From: Sean Christopherson <sean.j.christopherson@intel.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>,
Peter Xu <peterx@redhat.com>,
kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>,
Julia Suvorova <jsuvorov@redhat.com>,
Andy Lutomirski <luto@kernel.org>,
Andrew Jones <drjones@redhat.com>,
linux-kernel@vger.kernel.org, Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [PATCH v2 0/3] KVM: x86: KVM_MEM_PCI_HOLE memory
Date: Mon, 21 Sep 2020 10:21:14 -0700 [thread overview]
Message-ID: <20200921172114.GA24289@linux.intel.com> (raw)
In-Reply-To: <20200918083134-mutt-send-email-mst@kernel.org>
On Fri, Sep 18, 2020 at 08:34:37AM -0400, Michael S. Tsirkin wrote:
> On Fri, Sep 11, 2020 at 10:00:31AM -0700, Sean Christopherson wrote:
> > On Mon, Sep 07, 2020 at 07:32:23AM -0400, Michael S. Tsirkin wrote:
> > > I suspect microvms will need pci eventually. I would much rather KVM
> > > had an exit-less discovery mechanism in place by then because
> > > learning from history if it doesn't they will do some kind of
> > > hack on the kernel command line, and everyone will be stuck
> > > supporting that for years ...
> >
> > Is it not an option for the VMM to "accurately" enumerate the number of buses?
> > E.g. if the VMM has devices on only bus 0, then enumerate that there is one
> > bus so that the guest doesn't try and probe devices that can't possibly exist.
> > Or is that completely non-sensical and/or violate PCIe spec?
>
>
> There is some tension here, in that one way to make guest boot faster
> is to defer hotplug of devices until after it booted.
Sorry, I didn't follow that, probably because my PCI knowledge is lacking.
What does device hotplug have to do with the number of buses enumerated to
the guest?
next prev parent reply other threads:[~2020-09-21 17:21 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-07 14:12 [PATCH v2 0/3] KVM: x86: KVM_MEM_PCI_HOLE memory Vitaly Kuznetsov
2020-08-07 14:12 ` [PATCH v2 1/3] KVM: x86: move kvm_vcpu_gfn_to_memslot() out of try_async_pf() Vitaly Kuznetsov
2020-08-14 1:40 ` Sean Christopherson
2020-09-01 14:15 ` Vitaly Kuznetsov
2020-09-04 3:47 ` Sean Christopherson
2020-08-07 14:12 ` [PATCH v2 2/3] KVM: x86: introduce KVM_MEM_PCI_HOLE memory Vitaly Kuznetsov
2020-08-14 2:31 ` Sean Christopherson
2020-08-14 14:30 ` Michael S. Tsirkin
2020-08-17 16:32 ` Sean Christopherson
2020-08-21 1:46 ` Michael S. Tsirkin
2020-08-22 3:19 ` Sean Christopherson
2020-09-01 14:39 ` Vitaly Kuznetsov
2020-09-03 9:35 ` Michael S. Tsirkin
2020-08-07 14:12 ` [PATCH v2 3/3] KVM: selftests: add KVM_MEM_PCI_HOLE test Vitaly Kuznetsov
2020-08-25 21:25 ` [PATCH v2 0/3] KVM: x86: KVM_MEM_PCI_HOLE memory Peter Xu
2020-09-01 14:43 ` Vitaly Kuznetsov
2020-09-01 20:00 ` Peter Xu
2020-09-02 8:59 ` Vitaly Kuznetsov
2020-09-04 6:12 ` Sean Christopherson
2020-09-04 7:29 ` Gerd Hoffmann
2020-09-04 16:00 ` Sean Christopherson
2020-09-07 8:37 ` Vitaly Kuznetsov
2020-09-07 11:32 ` Michael S. Tsirkin
2020-09-11 17:00 ` Sean Christopherson
2020-09-18 12:34 ` Michael S. Tsirkin
2020-09-21 17:21 ` Sean Christopherson [this message]
2020-09-07 10:52 ` Michael S. Tsirkin
2020-09-18 9:33 ` Gerd Hoffmann
2020-09-07 10:54 ` Michael S. Tsirkin
2020-09-18 8:49 ` Gerd Hoffmann
2020-09-04 7:20 ` Gerd Hoffmann
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