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Date:   Fri, 4 Sep 2020 09:20:56 +0200
From:   Gerd Hoffmann <kraxel@redhat.com>
To:     Peter Xu <peterx@redhat.com>
Cc:     Vitaly Kuznetsov <vkuznets@redhat.com>, kvm@vger.kernel.org,
        Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Michael Tsirkin <mst@redhat.com>,
        Julia Suvorova <jsuvorov@redhat.com>,
        Andy Lutomirski <luto@kernel.org>,
        Andrew Jones <drjones@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 0/3] KVM: x86: KVM_MEM_PCI_HOLE memory
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 <20200825212526.GC8235@xz-x1>
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  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