxxxxxxxx" <torvalds@xxxxxxxxxxxxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>
- Delivery-date: Fri, 11 Aug 2017 12:54:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Fri, Aug 11, 2017 at 02:46:41PM +0200, Juergen Gross wrote:
> Aah, okay. Now I understand the problem. The TLB isn't the issue but the
> IPI is serving two purposes here: TLB flushing (which is allowed to
> happen at any time) and serialization regarding access to critical pages
> (which seems to be broken in the Xen case as you suggest).
Indeed, and now hyper-v as well.
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