Re: [Xen-devel] [PATCH v4 4/8] monitor: ARM SMC events

[Tamas K Lengyel <tamas@xxxxxxxxxxxxx>]

On Jun 1, 2016 05:37, "Julien Grall" <julien.grall@xxxxxxx> wrote:
>
> Hi Tamas,
>
>
> On 29/05/16 23:37, Tamas K Lengyel wrote:
>>
>> Add support for monitoring ARM SMC events. This patch only adds the required
>> bits to enable/disable monitoring and forwarding the event through vm_event.
>
>
> Couple of questions:
>
> - How the vm-event app will differentiate a SMC64 vs a SMC32 call?

Wouldn't cpsr record the guest state when the smc was executed, telling us whether it was 32bit or 64bit?

> - How the vm-event app will know the SMC number (i.e the
>
> In an AArch64 state, those informations are available from the syndrome register (HSR_EL2.ISS).

Good question, it should probably be sent alongside the other registers. At the moment my usecase doesn't care about it as I'm just using SMC for inducing traps to the vmm but other applications may indeed need this.

Tamas

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