x86/hyperv: Fix output argument to hypercall that changes page visibility

[ Upstream commit 09beefefb57bbc3a06d98f319d85db4d719d7bcb ]

The hypercall in hv_mark_gpa_visibility() is invoked with an input
argument and an output argument. The output argument ostensibly returns
the number of pages that were processed. But in fact, the hypercall does
not provide any output, so the output argument is spurious.

The spurious argument is harmless because Hyper-V ignores it, but in the
interest of correctness and to avoid the potential for future problems,
remove it.

Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Link: https://lore.kernel.org/r/20250226200612.2062-2-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20250226200612.2062-2-mhklinux@outlook.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c
index 60fc3ed728304c547efc9d67c3c89bf5ebe0b628..aa8befc4d90138d8b48d2e7bac15e9db39fe1314 100644 (file)
--- a/arch/x86/hyperv/ivm.c
+++ b/arch/x86/hyperv/ivm.c
@@ -465,7 +465,6 @@ static int hv_mark_gpa_visibility(u16 count, const u64 pfn[],
                           enum hv_mem_host_visibility visibility)
 {
        struct hv_gpa_range_for_visibility *input;
-       u16 pages_processed;
        u64 hv_status;
        unsigned long flags;
 
@@ -494,7 +493,7 @@ static int hv_mark_gpa_visibility(u16 count, const u64 pfn[],
        memcpy((void *)input->gpa_page_list, pfn, count * sizeof(*pfn));
        hv_status = hv_do_rep_hypercall(
                        HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY, count,
-                       0, input, &pages_processed);
+                       0, input, NULL);
        local_irq_restore(flags);
 
        if (hv_result_success(hv_status))