linux-kernel - Re: Support of lguest?

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Message-ID: <87r2zqi4iz.fsf@vitty.brq.redhat.com>
Date:   Mon, 15 May 2017 16:22:12 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Juergen Gross <jgross@...e.com>
Cc:     Rusty Russell <rusty@...tcorp.com.au>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        virtualization@...ts.linux-foundation.org,
        xen-devel <xen-devel@...ts.xenproject.org>,
        lguest@...ts.ozlabs.org
Subject: Re: Support of lguest?

Juergen Gross <jgross@...e.com> writes:

> Lguest and Xen pv-guests are the only users of pv_mmu_ops (with the
> one exception of the .exit_mmap member, which is being used by Xen
> HVM-guests, too).
>
> As it is possible now to build a kernel without Xen pv-guest support
> while keeping PVH and PVHVM support, I thought about putting most
> pv_mmu_ops functions in #ifdef CONFIG_XEN_HAS_PVMMU sections.

There is an ongoing work to enable PV TLB flushing for Hyper-V guests:
http://driverdev.linuxdriverproject.org/pipermail/driverdev-devel/2017-April/104411.html

it utilizes .flush_tlb_others member in pv_mmu_ops.

hopefully, this work will be merged in 4.13.

-- 
  Vitaly