linux-kernel - Re: [PATCH 21/22] kvm: mmu: Support MMIO in the TDP MMU

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Message-ID: <20200930181907.GK32672@linux.intel.com>
Date:   Wed, 30 Sep 2020 11:19:07 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Ben Gardon <bgardon@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Cannon Matthews <cannonmatthews@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Xu <peterx@...hat.com>, Peter Shier <pshier@...gle.com>,
        Peter Feiner <pfeiner@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>
Subject: Re: [PATCH 21/22] kvm: mmu: Support MMIO in the TDP MMU

On Fri, Sep 25, 2020 at 02:23:01PM -0700, Ben Gardon wrote:
> In order to support MMIO, KVM must be able to walk the TDP paging

Probably worth clarifying that this is for emulated MMIO, as opposed to
mapping MMIO host addresses.

> structures to find mappings for a given GFN. Support this walk for
> the TDP MMU.