From 07412e1f163de6567f5f4a2c8a44ae96a2a05422 Mon Sep 17 00:00:00 2001 From: Roman Kisel Date: Wed, 8 Jan 2025 14:21:37 -0800 Subject: [PATCH] hyperv: Do not overlap the hvcall IO areas in get_vtl() The Top-Level Functional Specification for Hyper-V, Section 3.6 [1, 2], disallows overlapping of the input and output hypercall areas, and get_vtl(void) does overlap 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 Fixes: 8387ce06d70b ("x86/hyperv: Set Virtual Trust Level in VMBus init message") Signed-off-by: Roman Kisel Reviewed-by: Tianyu Lan Reviewed-by: Easwar Hariharan Link: https://lore.kernel.org/r/20250108222138.1623703-5-romank@linux.microsoft.com Signed-off-by: Wei Liu Message-ID: <20250108222138.1623703-5-romank@linux.microsoft.com> --- arch/x86/hyperv/hv_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index f82d1aefaa8a..173005e6a95d 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -422,7 +422,7 @@ static u8 __init get_vtl(void) local_irq_save(flags); input = *this_cpu_ptr(hyperv_pcpu_input_arg); - output = (struct hv_output_get_vp_registers *)input; + output = *this_cpu_ptr(hyperv_pcpu_output_arg); memset(input, 0, struct_size(input, names, 1)); input->partition_id = HV_PARTITION_ID_SELF;