From: Julien Grall <julien.grall@arm.com>
To: Wei Chen <Wei.Chen@arm.com>, xen-devel@lists.xen.org
Cc: Kaly.Xin@arm.com, nd@arm.com, sstabellini@kernel.org,
steve.capper@arm.com
Subject: Re: [PATCH v2 07/19] xen/arm: Introduce a virtual abort injection helper
Date: Thu, 30 Mar 2017 18:20:44 +0100 [thread overview]
Message-ID: <dc9d3a51-c94d-e60c-63a2-bae4fffe9af5@arm.com> (raw)
In-Reply-To: <1490865209-18283-8-git-send-email-Wei.Chen@arm.com>
Hi Wei,
On 30/03/17 10:13, Wei Chen wrote:
> When guest triggers async aborts, in most platform, such aborts
> will be routed to hypervisor. But we don't want the hypervisor
> to handle such aborts, so we have to route such aborts back to
> the guest.
>
> This helper is using the HCR_EL2.VSE (HCR.VA for aarch32) bit to
> route such aborts back to the guest. If the guest PC had been
> advanced by SVC/HVC/SMC instructions before we caught the SError
> in hypervisor, we have to adjust the guest PC to exact address
> while the SError generated.
>
> About HSR_EC_SVC32/64, even thought we don't trap SVC32/64 today,
> we would like them to be handled here. This would be useful when
> VM introspection will gain support of SVC32/64 trapping.
>
> This helper will be used by the later patches in this series, we
> use #if 0 to disable it in this patch temporarily to remove the
> warning message of unused function from compiler.
>
> Signed-off-by: Wei Chen <Wei.Chen@arm.com>
> Acked-by: Stefano Stabellini <sstabellini@kernel.org>
> ---
> v1->v2:
> 1. After updating HCR_EL2.VSE bit of vCPU HCR_EL2, write the value
> to HCR_EL2 immediately. In this case we don't need to move the
> restoration of HCR_EL2 to leave_hypervisor_tail, and it worked
> regardless of whether we get preempted.
This should have been explained in the commit message and ...
> 2. Add Stefano's Acked-by.
I would not keep Acked-by/Reviewed-by with a change like above. Or at
least, I would ask whether they are fine with this change.
Cheers,
--
Julien Grall
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next prev parent reply other threads:[~2017-03-30 17:20 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-30 9:13 [PATCH v2 00/19] Provide a command line option to choose how to handle SErrors Wei Chen
2017-03-30 9:13 ` [PATCH v2 01/19] xen/arm: Save ESR_EL2 to avoid using mismatched value in syndrome check Wei Chen
2017-03-30 13:31 ` Julien Grall
2017-03-31 3:26 ` Wei Chen
2017-03-30 9:13 ` [PATCH v2 02/19] xen/arm: Remove vwfi while setting HCR_EL2 in init_traps Wei Chen
2017-03-30 17:05 ` Julien Grall
2017-03-30 22:29 ` Stefano Stabellini
2017-03-31 5:58 ` Wei Chen
2017-03-31 8:34 ` Julien Grall
2017-03-30 9:13 ` [PATCH v2 03/19] xen/arm: Move parse_vwfi from trap.c to domain.c Wei Chen
2017-03-30 9:13 ` [PATCH v2 04/19] xen/arm: Restore HCR_EL2 register Wei Chen
2017-03-30 17:07 ` Julien Grall
2017-03-30 22:03 ` Stefano Stabellini
2017-03-31 2:10 ` Wei Chen
2017-03-31 8:39 ` Julien Grall
2017-03-31 8:59 ` Wei Chen
2017-03-30 9:13 ` [PATCH v2 05/19] xen/arm: Avoid setting/clearing HCR_RW at every context switch Wei Chen
2017-03-30 17:12 ` Julien Grall
2017-03-30 21:21 ` Stefano Stabellini
2017-03-30 9:13 ` [PATCH v2 06/19] xen/arm: Save HCR_EL2 when a guest took the SError Wei Chen
2017-03-30 9:13 ` [PATCH v2 07/19] xen/arm: Introduce a virtual abort injection helper Wei Chen
2017-03-30 17:20 ` Julien Grall [this message]
2017-03-30 21:24 ` Stefano Stabellini
2017-03-31 5:25 ` Wei Chen
2017-03-30 9:13 ` [PATCH v2 08/19] xen/arm: Introduce a command line parameter for SErrors/Aborts Wei Chen
2017-03-30 17:39 ` Julien Grall
2017-03-31 5:28 ` Wei Chen
2017-03-30 9:13 ` [PATCH v2 09/19] xen/arm: Introduce a initcall to update cpu_hwcaps by serror_op Wei Chen
2017-03-30 17:51 ` Julien Grall
2017-03-30 18:02 ` Julien Grall
2017-03-30 21:28 ` Stefano Stabellini
2017-03-31 8:50 ` Julien Grall
2017-03-30 9:13 ` [PATCH v2 10/19] xen/arm64: Use alternative to skip the check of pending serrors Wei Chen
2017-03-30 9:13 ` [PATCH v2 11/19] xen/arm32: " Wei Chen
2017-03-30 18:06 ` Julien Grall
2017-03-30 21:29 ` Stefano Stabellini
2017-03-31 5:33 ` Wei Chen
2017-03-30 9:13 ` [PATCH v2 12/19] xen/arm: Move macro VABORT_GEN_BY_GUEST to common header Wei Chen
2017-03-30 21:36 ` Stefano Stabellini
2017-03-31 5:35 ` Wei Chen
2017-03-30 9:13 ` [PATCH v2 13/19] xen/arm: Introduce new helpers to handle guest/hyp SErrors Wei Chen
2017-03-30 9:13 ` [PATCH v2 14/19] xen/arm: Replace do_trap_guest_serror with new helpers Wei Chen
2017-03-30 9:13 ` [PATCH v2 15/19] xen/arm: Unmask the Abort/SError bit in the exception entries Wei Chen
2017-03-30 9:13 ` [PATCH v2 16/19] xen/arm: Introduce a helper to synchronize SError Wei Chen
2017-03-30 18:28 ` Julien Grall
2017-03-30 18:32 ` Julien Grall
2017-03-30 18:37 ` Julien Grall
2017-03-31 5:51 ` Wei Chen
2017-03-31 10:55 ` Wei Chen
2017-03-31 11:06 ` Julien Grall
2017-03-31 11:09 ` Wei Chen
2017-03-30 9:13 ` [PATCH v2 17/19] xen/arm: Isolate the SError between the context switch of 2 vCPUs Wei Chen
2017-03-30 21:49 ` Stefano Stabellini
2017-03-30 22:00 ` Julien Grall
2017-03-31 5:52 ` Wei Chen
2017-03-30 9:13 ` [PATCH v2 18/19] xen/arm: Prevent slipping hypervisor SError to guest Wei Chen
2017-03-30 9:13 ` [PATCH v2 19/19] xen/arm: Handle guest external abort as guest SError Wei Chen
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