Messages in this thread | | | From | "Michael Kelley (LINUX)" <> | Subject | RE: [PATCH 05/12] x86/hyperv: Change vTOM handling to use standard coco mechanisms | Date | Thu, 3 Nov 2022 14:12:22 +0000 |
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From: Tianyu Lan <ltykernel@gmail.com> Sent: Thursday, November 3, 2022 7:01 AM > > 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 to > assume ms_hyperv.shared_gpa_boundary to 0 for VBS, right?
Yes, that is correct. In fact, you'll notice that this patch slightly changes the code in ms_hyperv_init_platform() so that shared_gpa_boundary is set only when it is known to be valid; otherwise it is left as zero. This change is specifically so that shared_gpa_boundary is zero for the VBS case.
Michael
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