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Date:   Tue, 19 Nov 2019 16:13:42 +0900
From:   AKASHI Takahiro <takahiro.akashi@linaro.org>
To:     Prabhakar Kushwaha <prabhakar.pkin@gmail.com>
Cc:     Bhupesh Sharma <bhsharma@redhat.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Bhupesh SHARMA <bhupesh.linux@gmail.com>,
        Boris Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jonathan Corbet <corbet@lwn.net>,
        James Morse <james.morse@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Will Deacon <will@kernel.org>,
        Steve Capper <steve.capper@arm.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Paul Mackerras <paulus@samba.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Dave Anderson <anderson@redhat.com>,
        Kazuhito Hagio <k-hagio@ab.jp.nec.com>, x86@kernel.org,
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Subject: Re: [PATCH v4 0/3] Append new variables to vmcoreinfo (TCR_EL1.T1SZ
 for arm64 and MAX_PHYSMEM_BITS for all archs)
Message-ID: <20191119071341.GW22427@linaro.org>
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        Prabhakar Kushwaha <prabhakar.pkin@gmail.com>,
        Bhupesh Sharma <bhsharma@redhat.com>,
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        Bhupesh SHARMA <bhupesh.linux@gmail.com>,
        Boris Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Jonathan Corbet <corbet@lwn.net>, James Morse <james.morse@arm.com>,
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        Steve Capper <steve.capper@arm.com>,
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Hi Prabhakar,

On Tue, Nov 19, 2019 at 12:02:46PM +0530, Prabhakar Kushwaha wrote:
> Hi Akashi,
> 
> On Fri, Nov 15, 2019 at 7:29 AM AKASHI Takahiro
> <takahiro.akashi@linaro.org> wrote:
> >
> > Bhupesh,
> >
> > On Fri, Nov 15, 2019 at 01:24:17AM +0530, Bhupesh Sharma wrote:
> > > Hi Akashi,
> > >
> > > On Wed, Nov 13, 2019 at 12:11 PM AKASHI Takahiro
> > > <takahiro.akashi@linaro.org> wrote:
> > > >
> > > > Hi Bhupesh,
> > > >
> > > > Do you have a corresponding patch for userspace tools,
> > > > including crash util and/or makedumpfile?
> > > > Otherwise, we can't verify that a generated core file is
> > > > correctly handled.
> > >
> > > Sure. I am still working on the crash-utility related changes, but you
> > > can find the makedumpfile changes I posted a couple of days ago here
> > > (see [0]) and the github link for the makedumpfile changes can be seen
> > > via [1].
> > >
> > > I will post the crash-util changes shortly as well.
> > > Thanks for having a look at the same.
> >
> > Thank you.
> > I have tested my kdump patch with a hacked version of crash
> > where VA_BITS_ACTUAL is calculated from tcr_el1_t1sz in vmcoreinfo.
> >
> 
> I also did hack to calculate VA_BITS_ACTUAL is calculated from
> tcr_el1_t1sz in vmcoreinfo. Now i am getting error same as mentioned
> by you in other thread last month.
> https://www.mail-archive.com/crash-utility@redhat.com/msg07385.html
> 
> how this error was overcome?
> 
> I am using
>  - crashkernel: https://github.com/crash-utility/crash.git  commit:
> babd7ae62d4e8fd6f93fd30b88040d9376522aa3
> and
>  - Linux: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> commit: af42d3466bdc8f39806b26f593604fdc54140bcb

# I am rather reluctant to cross-post non-kernel patch to lkml/lakml,

The only change I made to crash utility was:
===8<===
diff --git a/arm64.c b/arm64.c
index 5ee5f1a29a41..84e40aeb561b 100644
--- a/arm64.c
+++ b/arm64.c
@@ -3857,8 +3857,8 @@ arm64_calc_VA_BITS(void)
 		} else if (ACTIVE())
 			error(FATAL, "cannot determine VA_BITS_ACTUAL: please use /proc/kcore\n");
 		else {
-			if ((string = pc->read_vmcoreinfo("NUMBER(VA_BITS_ACTUAL)"))) {
-				value = atol(string);
+			if ((string = pc->read_vmcoreinfo("NUMBER(tcr_el1_t1sz)"))) {
+				value = 64 - strtoll(string, NULL, 0);
 				free(string);
 				machdep->machspec->VA_BITS_ACTUAL = value;
 				machdep->machspec->VA_BITS = value;
===>8===

Thanks,
-Takahiro Akashi

> --pk