linux-kernel - Re: [RFC PATCH v2 0/7] Introduce persistent memory pool

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Message-ID: <ee1907a1-2f04-cfa3-9f09-75b94994e88b@intel.com>
Date:   Thu, 28 Sep 2023 06:22:54 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>,
        Baoquan He <bhe@...hat.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        ebiederm@...ssion.com, akpm@...ux-foundation.org,
        stanislav.kinsburskii@...il.com, corbet@....net,
        linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        linux-mm@...ck.org, kys@...rosoft.com, jgowans@...zon.com,
        wei.liu@...nel.org, arnd@...db.de, gregkh@...uxfoundation.org,
        graf@...zon.de, pbonzini@...hat.com
Subject: Re: [RFC PATCH v2 0/7] Introduce persistent memory pool

On 9/27/23 09:13, Stanislav Kinsburskii wrote:
> Once deposited, these pages can't be accessed by Linux anymore and thus
> must be preserved in "used" state across kexec, as hypervisor state is
> unware of kexec.

If Linux can't access them, they're not RAM any more.  I'd much rather
remove them from the memory map and move on with life rather than
implement a bunch of new ABI that's got to be handed across kernels.