From: Matthew Wilcox <willy@infradead.org>
To: Julia Suvorova <jusual@redhat.com>
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Bjorn Helgaas <bhelgaas@google.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: Re: [PATCH] x86/PCI: Use MMCONFIG by default for KVM guests
Date: Wed, 22 Jul 2020 03:59:12 +0100 [thread overview]
Message-ID: <20200722025912.GM15516@casper.infradead.org> (raw)
In-Reply-To: <20200722001513.298315-1-jusual@redhat.com>
On Wed, Jul 22, 2020 at 02:15:13AM +0200, Julia Suvorova wrote:
> @@ -264,6 +265,10 @@ void __init pci_direct_init(int type)
> {
> if (type == 0)
> return;
> +
> + if (raw_pci_ext_ops && kvm_para_available())
> + return;
This is a bit of a subtle way of saying "If mmconfig exists, don't use
the cf8 mechanism". There's probably a better way of doing this, but
the x86 pci init sequence is already byzantine and I don't understand it
well enough to offer you an alternative.
next prev parent reply other threads:[~2020-07-22 2:59 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-22 0:15 Julia Suvorova
2020-07-22 2:59 ` Matthew Wilcox [this message]
2020-07-22 9:43 ` Vitaly Kuznetsov
2020-07-26 18:35 ` Julia Suvorova
2020-07-27 14:04 ` Andy Shevchenko
2020-07-27 15:55 ` Vitaly Kuznetsov
2020-07-22 10:59 ` Michael S. Tsirkin
2020-07-22 23:19 ` Bjorn Helgaas
2020-07-26 18:58 ` Julia Suvorova
2020-07-29 14:43 ` Michael S. Tsirkin
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