netdev - Re: [PATCH 07/12] Drivers: hv: vmbus: Remove second mapping of VMBus monitor pages

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Date:   Thu, 3 Nov 2022 22:27:28 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Michael Kelley <mikelley@...rosoft.com>, hpa@...or.com,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...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, bp@...en8.de, 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 07/12] Drivers: hv: vmbus: Remove second mapping of VMBus
 monitor pages

On 10/21/2022 1:57 AM, 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 the code to create and manage the second
> mapping for VMBus monitor pages. Because set_memory_decrypted()
> and set_memory_encrypted() are no-ops in normal VMs, it's
> not even necessary to test for being in a Confidential VM
> (a.k.a., "Isolation VM").
> 
> Signed-off-by: Michael Kelley<mikelley@...rosoft.com>

Reviewed-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>