From: boris.ostrovsky@oracle.com
To: Stefano Stabellini <sstabellini@kernel.org>,
linux-kernel@vger.kernel.org
Cc: Stefano Stabellini <stefano.stabellini@xilinx.com>,
Bertrand Marquis <Bertrand.Marquis@arm.com>,
jgross@suse.com
Subject: Re: [PATCH] xen/arm: do not setup the runstate info page if kpti is enabled
Date: Wed, 30 Sep 2020 10:13:39 -0400 [thread overview]
Message-ID: <4aca4d30-f418-bfab-8a9c-74f349f4ca02@oracle.com> (raw)
In-Reply-To: <20200924234955.15455-1-sstabellini@kernel.org>
On 9/24/20 7:49 PM, Stefano Stabellini wrote:
> From: Stefano Stabellini <stefano.stabellini@xilinx.com>
>
> The VCPUOP_register_runstate_memory_area hypercall takes a virtual
> address of a buffer as a parameter. The semantics of the hypercall are
> such that the virtual address should always be valid.
>
> When KPTI is enabled and we are running userspace code, the virtual
> address is not valid, thus, Linux is violating the semantics of
> VCPUOP_register_runstate_memory_area.
>
> Do not call VCPUOP_register_runstate_memory_area when KPTI is enabled.
>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
> CC: Bertrand Marquis <Bertrand.Marquis@arm.com>
> CC: boris.ostrovsky@oracle.com
> CC: jgross@suse.com
Applied to for-linus-5.10
-boris
prev parent reply other threads:[~2020-09-30 14:13 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-24 23:49 Stefano Stabellini
2020-09-25 15:08 ` Bertrand Marquis
2020-09-30 14:13 ` boris.ostrovsky [this message]
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