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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/arch/x86/hyperv/nested.c
..
..
@@ -7,6 +7,7 @@
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  *
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  * Author : Lan Tianyu <Tianyu.Lan@microsoft.com>
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  */
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+#define pr_fmt(fmt)  "Hyper-V: " fmt
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 #include <linux/types.h>
..
..
@@ -54,3 +55,82 @@
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 	return ret;
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 }
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 EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping);
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+
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+int hyperv_fill_flush_guest_mapping_list(
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+		struct hv_guest_mapping_flush_list *flush,
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+		u64 start_gfn, u64 pages)
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+{
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+	u64 cur = start_gfn;
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+	u64 additional_pages;
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+	int gpa_n = 0;
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+
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+	do {
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+		/*
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+		 * If flush requests exceed max flush count, go back to
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+		 * flush tlbs without range.
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+		 */
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+		if (gpa_n >= HV_MAX_FLUSH_REP_COUNT)
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+			return -ENOSPC;
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+
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+		additional_pages = min_t(u64, pages, HV_MAX_FLUSH_PAGES) - 1;
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+
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+		flush->gpa_list[gpa_n].page.additional_pages = additional_pages;
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+		flush->gpa_list[gpa_n].page.largepage = false;
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+		flush->gpa_list[gpa_n].page.basepfn = cur;
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+
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+		pages -= additional_pages + 1;
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+		cur += additional_pages + 1;
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+		gpa_n++;
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+	} while (pages > 0);
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+
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+	return gpa_n;
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+}
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+EXPORT_SYMBOL_GPL(hyperv_fill_flush_guest_mapping_list);
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+
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+int hyperv_flush_guest_mapping_range(u64 as,
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+		hyperv_fill_flush_list_func fill_flush_list_func, void *data)
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+{
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+	struct hv_guest_mapping_flush_list **flush_pcpu;
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+	struct hv_guest_mapping_flush_list *flush;
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+	u64 status = 0;
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+	unsigned long flags;
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+	int ret = -ENOTSUPP;
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+	int gpa_n = 0;
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+
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+	if (!hv_hypercall_pg || !fill_flush_list_func)
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+		goto fault;
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+
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+	local_irq_save(flags);
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+
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+	flush_pcpu = (struct hv_guest_mapping_flush_list **)
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+		this_cpu_ptr(hyperv_pcpu_input_arg);
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+
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+	flush = *flush_pcpu;
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+	if (unlikely(!flush)) {
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+		local_irq_restore(flags);
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+		goto fault;
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+	}
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+
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+	flush->address_space = as;
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+	flush->flags = 0;
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+
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+	gpa_n = fill_flush_list_func(flush, data);
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+	if (gpa_n < 0) {
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+		local_irq_restore(flags);
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+		goto fault;
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+	}
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+
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+	status = hv_do_rep_hypercall(HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST,
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+				     gpa_n, 0, flush, NULL);
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+
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+	local_irq_restore(flags);
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+
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+	if (!(status & HV_HYPERCALL_RESULT_MASK))
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+		ret = 0;
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+	else
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+		ret = status;
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+fault:
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+	trace_hyperv_nested_flush_guest_mapping_range(as, ret);
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+	return ret;
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+}
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+EXPORT_SYMBOL_GPL(hyperv_flush_guest_mapping_range);