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From: Kazuhito Hagio <k-hagio@ab.jp.nec.com>
To: Bhupesh Sharma <bhsharma@redhat.com>, Dave Young <dyoung@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	"lijiang@redhat.com" <lijiang@redhat.com>,
	"bhe@redhat.com" <bhe@redhat.com>,
	"ard.biesheuvel@linaro.org" <ard.biesheuvel@linaro.org>,
	"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
	"kexec@lists.infradead.org" <kexec@lists.infradead.org>,
	Will Deacon <will.deacon@arm.com>,
	AKASHI Takahiro <takahiro.akashi@linaro.org>,
	James Morse <james.morse@arm.com>, Borislav Petkov <bp@alien8.de>,
	"anderson@redhat.com" <anderson@redhat.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: RE: [PATCH] arm64, vmcoreinfo : Append 'MAX_USER_VA_BITS' and 'MAX_PHYSMEM_BITS' to vmcoreinfo
Date: Tue, 12 Feb 2019 23:03:13 +0000
Message-ID: <4AE2DC15AC0B8543882A74EA0D43DBEC035683DB@BPXM09GP.gisp.nec.co.jp> (raw)
In-Reply-To: <CACi5LpOAADU8s+3e6=fO7FT+VtAmWYNeZN9COF+4Gt6twLWYaA@mail.gmail.com>


On 2/12/2019 2:59 PM, Bhupesh Sharma wrote:
> BTW, in the makedumpfile enablement patch thread for ARMv8.2 LVA
> (which I sent out for 52-bit User space VA enablement) (see [0]), Kazu
> mentioned that the changes look necessary.
> 
> [0]. http://lists.infradead.org/pipermail/kexec/2019-February/022431.html

> > > The increased 'PTRS_PER_PGD' value for such cases needs to be then
> > > calculated as is done by the underlying kernel (see
> > > 'arch/arm64/include/asm/pgtable-hwdef.h' for details):
> > >
> > > #define PTRS_PER_PGD          (1 << (MAX_USER_VA_BITS - PGDIR_SHIFT))

Yes, this is the reason why makedumpfile needs the MAX_USER_VA_BITS.
It is used for pgd_index() also in makedumpfile to walk page tables.

/* to find an entry in a page-table-directory */
#define pgd_index(addr)         (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))

Thanks,
Kazu

> > >
> > > Also, note that 'arch/arm64/include/asm/memory.h' defines 'MAX_USER_VA_BITS'
> > > as 'VA_BITS' in case 'CONFIG_ARM64_USER_VA_BITS_52' is set to 'n':
> > >
> > > #ifdef CONFIG_ARM64_USER_VA_BITS_52
> > > #define MAX_USER_VA_BITS      52
> > > #else
> > > #define MAX_USER_VA_BITS      VA_BITS
> > > #endif
> > >
> > > So, makedumpfile will need this symbol exported in vmcore to make the above
> > > determination.
> > >
> > > [0]. http://lists.infradead.org/pipermail/kexec/2019-February/022425.html
> > >
> > > Thanks,
> > > Bhupesh
> >
> > Thanks
> > Dave

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Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-30 12:23 Bhupesh Sharma
2019-01-30 15:21 ` 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 [this message]
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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