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Re: [Xen-devel] [PATCH] arm/monitor: flush the icache during SMC traps



Hi Stefano,

On 27/01/2017 19:27, Stefano Stabellini wrote:
On Thu, 26 Jan 2017, Tamas K Lengyel wrote:
On Thu, Jan 26, 2017 at 10:54 AM, Tamas K Lengyel
<tamas.lengyel@xxxxxxxxxxxx> wrote:
On Thu, Jan 26, 2017 at 4:30 AM, Julien Grall <julien.grall@xxxxxxx> wrote:
So according to the manual (C5.3.9-10) IALLU and IALLUIS are not
available from EL0. IVAU can be enabled to execute in EL0; however on
my 4.1 kernel it generates a permission fault. I'm also not sure if
IVAU would actually be a solution.

I think there is a Linux syscall available for this kind of things,
called cacheflush. See arch/arm/kernel/traps.c:arm_syscall.

The cacheflush system is only implement on ARM32. And even thought, we have a domctl cacheflush for this purpose.

Cheers,

--
Julien Grall

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