Re: [PATCH 05/12] x86/hyperv: Change vTOM handling to use standard coco mechanisms

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To: Michael Kelley <mikelley@xxxxxxxxxxxxx>, hpa@xxxxxxxxx, kys@xxxxxxxxxxxxx, haiyangz@xxxxxxxxxxxxx, sthemmin@xxxxxxxxxxxxx, wei.liu@xxxxxxxxxx, decui@xxxxxxxxxxxxx, luto@xxxxxxxxxx, peterz@xxxxxxxxxxxxx, davem@xxxxxxxxxxxxx, edumazet@xxxxxxxxxx, kuba@xxxxxxxxxx, pabeni@xxxxxxxxxx, lpieralisi@xxxxxxxxxx, robh@xxxxxxxxxx, kw@xxxxxxxxx, bhelgaas@xxxxxxxxxx, arnd@xxxxxxxx, hch@xxxxxxxxxxxxx, m.szyprowski@xxxxxxxxxxx, robin.murphy@xxxxxxx, thomas.lendacky@xxxxxxx, brijesh.singh@xxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, Tianyu.Lan@xxxxxxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx, ak@xxxxxxxxxxxxxxx, isaku.yamahata@xxxxxxxxx, dan.j.williams@xxxxxxxxx, jane.chu@xxxxxxxxxx, seanjc@xxxxxxxxxx, tony.luck@xxxxxxxxx, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxx
Subject: Re: [PATCH 05/12] x86/hyperv: Change vTOM handling to use standard coco mechanisms
From: Tianyu Lan <ltykernel@xxxxxxxxx>
Date: Thu, 3 Nov 2022 22:00:39 +0800
In-reply-to: <1666288635-72591-6-git-send-email-mikelley@microsoft.com>
References: <1666288635-72591-1-git-send-email-mikelley@microsoft.com> <1666288635-72591-6-git-send-email-mikelley@microsoft.com>
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.4.1

On 10/21/2022 1:57 AM, Michael Kelley wrote:

+
+void __init hv_vtom_init(void)
+{
+	cc_set_vendor(CC_VENDOR_HYPERV);
+	cc_set_mask(ms_hyperv.shared_gpa_boundary);
+	physical_mask &= ms_hyperv.shared_gpa_boundary - 1;



hv_vtom_init() also works for VBS case. VBS doesn't have vTOM support

and so shared_gpa_boundary should not be applied for VBS. Here seems toassume ms_hyperv.shared_gpa_boundary to 0 for VBS, right?

Follow-Ups:
- RE: [PATCH 05/12] x86/hyperv: Change vTOM handling to use standard coco mechanisms
  - From: Michael Kelley (LINUX)

References:
- [PATCH 00/12] Add PCI pass-thru support to Hyper-V Confidential VMs
  - From: Michael Kelley
- [PATCH 05/12] x86/hyperv: Change vTOM handling to use standard coco mechanisms
  - From: Michael Kelley

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