From: Julien Grall <julien.grall@arm.com>
To: Tamas K Lengyel <tamas@tklengyel.com>
Cc: Xen-devel <xen-devel@lists.xenproject.org>,
Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: [PATCH v4 4/8] monitor: ARM SMC events
Date: Thu, 2 Jun 2016 15:23:52 +0100 [thread overview]
Message-ID: <57504178.40405@arm.com> (raw)
In-Reply-To: <CABfawhmLVQ778o+W3GP=LWkK+u35r3Ek5S1hLUL0gTF98ODouw@mail.gmail.com>
Hello Tamas,
On 01/06/16 16:41, Tamas K Lengyel wrote:
>
> On Jun 1, 2016 05:37, "Julien Grall" <julien.grall@arm.com
> <mailto:julien.grall@arm.com>> wrote:
> > 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?
You are right.
> > - 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.
In this case, we should either provide HSR_EL2, or decode it provide the
value.
Note that HSR_EL2.ISS is unknown for ARMv7 (see B3-1431 in ARM DDI 0406C.c).
On ARMv8, ESR_EL2.ISS has a different encoding depending on the state
(i.e AArch64 or AArch32). See D7-1861 in ARM DDI 0487A.i. Furthermore,
in AArch32 state, the ARMv8 specs permits to trap conditional SMC
instructions that fail their condition check (see D7-1897 in ARM DDI
0406C.c).
So I guess, this need to be abstract in Xen to avoid burden to the
introspection app.
Regards,
--
Julien Grall
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next prev parent reply other threads:[~2016-06-02 14:23 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-29 22:37 [PATCH v4 1/8] monitor: Rename vm_event_monitor_get_capabilities Tamas K Lengyel
2016-05-29 22:37 ` [PATCH v4 2/8] monitor: Rename vm_event_monitor_guest_request Tamas K Lengyel
2016-05-30 7:05 ` Razvan Cojocaru
2016-05-30 13:51 ` Jan Beulich
2016-05-29 22:37 ` [PATCH v4 3/8] monitor: Rename hvm/event to hvm/monitor Tamas K Lengyel
2016-05-30 7:08 ` Razvan Cojocaru
2016-05-30 13:53 ` Jan Beulich
2016-05-29 22:37 ` [PATCH v4 4/8] monitor: ARM SMC events Tamas K Lengyel
2016-06-01 11:37 ` Julien Grall
[not found] ` <CABfawhmO9tUG3-OcorfwqdOgZTkjoUk+u=dHySGonBDvobqyKw@mail.gmail.com>
[not found] ` <CABfawhmK2GAmQqZMhrgjYzeUZ_XaoyRUPuJxyPK5LJEHwsp5SA@mail.gmail.com>
[not found] ` <CABfawh=J1fwinTYKGvJNrFPOsGLSXz6U3GE8fxPz3-KsXSWfbQ@mail.gmail.com>
[not found] ` <CABfawhn7zvE=hn0hq1ryH+sW-jdkAXgZM1C2KxwZVUE8pbp8cQ@mail.gmail.com>
2016-06-01 15:41 ` Tamas K Lengyel
2016-06-02 14:23 ` Julien Grall [this message]
2016-06-02 22:31 ` Tamas K Lengyel
2016-07-04 19:13 ` Tamas K Lengyel
2016-07-04 20:02 ` Julien Grall
2016-07-04 21:05 ` Tamas K Lengyel
2016-07-05 9:58 ` Julien Grall
2016-05-29 22:37 ` [PATCH v4 5/8] arm/vm_event: get/set registers Tamas K Lengyel
2016-05-30 7:09 ` Razvan Cojocaru
2016-05-30 11:50 ` Jan Beulich
2016-05-30 19:47 ` Tamas K Lengyel
2016-05-30 20:20 ` Julien Grall
2016-05-30 20:37 ` Tamas K Lengyel
2016-05-30 20:46 ` Razvan Cojocaru
2016-05-30 20:53 ` Tamas K Lengyel
2016-05-30 21:35 ` Julien Grall
2016-05-30 21:41 ` Tamas K Lengyel
2016-05-31 7:54 ` Jan Beulich
2016-05-31 8:06 ` Razvan Cojocaru
2016-05-31 8:30 ` Jan Beulich
2016-05-31 16:20 ` Tamas K Lengyel
2016-05-31 7:48 ` Jan Beulich
2016-05-31 16:28 ` Tamas K Lengyel
2016-06-01 8:41 ` Jan Beulich
2016-06-01 11:24 ` Julien Grall
2016-06-01 18:21 ` Tamas K Lengyel
2016-06-01 19:34 ` Razvan Cojocaru
2016-06-01 19:43 ` Julien Grall
2016-06-02 7:35 ` Jan Beulich
2016-06-02 8:26 ` Razvan Cojocaru
2016-06-02 9:38 ` Jan Beulich
2016-06-02 9:42 ` Razvan Cojocaru
2016-06-01 19:38 ` Julien Grall
2016-06-01 19:49 ` Julien Grall
2016-06-01 19:50 ` Tamas K Lengyel
2016-05-29 22:37 ` [PATCH v4 6/8] tools/libxc: add xc_monitor_privileged_call Tamas K Lengyel
2016-05-29 22:37 ` [PATCH v4 7/8] tools/xen-access: add test-case for ARM SMC Tamas K Lengyel
2016-05-30 9:56 ` Wei Liu
2016-05-29 22:37 ` [PATCH v4 8/8] x86/vm_event: Add HVM debug exception vm_events Tamas K Lengyel
2016-05-30 7:29 ` Razvan Cojocaru
2016-05-30 14:16 ` Jan Beulich
2016-05-30 20:13 ` Tamas K Lengyel
2016-05-30 20:58 ` Andrew Cooper
2016-05-31 7:59 ` Jan Beulich
2016-06-01 21:46 ` Tamas K Lengyel
2016-06-01 22:17 ` Andrew Cooper
2016-06-02 0:01 ` Tamas K Lengyel
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