From: Bhupesh Sharma <bhsharma@redhat.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Mark Rutland <mark.rutland@arm.com>,
ard.biesheuvel@linaro.org, catalin.marinas@arm.com,
bhsharma@redhat.com, kexec@lists.infradead.org,
Will Deacon <will.deacon@arm.com>,
AKASHI Takahiro <takahiro.akashi@linaro.org>,
James Morse <james.morse@arm.com>,
bhupesh.linux@gmail.com
Subject: [PATCH] arm64, vmcoreinfo : Append 'MAX_USER_VA_BITS' and 'MAX_PHYSMEM_BITS' to vmcoreinfo
Date: Wed, 30 Jan 2019 17:53:11 +0530 [thread overview]
Message-ID: <1548850991-11879-1-git-send-email-bhsharma@redhat.com> (raw)
With ARMv8.2-LVA and LPA architecture extensions, arm64 hardware which
supports these extensions can support upto 52-bit virtual and 52-bit
physical addresses respectively.
Since at the moment we enable the support of these extensions via CONFIG
flags, e.g.
- LPA via CONFIG_ARM64_PA_BITS_52
there are no clear mechanisms in user-space right now to
deteremine these CONFIG flag values and also determine the PARange and
VARange address values.
User-space tools like 'makedumpfile' and 'crash-utility' can instead
use the 'MAX_USER_VA_BITS' and 'MAX_PHYSMEM_BITS' values to determine
the maximum virtual address and physical address (respectively)
supported by underlying kernel.
A reference 'makedumpfile' implementation which uses this approach to
determining the maximum physical address is available in [0].
[0]. https://github.com/bhupesh-sharma/makedumpfile/blob/52-bit-pa-support-via-vmcore-v1/arch/arm64.c#L490
Cc: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: James Morse <james.morse@arm.com>
Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
---
arch/arm64/kernel/crash_core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/kernel/crash_core.c b/arch/arm64/kernel/crash_core.c
index ca4c3e12d8c5..ad231be5c0d8 100644
--- a/arch/arm64/kernel/crash_core.c
+++ b/arch/arm64/kernel/crash_core.c
@@ -10,6 +10,8 @@
void arch_crash_save_vmcoreinfo(void)
{
VMCOREINFO_NUMBER(VA_BITS);
+ VMCOREINFO_NUMBER(MAX_USER_VA_BITS);
+ VMCOREINFO_NUMBER(MAX_PHYSMEM_BITS);
/* Please note VMCOREINFO_NUMBER() uses "%d", not "%x" */
vmcoreinfo_append_str("NUMBER(kimage_voffset)=0x%llx\n",
kimage_voffset);
--
2.7.4
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next reply other threads:[~2019-01-30 12:23 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-30 12:23 Bhupesh Sharma [this message]
2019-01-30 15:21 ` [PATCH] arm64, vmcoreinfo : Append 'MAX_USER_VA_BITS' and 'MAX_PHYSMEM_BITS' to vmcoreinfo James Morse
2019-01-30 21:39 ` Bhupesh Sharma
2019-02-04 14:35 ` Bhupesh Sharma
2019-02-04 15:31 ` Robin Murphy
2019-02-12 4:55 ` Bhupesh Sharma
2019-02-12 10:49 ` Robin Murphy
2019-02-04 16:56 ` James Morse
2019-01-31 1:48 ` Dave Young
2019-01-31 10:00 ` Bhupesh Sharma
2019-01-31 14:03 ` Dave Anderson
2019-02-04 16:04 ` Kazuhito Hagio
2019-02-12 5:07 ` Bhupesh Sharma
2019-02-12 10:44 ` Dave Young
2019-02-12 19:59 ` Bhupesh Sharma
2019-02-12 23:03 ` Kazuhito Hagio
2019-02-13 11:15 ` Dave Young
2019-02-13 18:22 ` James Morse
2019-02-13 19:52 ` Kazuhito Hagio
2019-02-15 17:34 ` James Morse
2019-02-15 18:01 ` Bhupesh Sharma
2019-02-18 15:27 ` Steve Capper
2019-02-21 16:08 ` Bhupesh Sharma
2019-02-19 20:47 ` Kazuhito Hagio
2019-02-21 16:20 ` Bhupesh Sharma
2019-02-21 16:42 ` Dave Anderson
2019-02-21 19:02 ` Kazuhito Hagio
2019-03-01 4:01 ` Bhupesh Sharma
2019-02-14 19:30 ` Bhupesh Sharma
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