From: Juergen Gross <jgross@suse.com>
To: Zhenzhong Duan <zhenzhong.duan@oracle.com>, linux-kernel@vger.kernel.org
Cc: sstabellini@kernel.org, peterz@infradead.org,
Jan Kiszka <jan.kiszka@siemens.com>,
mingo@kernel.org, Ingo Molnar <mingo@redhat.com>,
bp@alien8.de, hpa@zytor.com, xen-devel@lists.xenproject.org,
boris.ostrovsky@oracle.com, srinivas.eeda@oracle.com,
tglx@linutronix.de
Subject: Re: [Xen-devel] [PATCH v2 3/7] x86: Add nopv parameter to disable PV extensions
Date: Wed, 26 Jun 2019 11:38:39 +0200 [thread overview]
Message-ID: <23b5bdee-f6b8-609b-2a52-d0b8c10a8ff8@suse.com> (raw)
In-Reply-To: <1561377779-28036-4-git-send-email-zhenzhong.duan@oracle.com>
On 24.06.19 14:02, Zhenzhong Duan wrote:
> In virtualization environment, PV extensions (drivers, interrupts,
> timers, etc) are enabled in the majority of use cases which is the
> best option.
>
> However, in some cases (kexec not fully working, benchmarking)
> we want to disable PV extensions. As such introduce the
> 'nopv' parameter that will do it.
>
> There are guest types which just won't work without PV extensions,
> like Xen PV, Xen PVH and jailhouse. add a "ignore_nopv" member to
> struct hypervisor_x86 set to true for those guest types and call
> the detect functions only if nopv is false or ignore_nopv is true.
>
> There is already 'xen_nopv' parameter for XEN platform but not for
> others. 'xen_nopv' can then be removed with this change.
>
> Suggested-by: Juergen Gross <jgross@suse.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Borislav Petkov <bp@alien8.de>
> Cc: Jan Kiszka <jan.kiszka@siemens.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> Cc: Stefano Stabellini <sstabellini@kernel.org>
> Cc: xen-devel@lists.xenproject.org
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
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next prev parent reply other threads:[~2019-06-26 9:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1561377779-28036-1-git-send-email-zhenzhong.duan@oracle.com>
2019-06-24 12:02 ` [Xen-devel] [PATCH v2 3/7] x86: Add nopv parameter to disable PV extensions Zhenzhong Duan
2019-06-26 9:38 ` Juergen Gross [this message]
2019-06-24 12:02 ` [Xen-devel] [PATCH v2 4/7] Revert "xen: Introduce 'xen_nopv' to disable PV extensions for HVM guests." Zhenzhong Duan
2019-06-26 9:39 ` Juergen Gross
2019-06-26 13:48 ` Thomas Gleixner
2019-06-24 12:02 ` [Xen-devel] [PATCH v2 5/7] x86/xen: nopv parameter support for HVM guest Zhenzhong Duan
2019-06-25 12:31 ` Juergen Gross
2019-06-26 8:56 ` Zhenzhong Duan
2019-06-26 9:03 ` Juergen Gross
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