linux-kernel - Re: [PATCH 0/2] Expose VMFUNC to the nested hypervisor

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Date:   Fri, 30 Jun 2017 15:06:18 -0400 (EDT)
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Jim Mattson <jmattson@...gle.com>
Cc:     Bandan Das <bsd@...hat.com>, kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] Expose VMFUNC to the nested hypervisor



----- Original Message -----
> From: "Jim Mattson" <jmattson@...gle.com>
> To: "Bandan Das" <bsd@...hat.com>
> Cc: "kvm list" <kvm@...r.kernel.org>, "Paolo Bonzini" <pbonzini@...hat.com>, "LKML" <linux-kernel@...r.kernel.org>
> Sent: Friday, June 30, 2017 7:06:43 PM
> Subject: Re: [PATCH 0/2] Expose VMFUNC to the nested hypervisor
> 
> Isn't McAfee DeepSAFE defunct? Are there any other consumers of EPTP
> switching?

Xen can use it optionally, and #VE as well.

Paolo

> On Thu, Jun 29, 2017 at 4:29 PM, Bandan Das <bsd@...hat.com> wrote:
> > These patches expose eptp switching/vmfunc to the nested hypervisor.
> > Testing with
> > kvm-unit-tests seems to work ok.
> >
> > If the guest hypervisor enables vmfunc/eptp switching, a "shadow" eptp list
> > address page is written to the VMCS. Initially, it would be unpopulated
> > which
> > would result in a vmexit with exit reason 59. This hooks to handle_vmfunc()
> > to rewrite vmcs12->ept_pointer to reload the mmu and get a new root hpa.
> > This new shadow ept pointer is written to the shadow eptp list in the given
> > index. A next vmfunc call to switch to the given index would succeed
> > without
> > an exit.
> >
> > Bandan Das (2):
> >   KVM: nVMX: Implement EPTP switching for the L1 hypervisor
> >   KVM: nVMX: Advertise VMFUNC to L1 hypervisor
> >
> >  arch/x86/include/asm/vmx.h |   9 ++++
> >  arch/x86/kvm/vmx.c         | 122
> >  +++++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 131 insertions(+)
> >
> > --
> > 2.9.4
> >
>