linux-kernel - RE: [Patch v3 13/14] PCI: hv: Add hypercalls to read/write MMIO space

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Message-ID: <PH7PR21MB31163EE3E83D6A0DDE83A13ECA069@PH7PR21MB3116.namprd21.prod.outlook.com>
Date:   Thu, 17 Nov 2022 18:33:20 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "hpa@...or.com" <hpa@...or.com>, KY Srinivasan <kys@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "lpieralisi@...nel.org" <lpieralisi@...nel.org>,
        "robh@...nel.org" <robh@...nel.org>, "kw@...ux.com" <kw@...ux.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.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>,
        "brijesh.singh@....com" <brijesh.singh@....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>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "isaku.yamahata@...el.com" <isaku.yamahata@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "jane.chu@...cle.com" <jane.chu@...cle.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>
Subject: RE: [Patch v3 13/14] PCI: hv: Add hypercalls to read/write MMIO space



> -----Original Message-----
> From: Michael Kelley (LINUX) <mikelley@...rosoft.com>
> Sent: Wednesday, November 16, 2022 1:42 PM
> To: hpa@...or.com; KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> <haiyangz@...rosoft.com>; wei.liu@...nel.org; Dexuan Cui
> <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
> <Tianyu.Lan@...rosoft.com>; kirill.shutemov@...ux.intel.com;
> sathyanarayanan.kuppuswamy@...ux.intel.com; ak@...ux.intel.com;
> isaku.yamahata@...el.com; Williams, Dan J <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
> Cc: Michael Kelley (LINUX) <mikelley@...rosoft.com>
> Subject: [Patch v3 13/14] PCI: hv: Add hypercalls to read/write MMIO space
> 
> To support PCI pass-thru devices in Confidential VMs, Hyper-V
> has added hypercalls to read and write MMIO space. Add the
> appropriate definitions to hyperv-tlfs.h and implement
> functions to make the hypercalls. These functions are used
> in a subsequent patch.
> 
> Co-developed-by: Dexuan Cui <decui@...rosoft.com>
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
> ---

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

One question - Will you put the document in patch 0 directly into some place of
the src tree?