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hyperv: Do not overlap the hvcall IO areas in hv_vtl_apicid_to_vp_id()

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The Top-Level Functional Specification for Hyper-V, Section 3.6 [1, 2],
disallows overlapping of the input and output hypercall areas, and
hv_vtl_apicid_to_vp_id() overlaps them.

Use the output hypercall page of the current vCPU for the hypercall.

[1] https://learn.microsoft.com/en-us/virtualization/hyper-v-on-windows/tlfs/hypercall-interface
[2] https://github.com/MicrosoftDocs/Virtualization-Documentation/tree/main/tlfs

Reported-by: Michael Kelley <mhklinux@outlook.com>
Closes: https://lore.kernel.org/lkml/SN6PR02MB4157B98CD34781CC87A9D921D40D2@SN6PR02MB4157.namprd02.prod.outlook.com/
Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Easwar Hariharan <eahariha@linux.microsoft.com>
Reviewed-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250108222138.1623703-6-romank@linux.microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250108222138.1623703-6-romank@linux.microsoft.com>
This commit is contained in:
Roman Kisel 2025-01-08 14:21:38 -08:00 committed by Wei Liu
parent 07412e1f16
commit f285d99574
1 changed files with 1 additions and 1 deletions
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2
arch/x86/hyperv/hv_vtl.c
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@ -189,7 +189,7 @@ static int hv_vtl_apicid_to_vp_id(u32 apic_id)
input->partition_id = HV_PARTITION_ID_SELF;
input->apic_ids[0] = apic_id;
output = (u32 *)input;
output = *this_cpu_ptr(hyperv_pcpu_output_arg);
control = HV_HYPERCALL_REP_COMP_1 | HVCALL_GET_VP_ID_FROM_APIC_ID;
status = hv_do_hypercall(control, input, output);