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-rw-r--r--arch/arm64/include/asm/kvm_pkvm.h71
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h
new file mode 100644
index 000000000..9f4ad2a8d
--- /dev/null
+++ b/arch/arm64/include/asm/kvm_pkvm.h
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 - Google LLC
+ * Author: Quentin Perret <qperret@google.com>
+ */
+#ifndef __ARM64_KVM_PKVM_H__
+#define __ARM64_KVM_PKVM_H__
+
+#include <linux/memblock.h>
+#include <asm/kvm_pgtable.h>
+
+#define HYP_MEMBLOCK_REGIONS 128
+
+extern struct memblock_region kvm_nvhe_sym(hyp_memory)[];
+extern unsigned int kvm_nvhe_sym(hyp_memblock_nr);
+
+static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
+{
+ unsigned long total = 0, i;
+
+ /* Provision the worst case scenario */
+ for (i = 0; i < KVM_PGTABLE_MAX_LEVELS; i++) {
+ nr_pages = DIV_ROUND_UP(nr_pages, PTRS_PER_PTE);
+ total += nr_pages;
+ }
+
+ return total;
+}
+
+static inline unsigned long __hyp_pgtable_total_pages(void)
+{
+ unsigned long res = 0, i;
+
+ /* Cover all of memory with page-granularity */
+ for (i = 0; i < kvm_nvhe_sym(hyp_memblock_nr); i++) {
+ struct memblock_region *reg = &kvm_nvhe_sym(hyp_memory)[i];
+ res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT);
+ }
+
+ return res;
+}
+
+static inline unsigned long hyp_s1_pgtable_pages(void)
+{
+ unsigned long res;
+
+ res = __hyp_pgtable_total_pages();
+
+ /* Allow 1 GiB for private mappings */
+ res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
+
+ return res;
+}
+
+static inline unsigned long host_s2_pgtable_pages(void)
+{
+ unsigned long res;
+
+ /*
+ * Include an extra 16 pages to safely upper-bound the worst case of
+ * concatenated pgds.
+ */
+ res = __hyp_pgtable_total_pages() + 16;
+
+ /* Allow 1 GiB for MMIO mappings */
+ res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
+
+ return res;
+}
+
+#endif /* __ARM64_KVM_PKVM_H__ */