67 lines
2.6 KiB
Diff
67 lines
2.6 KiB
Diff
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From c180a63f2cb370da6097ad97eb07333c07aa988b Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Mon, 25 Oct 2021 16:53:26 +0900
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Subject: [PATCH 8/9] arm64: Use VA_BITS for page_offset calculation
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Commit 167d37e347fe ("arm64: assign page_offset with VA_BITS kernel
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configuration value") changed the page_offset calculation from
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using VA_BITS_ACTUAL to CONFIG_ARM64_VA_BITS. This caused an error
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for ramdumps without vmcoreinfo like this:
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crash: vmlinux and /var/tmp/ramdump_elf_XUtCMT do not match!
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Set the vmcoreinfo value to VA_BITS if available, and use VA_BITS
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for page_offset calculation instead.
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Also remove ARM64_FLIP_PAGE_OFFSET_ACTUAL because it's not used
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actually.
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Reported-by: Ankur Bansal <er.ankurbansal@gmail.com>
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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arm64.c | 5 ++++-
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defs.h | 4 +---
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2 files changed, 5 insertions(+), 4 deletions(-)
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diff --git a/arm64.c b/arm64.c
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index 7069312671cf..3dcbcc642fda 100644
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--- a/arm64.c
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+++ b/arm64.c
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@@ -404,7 +404,7 @@ 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_FLIP_PAGE_OFFSET_ACTUAL);
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+ fprintf(fp, " PAGE_OFFSET: %lx\n", ARM64_FLIP_PAGE_OFFSET);
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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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@@ -4031,6 +4031,9 @@ 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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+ if (machdep->machspec->CONFIG_ARM64_VA_BITS)
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+ machdep->machspec->VA_BITS = machdep->machspec->CONFIG_ARM64_VA_BITS;
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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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diff --git a/defs.h b/defs.h
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index 8b356d5e8959..971005596506 100644
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--- a/defs.h
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+++ b/defs.h
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@@ -3238,9 +3238,7 @@ 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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/* kernels >= v5.4 the kernel VA space is flipped */
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-#define ARM64_FLIP_PAGE_OFFSET (-(1UL) << machdep->machspec->CONFIG_ARM64_VA_BITS)
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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_FLIP_PAGE_OFFSET (-(1UL) << machdep->machspec->VA_BITS)
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#define ARM64_USERSPACE_TOP ((1UL) << machdep->machspec->VA_BITS)
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#define ARM64_USERSPACE_TOP_ACTUAL ((1UL) << machdep->machspec->VA_BITS_ACTUAL)
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--
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2.30.2
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