linux-kernel - RE: [PATCH 6/7] x86/hyper-v: use hypercall for remove TLB flush

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Date:   Mon, 10 Apr 2017 17:34:55 +0000
From:   Jork Loeser <Jork.Loeser@...rosoft.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        KY Srinivasan <kys@...rosoft.com>
CC:     "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: RE: [PATCH 6/7] x86/hyper-v: use hypercall for remove TLB flush

> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets@...hat.com]

> > We may be supporting more than 64 CPUs in this hypercall. I am going
> > to inquire with the Windows folks and get back to you.
> 
> Thanks! It is even specified in the specification:
> "Future versions of the hypervisor may support more than 64 virtual
> processors per partition. In that case, a new field will be added to the flags
> value that allows the caller to define the “processor bank” to which the
> processor mask applies."
> 
> We, however, need to know where to put this in flags.

Would the HvFlushVirtualAddressListEx hypercall do? Is there a doc update/clarification needed?

Regards,
Jork