From: linux-hyperv-owner@vger.kernel.org
[off-list ref] On Behalf Of Sasha Levin
Sent: Wednesday, January 29, 2020 4:06 PM
To: Dexuan Cui <decui@microsoft.com>
Cc: arnd@arndb.de; bp@alien8.de; daniel.lezcano@linaro.org; Haiyang Zhang
[off-list ref]; hpa@zytor.com; KY Srinivasan
[off-list ref]; linux-hyperv@vger.kernel.org;
linux-kernel@vger.kernel.org; mingo@redhat.com; Stephen Hemminger
[off-list ref]; tglx@linutronix.de; x86@kernel.org; Michael
Kelley [off-list ref]; Sasha Levin
[off-list ref]; vkuznets [off-list ref];
linux-arch@vger.kernel.org
Subject: Re: [PATCH v6][RESEND] x86/hyperv: Suspend/resume the hypercall
page for hibernation

On Sat, Jan 25, 2020 at 01:44:31AM +0000, Dexuan Cui wrote:

quoted

quoted

From: Dexuan Cui <decui@microsoft.com>
Sent: Monday, January 6, 2020 2:43 PM

This is needed for hibernation, e.g. when we resume the old kernel, we

need

quoted

quoted

to disable the "current" kernel's hypercall page and then resume the old
kernel's.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <redacted>
---

This is a RESEND of https://lkml.org/lkml/2019/11/20/68

Please review.

If it looks good, can you please pick it up through the tip.git tree?

 arch/x86/hyperv/hv_init.c | 48
+++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

Hi, Vitaly and x86 maintainers,
Can you please take a look at this patch?

Ping?

This patch has been floating around in it's current form for the past 2
months. I'll happily take Hyper-V patches under arch/x86/hyperv/ via the
Hyper-V tree rather than tip if the x86 folks don't want to deal with
them.

--
Thanks,
Sasha

This straightforward patch is the only pending patch for v5.6 for the
hibernation functionality of Linux VM on Hyper-V. It would be really great
if we could merge it for v5.6-rc1. The patch is safe in that it only runs when 
the VM hibernates, and the hibernation functionality of Linux VM on
Hyper-V never worked before. I'm pretty sure the patch can not cause any
merge conflict since nobody else tries to modify the file recently.

Thanks,
-- Dexuan