linux-kernel - Re: [PATCH V9 0/9] x86/Hyper-V: Add Hyper-V Isolation VM support(First part)

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Date:   Mon, 25 Oct 2021 20:55:59 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Tianyu Lan <ltykernel@...il.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        davem@...emloft.net, kuba@...nel.org, gregkh@...uxfoundation.org,
        arnd@...db.de, brijesh.singh@....com, jroedel@...e.de,
        Tianyu.Lan@...rosoft.com, thomas.lendacky@....com,
        pgonda@...gle.com, akpm@...ux-foundation.org,
        kirill.shutemov@...ux.intel.com, rppt@...nel.org, tj@...nel.org,
        aneesh.kumar@...ux.ibm.com, saravanand@...com,
        sfr@...b.auug.org.au, michael.h.kelley@...rosoft.com,
        linux-arch@...r.kernel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        vkuznets@...hat.com, konrad.wilk@...cle.com, hch@....de,
        robin.murphy@....com, joro@...tes.org, parri.andrea@...il.com,
        dave.hansen@...el.com
Subject: Re: [PATCH V9 0/9] x86/Hyper-V: Add Hyper-V Isolation VM
 support(First part)

On Mon, Oct 25, 2021 at 08:21:05AM -0400, Tianyu Lan wrote:
> From: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> 
> Hyper-V provides two kinds of Isolation VMs. VBS(Virtualization-based
> security) and AMD SEV-SNP unenlightened Isolation VMs. This patchset
> is to add support for these Isolation VM support in Linux.
> 
> The memory of these vms are encrypted and host can't access guest
> memory directly. Hyper-V provides new host visibility hvcall and
> the guest needs to call new hvcall to mark memory visible to host
> before sharing memory with host. For security, all network/storage
> stack memory should not be shared with host and so there is bounce
> buffer requests.
> 
> Vmbus channel ring buffer already plays bounce buffer role because
> all data from/to host needs to copy from/to between the ring buffer
> and IO stack memory. So mark vmbus channel ring buffer visible.
> 
> For SNP isolation VM, guest needs to access the shared memory via
> extra address space which is specified by Hyper-V CPUID HYPERV_CPUID_
> ISOLATION_CONFIG. The access physical address of the shared memory
> should be bounce buffer memory GPA plus with shared_gpa_boundary
> reported by CPUID.
> 
> This patchset is rebased on the commit d9abdee of Linux mainline tree
> and plus clean up patch from Borislav Petkov(https://lore.kernel.org/r/
> YWRwxImd9Qcls/Yy@...tnic)
> 
> 

Applied to hyperv-next. Thanks.

Wei.