85 lines
2.8 KiB
Diff
85 lines
2.8 KiB
Diff
From bf1379a8b6ff8d6a8fa12978f7194f15f85c4380 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 10:14:23 +0800
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Subject: [PATCH 15/16] arm64: use dedicated bits to record the VA space layout
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changes
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arm64 memory layout experiences big changes due to the following kernel
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commits in date descending order:
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5. 7bc1a0f9e176 arm64: mm: use single quantity to represent the PA to VA translation
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4. b6d00d47e81a arm64: mm: Introduce 52-bit Kernel VAs
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3. 5383cc6efed1 arm64: mm: Introduce vabits_actual
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2. 14c127c957c1 arm64: mm: Flip kernel VA space
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1. f80fb3a3d508 arm64: add support for kernel ASLR
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For 1, crash has already used NEW_VMEMMAP to trace it.
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For 2, crash lacks a flag to tag it and handle it differently.
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For 3, two important kernel variables vabits_actual and physvirt_offset
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are introduced.
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For 4, since it comes immediately after 3, crash-utility does not need
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to distinguish it.
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For 5, kernel variable phyvirt_offset is removed
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These changes have effects on PTOV()/VTOP() formula. So introducing
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two bits HAS_PHYSVIRT_OFFSET and FLIPPED_VM as hint to apply different
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formula.
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Signed-off-by: Pingfan Liu <piliu@redhat.com>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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arm64.c | 10 ++++++++++
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defs.h | 2 ++
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2 files changed, 12 insertions(+)
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diff --git a/arm64.c b/arm64.c
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index 149db36cd119..b04369f6d4d8 100644
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--- a/arm64.c
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+++ b/arm64.c
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@@ -563,6 +563,10 @@ arm64_dump_machdep_table(ulong arg)
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fprintf(fp, "%sMACHDEP_BT_TEXT", others++ ? "|" : "");
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if (machdep->flags & NEW_VMEMMAP)
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fprintf(fp, "%sNEW_VMEMMAP", others++ ? "|" : "");
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+ if (machdep->flags & FLIPPED_VM)
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+ fprintf(fp, "%sFLIPPED_VM", others++ ? "|" : "");
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+ if (machdep->flags & HAS_PHYSVIRT_OFFSET)
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+ fprintf(fp, "%sHAS_PHYSVIRT_OFFSET", others++ ? "|" : "");
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fprintf(fp, ")\n");
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fprintf(fp, " kvbase: %lx\n", machdep->kvbase);
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@@ -997,6 +1001,7 @@ arm64_calc_physvirt_offset(void)
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if (READMEM(pc->mfd, &physvirt_offset, sizeof(physvirt_offset),
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sp->value, sp->value -
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machdep->machspec->kimage_voffset) > 0) {
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+ machdep->flags |= HAS_PHYSVIRT_OFFSET;
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ms->physvirt_offset = physvirt_offset;
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}
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}
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@@ -3963,6 +3968,11 @@ arm64_calc_VA_BITS(void)
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error(FATAL, "cannot determine VA_BITS_ACTUAL\n");
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}
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+ /*
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+ * The mm flip commit is introduced before 52-bits VA, which is before the
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+ * commit to export NUMBER(TCR_EL1_T1SZ)
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+ */
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+ machdep->flags |= FLIPPED_VM;
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return;
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}
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diff --git a/defs.h b/defs.h
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index b7b20af4bcf9..eca145cb881c 100644
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--- a/defs.h
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+++ b/defs.h
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@@ -3214,6 +3214,8 @@ typedef signed int s32;
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#define NEW_VMEMMAP (0x80)
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#define VM_L4_4K (0x100)
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#define UNW_4_14 (0x200)
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+#define FLIPPED_VM (0x400)
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+#define HAS_PHYSVIRT_OFFSET (0x800)
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/*
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* Get kimage_voffset from /dev/crash
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--
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2.30.2
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