From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Joao Martins <joao.m.martins@oracle.com>,
linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Juergen Gross <jgross@suse.com>,
Andy Lutomirski <luto@amacapital.net>
Subject: Re: [PATCH v6 3/4] x86/xen/time: setup vcpu 0 time info page
Date: Tue, 3 Oct 2017 08:53:01 -0400 [thread overview]
Message-ID: <fd939ed1-e919-bfbd-059b-26cf03589364@oracle.com> (raw)
In-Reply-To: <20171003115531.22546-4-joao.m.martins@oracle.com>
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@oracle.com>
> Reviewed-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovksy@oracle.com>
next prev parent reply other threads:[~2017-10-03 12:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-03 11:55 [PATCH v6 0/4] x86/xen: pvclock vdso support Joao Martins
2017-10-03 11:55 ` [PATCH v6 1/4] x86/pvclock: add setter for pvclock_pvti_cpu0_va Joao Martins
2017-10-17 15:34 ` Joao Martins
2017-10-19 13:40 ` Joao Martins
2017-10-03 11:55 ` [PATCH v6 2/4] x86/xen/time: set pvclock flags on xen_time_init() Joao Martins
2017-10-03 11:55 ` [PATCH v6 3/4] x86/xen/time: setup vcpu 0 time info page Joao Martins
2017-10-03 12:53 ` Boris Ostrovsky [this message]
2017-10-03 11:55 ` [PATCH v6 4/4] MAINTAINERS: xen, kvm: track pvclock-abi.h changes Joao Martins
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