linux-kernel - Re: [PATCH v7] swiotlb: Adjust SWIOTBL bounce buffer size for SEV guests.

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Date:   Mon, 7 Dec 2020 23:33:07 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     "Kalra, Ashish" <Ashish.Kalra@....com>
Cc:     "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
        "hch@....de" <hch@....de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "luto@...nel.org" <luto@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "dave.hansen@...ux-intel.com" <dave.hansen@...ux-intel.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Singh, Brijesh" <brijesh.singh@....com>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        "Grimm, Jon" <Jon.Grimm@....com>,
        "rientjes@...gle.com" <rientjes@...gle.com>
Subject: Re: [PATCH v7] swiotlb: Adjust SWIOTBL bounce buffer size for SEV
 guests.

On Mon, Dec 07, 2020 at 10:20:20PM +0000, Kalra, Ashish wrote:
> It is more of an approximation of the earlier static adjustment which
> was 128M for <1G guests, 256M for 1G-4G guests and 512M for >4G
> guests.

Makes sense and it is better than nothing. Please put that explanation
over the 6% define.

-- 
Regards/Gruss,
    Boris.

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