Hi George,
On 2020-04-03 08:27, George Cherian wrote:
Hi Marc,
On 2/11/20 9:48 AM, Marc Zyngier wrote:
This is a major rework of the NV series that I posted over 6 months
ago[1], and a lot has changed since then:
- Early ARMv8.4-NV support
- ARMv8.4-TTL support in host and guest
- ARMv8.5-GTG support in host and guest
- Lots of comments addressed after the review
- Rebased on v5.6-rc1
- Way too many patches
In my defence, the whole of the NV code is still smaller that the
32bit KVM/arm code I'm about to remove, so I feel less bad inflicting
this on everyone! ;-)
>From a functionality perspective, you can expect a L2 guest to work,
but don't even think of L3, as we only partially emulate the
ARMv8.{3,4}-NV extensions themselves. Same thing for vgic, debug, PMU,
as well as anything that would require a Stage-1 PTW. What we want to
achieve is that with NV disabled, there is no performance overhead and
no regression.
The series is roughly divided in 5 parts: exception handling, memory
virtualization, interrupts and timers for ARMv8.3, followed by the
ARMv8.4 support. There are of course some dependencies, but you'll
hopefully get the gist of it.
For the most courageous of you, I've put out a branch[2]. Of course,
you'll need some userspace. Andre maintains a hacked version of
kvmtool[3] that takes a --nested option, allowing the guest to be
started at EL2. You can run the whole stack in the Foundation
model. Don't be in a hurry ;-).
The full series was tested on both Foundation model as well as Marvell
ThunderX3
Emulation Platform.
Basic boot testing done for Guest Hypervisor and Guest Guest.
Tested-by: George Cherian <george.cherian@xxxxxxxxxxx>
Thanks for having given this a go.
However, without more details, it is pretty hard to find out what you
have tested.
What sort of guest have you booted, with what configuration, what
workloads did you
run in the L2 guests and what are the architectural features that TX3
implements?
The last point is specially important, as the NV architecture spans two
major
revisions of the architecture and affects tons of other extensions that
are
themselves optional. Without any detail on that front, I have no idea
what the
coverage of your testing is.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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