linux-kernel - Re: [PATCH v6 3/4] x86/xen/time: setup vcpu 0 time info page

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <fd939ed1-e919-bfbd-059b-26cf03589364@oracle.com>
Date:   Tue, 3 Oct 2017 08:53:01 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Joao Martins <joao.m.martins@...cle.com>,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Juergen Gross <jgross@...e.com>,
        Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH v6 3/4] x86/xen/time: setup vcpu 0 time info page



On 10/03/2017 07:55 AM, Joao Martins wrote:
> In order to support pvclock vdso on xen we need to setup the time
> info page for vcpu 0 and register the page with Xen using the
> VCPUOP_register_vcpu_time_memory_area hypercall. This hypercall
> will also forcefully update the pvti which will set some of the
> necessary flags for vdso. Afterwards we check if it supports the
> PVCLOCK_TSC_STABLE_BIT flag which is mandatory for having
> vdso/vsyscall support. And if so, it will set the cpu 0 pvti that
> will be later on used when mapping the vdso image.
>
> The xen headers are also updated to include the new hypercall for
> registering the secondary vcpu_time_info struct.
>
> Signed-off-by: Joao Martins <joao.m.martins@...cle.com>
> Reviewed-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovksy@...cle.com>