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Re: [Xen-devel] [PATCH v2 01/12] VMX: reduce number of posted-interrupt hooks


  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
  • Date: Thu, 30 Aug 2018 01:41:08 +0000
  • Accept-language: en-US
  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
  • Delivery-date: Thu, 30 Aug 2018 01:41:52 +0000
  • Dlp-product: dlpe-windows
  • Dlp-reaction: no-action
  • Dlp-version: 11.0.400.15
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Thread-index: AQHUP6CDTSE7aovcXE6AskYRjH1q06TXhXBA
  • Thread-topic: [PATCH v2 01/12] VMX: reduce number of posted-interrupt hooks

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Wednesday, August 29, 2018 9:59 PM
> 
> Three of the four hooks are not exposed outside of vmx.c, and all of
> them have only a single possible non-NULL value. So there's no reason to
> use hooks here - a simple set of flag indicators is sufficient (and we
> don't even need a flag for the VM entry one, as it's always
> (de-)activated together the the vCPU blocking hook, which needs to
> remain an actual function pointer). This is the more that with the
> Spectre v2 workarounds indirect calls have become more expensive.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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