62 lines
2.4 KiB
Diff
62 lines
2.4 KiB
Diff
From 5719afc7a40868418405a87a2711088556e68a3b Mon Sep 17 00:00:00 2001
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From: Pingfan Liu <piliu@redhat.com>
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Date: Fri, 2 Jul 2021 10:14:21 +0800
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Subject: [PATCH 1/4] arm64: rename ARM64_PAGE_OFFSET_ACTUAL to
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ARM64_FLIP_PAGE_OFFSET_ACTUAL
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Reflect the flipped layout of kernel VA, which is introduced by
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kernel commit 14c127c957c1 ("arm64: mm: Flip kernel VA space").
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Signed-off-by: Pingfan Liu <piliu@redhat.com>
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---
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arm64.c | 10 ++++++----
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defs.h | 3 ++-
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2 files changed, 8 insertions(+), 5 deletions(-)
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diff --git a/arm64.c b/arm64.c
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index 8934961..9fe1a4a 100644
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--- a/arm64.c
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+++ b/arm64.c
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@@ -217,10 +217,12 @@ arm64_init(int when)
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arm64_calc_VA_BITS();
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arm64_calc_KERNELPACMASK();
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ms = machdep->machspec;
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+
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+ /* vabits_actual introduced after mm flip, so it should be flipped layout */
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if (ms->VA_BITS_ACTUAL) {
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- ms->page_offset = ARM64_PAGE_OFFSET_ACTUAL;
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- machdep->identity_map_base = ARM64_PAGE_OFFSET_ACTUAL;
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- machdep->kvbase = ARM64_PAGE_OFFSET_ACTUAL;
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+ ms->page_offset = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
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+ machdep->identity_map_base = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
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+ machdep->kvbase = ARM64_FLIP_PAGE_OFFSET_ACTUAL;
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ms->userspace_top = ARM64_USERSPACE_TOP_ACTUAL;
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} else {
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ms->page_offset = ARM64_PAGE_OFFSET;
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@@ -401,7 +403,7 @@ arm64_init(int when)
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fprintf(fp, "CONFIG_ARM64_VA_BITS: %ld\n", ms->CONFIG_ARM64_VA_BITS);
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fprintf(fp, " VA_BITS_ACTUAL: %ld\n", ms->VA_BITS_ACTUAL);
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fprintf(fp, "(calculated) VA_BITS: %ld\n", ms->VA_BITS);
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- fprintf(fp, " PAGE_OFFSET: %lx\n", ARM64_PAGE_OFFSET_ACTUAL);
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+ fprintf(fp, " PAGE_OFFSET: %lx\n", ARM64_FLIP_PAGE_OFFSET_ACTUAL);
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fprintf(fp, " VA_START: %lx\n", ms->VA_START);
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fprintf(fp, " modules: %lx - %lx\n", ms->modules_vaddr, ms->modules_end);
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fprintf(fp, " vmalloc: %lx - %lx\n", ms->vmalloc_start_addr, ms->vmalloc_end);
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diff --git a/defs.h b/defs.h
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index 5d32954..eb7ce6a 100644
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--- a/defs.h
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+++ b/defs.h
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@@ -3233,7 +3233,8 @@ typedef signed int s32;
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#define ARM64_PAGE_OFFSET ((0xffffffffffffffffUL) \
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<< (machdep->machspec->VA_BITS - 1))
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-#define ARM64_PAGE_OFFSET_ACTUAL ((0xffffffffffffffffUL) \
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+/* kernels >= v5.4 the kernel VA space is flipped */
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+#define ARM64_FLIP_PAGE_OFFSET_ACTUAL ((0xffffffffffffffffUL) \
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- ((1UL) << machdep->machspec->VA_BITS_ACTUAL) + 1)
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#define ARM64_USERSPACE_TOP ((1UL) << machdep->machspec->VA_BITS)
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--
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2.29.2
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