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Date:   Tue, 14 Sep 2021 15:49:29 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     Tianyu Lan <ltykernel@...il.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "x86@...nel.org" <x86@...nel.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
        "boris.ostrovsky@...cle.com" <boris.ostrovsky@...cle.com>,
        "jgross@...e.com" <jgross@...e.com>,
        "sstabellini@...nel.org" <sstabellini@...nel.org>,
        "joro@...tes.org" <joro@...tes.org>,
        "will@...nel.org" <will@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "arnd@...db.de" <arnd@...db.de>, "hch@....de" <hch@....de>,
        "m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "brijesh.singh@....com" <brijesh.singh@....com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "pgonda@...gle.com" <pgonda@...gle.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "rppt@...nel.org" <rppt@...nel.org>,
        "sfr@...b.auug.org.au" <sfr@...b.auug.org.au>,
        "aneesh.kumar@...ux.ibm.com" <aneesh.kumar@...ux.ibm.com>,
        "saravanand@...com" <saravanand@...com>,
        "krish.sadhukhan@...cle.com" <krish.sadhukhan@...cle.com>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "tj@...nel.org" <tj@...nel.org>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        Michael Kelley <mikelley@...rosoft.com>
CC:     "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        vkuznets <vkuznets@...hat.com>,
        "parri.andrea@...il.com" <parri.andrea@...il.com>,
        "dave.hansen@...el.com" <dave.hansen@...el.com>
Subject: RE: [PATCH V5 12/12] net: netvsc: Add Isolation VM support for netvsc
 driver



> -----Original Message-----
> From: Tianyu Lan <ltykernel@...il.com>
> Sent: Tuesday, September 14, 2021 9:39 AM
> To: KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> <haiyangz@...rosoft.com>; Stephen Hemminger <sthemmin@...rosoft.com>;
> wei.liu@...nel.org; Dexuan Cui <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;
> konrad.wilk@...cle.com; boris.ostrovsky@...cle.com; jgross@...e.com;
> sstabellini@...nel.org; joro@...tes.org; will@...nel.org;
> davem@...emloft.net; kuba@...nel.org; jejb@...ux.ibm.com;
> martin.petersen@...cle.com; gregkh@...uxfoundation.org; arnd@...db.de;
> hch@....de; m.szyprowski@...sung.com; robin.murphy@....com;
> brijesh.singh@....com; Tianyu Lan <Tianyu.Lan@...rosoft.com>;
> thomas.lendacky@....com; pgonda@...gle.com; akpm@...ux-foundation.org;
> kirill.shutemov@...ux.intel.com; rppt@...nel.org; sfr@...b.auug.org.au;
> aneesh.kumar@...ux.ibm.com; saravanand@...com;
> krish.sadhukhan@...cle.com; xen-devel@...ts.xenproject.org;
> tj@...nel.org; rientjes@...gle.com; Michael Kelley
> <mikelley@...rosoft.com>
> Cc: iommu@...ts.linux-foundation.org; linux-arch@...r.kernel.org; linux-
> hyperv@...r.kernel.org; linux-kernel@...r.kernel.org; linux-
> scsi@...r.kernel.org; netdev@...r.kernel.org; vkuznets
> <vkuznets@...hat.com>; parri.andrea@...il.com; dave.hansen@...el.com
> Subject: [PATCH V5 12/12] net: netvsc: Add Isolation VM support for
> netvsc driver
> 
> From: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> 
> In Isolation VM, all shared memory with host needs to mark visible
> to host via hvcall. vmbus_establish_gpadl() has already done it for
> netvsc rx/tx ring buffer. The page buffer used by vmbus_sendpacket_
> pagebuffer() stills need to be handled. Use DMA API to map/umap
> these memory during sending/receiving packet and Hyper-V swiotlb
> bounce buffer dma address will be returned. The swiotlb bounce buffer
> has been masked to be visible to host during boot up.
> 
> Allocate rx/tx ring buffer via alloc_pages() in Isolation VM and map
> these pages via vmap(). After calling vmbus_establish_gpadl() which
> marks these pages visible to host, unmap these pages to release the
> virtual address mapped with physical address below shared_gpa_boundary
> and map them in the extra address space via vmap_pfn().
> 
> Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> ---
> Change since v4:
> 	* Allocate rx/tx ring buffer via alloc_pages() in Isolation VM
> 	* Map pages after calling vmbus_establish_gpadl().
> 	* set dma_set_min_align_mask for netvsc driver.
> 
> Change since v3:
> 	* Add comment to explain why not to use dma_map_sg()
> 	* Fix some error handle.
> ---

Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>

Thank you!

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