Re: [Xen-devel] [PATCH RFC 01/12] PVHv2 Dom0

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Hello,

Sorry, I've failed to Cc both Konrad and Boris on this...

On Fri, Jul 29, 2016 at 06:28:55PM +0200, Roger Pau Monne wrote:
> Hello,
> 
> This is a very rough implementation of a PVHv2 Dom0. There are still a bunch 
> of things that will not work properly (like SR-IOV, MSI, MSI-X...), but it 
> *should* be able to boot a Dom0 kernel and it doesn't require using PIRQs.
> 
> There are some changes compared to a traditional PV or PVH Dom0:
> 
>  - An emulated local APIC (for each vCPU) and IO APIC is provided to Dom0.
>  - At the start of day only the low 1MB and the ACPI e820 regions are mapped 
>    into the guest using 1:1 mappings (for UEFI systems mapping the low 1MB 
>    probably doesn't make any sense, but alas).
>  - The MADT has been replaced in order to reflect the real topology seen by 
>    Dom0.
>  - In order to have the BARs of PCI devices mapped Dom0 must call 
>    PHYSDEVOP_pci_device_add. See the notes on patch 11 for more information 
>    (and what's missing).
>  - ATM only legacy PCI interrupts are supported. This is implemented by 
>    looking at the writes Dom0 makes to the emulated IO APIC and translating 
>    them into the real hardware. Note that MSI or MSI-X capabilities are 
>    _not_ masked from the PCI capabilities list, so the user must avoid using
>    them.
>  - PCIe Enhanced Configuration Mechanism regions are not yet mapped into 
>    Dom0 physmap.
>  - Some ACPI tables are zapped (it's signature is inverted) to prevent Dom0 
>    from poking at them, those are: HPET, SLIT, SRAT, MPST and PMTT.
> 
> This is still very experimental, I've been able to boot a FreeBSD Dom0 using 
> 2GB and 4GB of memory assigned to it, but if I try to use 6GB Xen gets a NMI 
> (I've got no idea why yet). I don't think it's worth delaying this more, 
> because it's going to take me some time to finish all this work (MSI, 
> MSI-X, bug hunting...), and in the meantime people can already take a look 
> at what's done (or half-done).
> 
> I've pushed the whole series to my git repository:
> 
> git://xenbits.xen.org/people/royger/xen.git pvhv2_dom0_rfc
> 
> It contains two patches from Boris and Anthony, that are a pre-requisite to 
> this series.
> 
> As usual, thanks for taking the time to look into it, hope it doesn't make 
> your eyes bleed much (slight bleeding is expected).
> 
> Roger.
> 
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