linux-kernel - [PATCH 0/2] x86/hyper-v: cope with VP

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Message-Id: <20180709174012.17429-1-vkuznets@redhat.com>
Date:   Mon,  9 Jul 2018 19:40:10 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     x86@...nel.org
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>,
        devel@...uxdriverproject.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] x86/hyper-v: cope with VP_INVAL in PV TLB flush code

Commit 1268ed0c474a ("x86/hyper-v: Fix the circular dependency in IPI
 enlightenment") made it possible to observe VP_INVAL returned from 
hv_cpu_number_to_vp_number() and cpumask_to_vpset() and PV TLB flush
code needs to be adjusted.

The window when VP_INVAL is observable is very short, I'm not even sure
we do TLB flushes during this period (secodary CPUs bringup on boot, there
is no CPU hotplug on Hyper-V yet). This, however, may change in future so
let's fix this now.

Thomas, Ingo: these patches are for 'tip/x86/hyperv'. I don't think we have
a real issue in 4.18 but I can definitely prepare fixes for it if you think
this is needed.

Vitaly Kuznetsov (2):
  x86/hyper-v: check cpumask_to_vpset() return value in
    hyperv_flush_tlb_others_ex()
  x86/hyper-v: check for VP_INVAL in hyperv_flush_tlb_others()

 arch/x86/hyperv/mmu.c | 7 +++++++
 1 file changed, 7 insertions(+)

-- 
2.14.4