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Message-ID: <f295f2f4-b7c7-0faf-cc99-9a052a7bf7ef@gmail.com>
Date:   Thu, 3 Nov 2022 22:27:28 +0800
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Subject: Re: [PATCH 07/12] Drivers: hv: vmbus: Remove second mapping of VMBus
 monitor pages
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To:     Michael Kelley <mikelley@microsoft.com>, hpa@zytor.com,
        kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com,
        wei.liu@kernel.org, decui@microsoft.com, luto@kernel.org,
        peterz@infradead.org, davem@davemloft.net, edumazet@google.com,
        kuba@kernel.org, pabeni@redhat.com, lpieralisi@kernel.org,
        robh@kernel.org, kw@linux.com, bhelgaas@google.com, arnd@arndb.de,
        hch@infradead.org, m.szyprowski@samsung.com, robin.murphy@arm.com,
        thomas.lendacky@amd.com, brijesh.singh@amd.com, tglx@linutronix.de,
        mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
        Tianyu.Lan@microsoft.com, kirill.shutemov@linux.intel.com,
        sathyanarayanan.kuppuswamy@linux.intel.com, ak@linux.intel.com,
        isaku.yamahata@intel.com, dan.j.williams@intel.com,
        jane.chu@oracle.com, seanjc@google.com, tony.luck@intel.com,
        x86@kernel.org, linux-kernel@vger.kernel.org,
        linux-hyperv@vger.kernel.org, netdev@vger.kernel.org,
        linux-pci@vger.kernel.org, linux-arch@vger.kernel.org,
        iommu@lists.linux.dev
References: <1666288635-72591-1-git-send-email-mikelley@microsoft.com>
 <1666288635-72591-8-git-send-email-mikelley@microsoft.com>
From:   Tianyu Lan <ltykernel@gmail.com>
In-Reply-To: <1666288635-72591-8-git-send-email-mikelley@microsoft.com>
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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@microsoft.com>

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