linux-kernel - Re: [PATCH v2 0/3] KVM: x86: KVM_MEM_PCI

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Message-ID: <20200904072056.qy3yse7jarwgunu7@sirius.home.kraxel.org>
Date:   Fri, 4 Sep 2020 09:20:56 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Michael Tsirkin <mst@...hat.com>,
        Julia Suvorova <jsuvorov@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Jones <drjones@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] KVM: x86: KVM_MEM_PCI_HOLE memory

  Hi,

> attached.  Though those should be far less than 8000+, and those should also be
> pio rather than mmio.

Well, seabios 1.14 (qemu 5.1) added mmio support (to speed up boot a
little bit, mmio is one and pio is two vmexits).

Depends on q35 obviously, and a few pio accesses remain b/c seabios has
to first setup mmconfig.

take care,
  Gerd