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Re: [Qemu-devel] [PATCH 00/10] target/arm: Some pieces of support for 32

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH 00/10] target/arm: Some pieces of support for 32-bit Hyp mode
Date: Wed, 15 Aug 2018 12:13:14 +0100

On 15 August 2018 at 12:04, Edgar E. Iglesias <address@hidden> wrote:
> On Tue, Aug 14, 2018 at 01:42:44PM +0100, Peter Maydell wrote:
>> I also noticed that we fail to implement really quite a lot
>> of the HCR_EL2 trap semantics for either AArch64 or AArch32,
>> to the extent that I'm surprised that nested guests work
>> under AArch64 :-)
> Yes, we've have an entry for a while in our TODO list to improve
> HCR trapping but haven't gotten around to it. IIRC, at the time
> when we where bringing the EL2 stuff up, quite little was actually
> being used by KVM/Xen.

We're also I think not correctly implementing some of
the required upgrades of TLB maintenance ops to inner-shareable,
so I suspect that operation in SMP configs will be flaky.

-- PMM

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