linux-kernel - Re: [Patch v4 07/13] swiotlb: Remove bounce buffer remapping for Hyper-V

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Date:   Mon, 9 Jan 2023 19:05:27 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     hpa@...or.com, kys@...rosoft.com, haiyangz@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, luto@...nel.org,
        peterz@...radead.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, lpieralisi@...nel.org,
        robh@...nel.org, kw@...ux.com, bhelgaas@...gle.com, arnd@...db.de,
        hch@...radead.org, m.szyprowski@...sung.com, robin.murphy@....com,
        thomas.lendacky@....com, brijesh.singh@....com, tglx@...utronix.de,
        mingo@...hat.com, dave.hansen@...ux.intel.com,
        Tianyu.Lan@...rosoft.com, kirill.shutemov@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, ak@...ux.intel.com,
        isaku.yamahata@...el.com, dan.j.williams@...el.com,
        jane.chu@...cle.com, seanjc@...gle.com, tony.luck@...el.com,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
        iommu@...ts.linux.dev
Subject: Re: [Patch v4 07/13] swiotlb: Remove bounce buffer remapping for
 Hyper-V

On Thu, Dec 01, 2022 at 07:30:25PM -0800, Michael Kelley wrote:
> With changes to how Hyper-V guest VMs flip memory between private
> (encrypted) and shared (decrypted), creating a second kernel virtual
> mapping for shared memory is no longer necessary. Everything needed
> for the transition to shared is handled by set_memory_decrypted().
> 
> As such, remove swiotlb_unencrypted_base and the associated
> code.
> 
> Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
> Acked-by: Christoph Hellwig <hch@....de>
> ---
>  arch/x86/kernel/cpu/mshyperv.c |  7 +------
>  include/linux/swiotlb.h        |  2 --
>  kernel/dma/swiotlb.c           | 45 +-----------------------------------------
>  3 files changed, 2 insertions(+), 52 deletions(-)

Patches removing crap are always nice:

Acked-by: Borislav Petkov (AMD) <bp@...en8.de>

-- 
Regards/Gruss,
    Boris.

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