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Subject: Re: [PATCH] Revert "KVM: Check the allocation of pv cpu mask"
To:     Vitaly Kuznetsov <vkuznets@redhat.com>, kvm@vger.kernel.org,
        Paolo Bonzini <pbonzini@redhat.com>
Cc:     Sean Christopherson <sean.j.christopherson@intel.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Haiwei Li <lihaiwei@tencent.com>, linux-kernel@vger.kernel.org,
        x86@kernel.org
References: <20200916090342.748452-1-vkuznets@redhat.com>
From:   Haiwei Li <lihaiwei.kernel@gmail.com>
Message-ID: <6c2204ad-590b-025d-f728-0e6e67bf24ba@gmail.com>
Date:   Wed, 16 Sep 2020 17:29:59 +0800
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On 20/9/16 17:03, Vitaly Kuznetsov wrote:
> The commit 0f990222108d ("KVM: Check the allocation of pv cpu mask") we
> have in 5.9-rc5 has two issue:
> 1) Compilation fails for !CONFIG_SMP, see:
>     https://bugzilla.kernel.org/show_bug.cgi?id=209285
> 
> 2) This commit completely disables PV TLB flush, see
>     https://lore.kernel.org/kvm/87y2lrnnyf.fsf@vitty.brq.redhat.com/
> 
> The allocation problem is likely a theoretical one, if we don't
> have memory that early in boot process we're likely doomed anyway.
> Let's solve it properly later.

Hi, i have sent a patchset to fix this commit.

https://lore.kernel.org/kvm/20200914091148.95654-1-lihaiwei.kernel@gmail.com/T/#m6c27184012ee5438e5d91c09b1ba1b6a3ee30ee4

What do you think?

Haiwei Li