Re: [PATCH v2 1/4] conf: add xen specific feature: e820_host
On 4/13/20 8:37 PM, Marek Marczykowski-Górecki wrote:
e820_host is a Xen-specific option, only available for PV domains,
that
provides the domain a virtual e820 memory map based on the host one. It
is required when using PCI passthrough and is generally considered safe
for any PV kernel. e820_host is silently ignored if set in HVM domain
configuration. See xl.cfg(5) man page in the Xen documentation for more
details.
Signed-off-by: Marek Marczykowski-Górecki <marmarek(a)invisiblethingslab.com>
This looks good to me now so
Reviewed-by: Jim Fehlig <jfehlig(a)suse.com>
But before pushing I'd like to settle on mapping the new 'passthrough' xl.cfg
option to libvirt. See
https://www.redhat.com/archives/libvir-list/2020-April/msg00696.html
On xen 4.13 it seems 'passthrough' is enough for PV domains. Enabling it, and
not e820_host, allows me to successfully hotplug a PCI device after PV domain
creation. I haven't checked but I assume e820_host was needed to hotplug PCI
devices with xen < 4.13?
Regards,
Jim