linux-kernel - RE: [PATCH V7 5/5] net: netvsc: Add Isolation VM support for netvsc driver

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Date:   Mon, 13 Dec 2021 16:56:30 +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>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "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>,
        "arnd@...db.de" <arnd@...db.de>,
        "hch@...radead.org" <hch@...radead.org>,
        "m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "Michael Kelley (LINUX)" <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>,
        "brijesh.singh@....com" <brijesh.singh@....com>,
        "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
        "hch@....de" <hch@....de>, "joro@...tes.org" <joro@...tes.org>,
        "parri.andrea@...il.com" <parri.andrea@...il.com>,
        "dave.hansen@...el.com" <dave.hansen@...el.com>
Subject: RE: [PATCH V7 5/5] net: netvsc: Add Isolation VM support for netvsc
 driver



> -----Original Message-----
> From: Tianyu Lan <ltykernel@...il.com>
> Sent: Monday, December 13, 2021 2:14 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; dave.hansen@...ux.intel.com;
> x86@...nel.org; hpa@...or.com; davem@...emloft.net; kuba@...nel.org; jejb@...ux.ibm.com;
> martin.petersen@...cle.com; arnd@...db.de; hch@...radead.org; m.szyprowski@...sung.com;
> robin.murphy@....com; thomas.lendacky@....com; Tianyu Lan <Tianyu.Lan@...rosoft.com>;
> Michael Kelley (LINUX) <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>; brijesh.singh@....com;
> konrad.wilk@...cle.com; hch@....de; joro@...tes.org; parri.andrea@...il.com;
> dave.hansen@...el.com
> Subject: [PATCH V7 5/5] 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.
> 
> rx/tx ring buffer is allocated via vzalloc() and they need to be
> mapped into unencrypted address space(above vTOM) before sharing
> with host and accessing. Add hv_map/unmap_memory() to map/umap rx
> /tx ring buffer.
> 
> Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> ---
> Change since v3:
>        * Replace HV_HYP_PAGE_SIZE with PAGE_SIZE and virt_to_hvpfn()
>          with vmalloc_to_pfn() in the hv_map_memory()
> 
> Change since v2:
>        * Add hv_map/unmap_memory() to map/umap rx/tx ring buffer.
> ---
>  arch/x86/hyperv/ivm.c             |  28 ++++++
>  drivers/hv/hv_common.c            |  11 +++
>  drivers/net/hyperv/hyperv_net.h   |   5 ++
>  drivers/net/hyperv/netvsc.c       | 136 +++++++++++++++++++++++++++++-
>  drivers/net/hyperv/netvsc_drv.c   |   1 +
>  drivers/net/hyperv/rndis_filter.c |   2 +
>  include/asm-generic/mshyperv.h    |   2 +
>  include/linux/hyperv.h            |   5 ++
>  8 files changed, 187 insertions(+), 3 deletions(-)
> 

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