linux-kernel - Re: [RFC PATCH v2 4/6] KVM: gmem: Add ioctl to inject memory failure on guest memfd

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Date:   Thu, 21 Sep 2023 14:53:17 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     isaku.yamahata@...el.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        isaku.yamahata@...il.com, Michael Roth <michael.roth@....com>,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sagi Shahar <sagis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        linux-coco@...ts.linux.dev,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Ackerley Tng <ackerleytng@...gle.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Yuan Yao <yuan.yao@...ux.intel.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Xu Yilun <yilun.xu@...el.com>,
        Quentin Perret <qperret@...gle.com>, wei.w.wang@...el.com,
        Fuad Tabba <tabba@...gle.com>
Subject: Re: [RFC PATCH v2 4/6] KVM: gmem: Add ioctl to inject memory failure
 on guest memfd

On Thu, Sep 21, 2023, isaku.yamahata@...el.com wrote:
> +	if (!pfn_valid(pfn))
> +		return -ENXIO;
> +	return memory_failure(pfn, MF_SW_SIMULATED);

memory_failure is defined iff CONFIG_MEMORY_FAILURE=y.  All of this code would
need to be conditioned on that (in addition to the injection configs).

address_space_operations.error_remove_page() arguably should be conditioned on
that as well, but that's a much bigger change and not a problem that needs to be
solved anytime soon.