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Re: [qemu-s390x] [Qemu-devel] [RFC PATCH 1/3] hw/Kconfig: PCI bus implie

From: Paolo Bonzini
Subject: Re: [qemu-s390x] [Qemu-devel] [RFC PATCH 1/3] hw/Kconfig: PCI bus implies PCI_DEVICES
Date: Wed, 17 Jul 2019 17:04:54 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2

On 17/07/19 16:54, Collin Walling wrote:
> PCI host plugging will check for the MSI-X capability on the
> PCI device. If the MSI-X cap is missing, we fail device plugging.
> We do not check for MSI. Only MSI-X.
> Specifically, the capability is represented by PCI_CAP_ID_MSIX
> in pci_regs.h

The code in Linux says that single MSIs are supported too:

       if (type == PCI_CAP_ID_MSI && nvec > 1)
               return 1;


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