linux-kernel - Re: [PATCH v2 3/4] mm: Change ghes code to allow poison of non-struct pfn

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Message-ID: <20231202232319.GAZWu8Z6gsLp1kI5Dw@fat_crate.local>
Date:   Sun, 3 Dec 2023 00:23:19 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     ankita@...dia.com
Cc:     jgg@...dia.com, alex.williamson@...hat.com,
        naoya.horiguchi@....com, akpm@...ux-foundation.org,
        tony.luck@...el.com, linmiaohe@...wei.com, rafael@...nel.org,
        lenb@...nel.org, james.morse@....com, shiju.jose@...wei.com,
        bhelgaas@...gle.com, pabeni@...hat.com, yishaih@...dia.com,
        shameerali.kolothum.thodi@...wei.com, kevin.tian@...el.com,
        aniketa@...dia.com, cjia@...dia.com, kwankhede@...dia.com,
        targupta@...dia.com, vsethi@...dia.com, acurrid@...dia.com,
        apopple@...dia.com, anuaggarwal@...dia.com, jhubbard@...dia.com,
        danw@...dia.com, mochs@...dia.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-edac@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 3/4] mm: Change ghes code to allow poison of
 non-struct pfn

On Thu, Nov 23, 2023 at 06:05:11AM +0530, ankita@...dia.com wrote:
> -	pfn = PHYS_PFN(physical_addr);
> -	if (!pfn_valid(pfn) && !arch_is_platform_page(physical_addr)) {
> -		pr_warn_ratelimited(FW_WARN GHES_PFX
> -		"Invalid address in generic error data: %#llx\n",
> -		physical_addr);
> -		return false;
> -	}

You don't just remove a pfn valid test just because your weird device
can't stomach it - you extend it, like

  3ad6fd77a2d6 ("x86/sgx: Add check for SGX pages to ghes_do_memory_failure()")

did, for example.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette