linux-kernel - RE: [PATCH 1/2] x86/hyper-v: check cpumask_to_vpset() return value in hyperv_flush_tlb_others

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Date:   Tue, 10 Jul 2018 19:38:06 +0000
From:   "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/2] x86/hyper-v: check cpumask_to_vpset() return value in
 hyperv_flush_tlb_others_ex()

From: Vitaly Kuznetsov <vkuznets@...hat.com> Monday, July 9, 2018 10:40 AM
> Commit 1268ed0c474a ("x86/hyper-v: Fix the circular dependency in IPI
> enlightenment") made cpumask_to_vpset() return '-1' when there is a CPU
> with unknown VP index in the supplied set. This needs to be checked before
> we pass 'nr_bank' to hypercall.
> 
> Fixes: 1268ed0c474a ("x86/hyper-v: Fix the circular dependency in IPI enlightenment")
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/hyperv/mmu.c | 2 ++
>  1 file changed, 2 insertions(+)

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>