linux-arm-kernel.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
From: gleb@redhat.com (Gleb Natapov)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 02/14] ARM: Section based HYP idmap
Date: Mon, 14 Jan 2013 13:07:56 +0200	[thread overview]
Message-ID: <20130114110756.GA10209@redhat.com> (raw)
In-Reply-To: <20130114104952.GA4939@mudshark.cambridge.arm.com>

On Mon, Jan 14, 2013 at 10:49:53AM +0000, Will Deacon wrote:
> On Mon, Jan 14, 2013 at 10:27:21AM +0000, Gleb Natapov wrote:
> > On Tue, Jan 08, 2013 at 01:38:48PM -0500, Christoffer Dall wrote:
> > > Add a method (hyp_idmap_setup) to populate a hyp pgd with an
> > > identity mapping of the code contained in the .hyp.idmap.text
> > > section.
> > > 
> > > Offer a method to drop this identity mapping through
> > > hyp_idmap_teardown.
> > > 
> > > Make all the above depend on CONFIG_ARM_VIRT_EXT and CONFIG_ARM_LPAE.
> > > 
> > > Cc: Will Deacon <will.deacon@arm.com>
> > > Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
> > > Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> > > Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
> > > ---
> > >  arch/arm/include/asm/idmap.h                |    1 +
> > >  arch/arm/include/asm/pgtable-3level-hwdef.h |    1 +
> > >  arch/arm/kernel/vmlinux.lds.S               |    6 +++
> > >  arch/arm/mm/idmap.c                         |   54 ++++++++++++++++++++++-----
> > >  4 files changed, 50 insertions(+), 12 deletions(-)
> 
> [...]
> 
> > > -static void identity_mapping_add(pgd_t *pgd, unsigned long addr, unsigned long end)
> > > +static void identity_mapping_add(pgd_t *pgd, const char *text_start,
> > > +				 const char *text_end, unsigned long prot)
> > >  {
> > > -	unsigned long prot, next;
> > > +	unsigned long addr, end;
> > > +	unsigned long next;
> > > +
> > > +	addr = virt_to_phys(text_start);
> > > +	end = virt_to_phys(text_end);
> > How does this work with phys addresses greater than 32bit (with
> > LPAE)? This was the same before the patch too, but I am still
> > curious. Since __virt_to_phys() returns unsigned long kernel cannot be
> > put in high memory, right?
> 
> Well, AArch32 (arch/arm/) only supports 32-bit virtual addresses by virtue
> of the fact that our registers are only 32 bits wide, so we can't
> identity-map physical addresses above the 4GB boundary.
> 
Ah, of course. This is ident map so by definition it cannot map phys
addresses above 4G. And since __virt_to_phys() suppose to work only on
ident map it's OK to returns unsigned long.


> You may want to look at the keystone patches from TI for insight about
> kernels at high (>32-bit) addresses, although I've not seen any activity
> around that for some time now (which is a pity, because the code-patching
> stuff was in a good shape).
> 
> Will

--
			Gleb.

  reply	other threads:[~2013-01-14 11:07 UTC|newest]

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-01-08 18:38 [PATCH v5 00/14] KVM/ARM Implementation Christoffer Dall
2013-01-08 18:38 ` [PATCH v5 01/14] ARM: Add page table and page defines needed by KVM Christoffer Dall
2013-01-08 18:38 ` [PATCH v5 02/14] ARM: Section based HYP idmap Christoffer Dall
2013-01-14 10:27   ` Gleb Natapov
2013-01-14 10:49     ` Will Deacon
2013-01-14 11:07       ` Gleb Natapov [this message]
2013-01-14 13:07         ` Russell King - ARM Linux
2013-01-14 16:13   ` Russell King - ARM Linux
2013-01-14 17:09     ` Christoffer Dall
2013-01-08 18:38 ` [PATCH v5 03/14] KVM: ARM: Initial skeleton to compile KVM support Christoffer Dall
2013-01-14 15:09   ` Will Deacon
2013-01-14 15:40     ` Christoffer Dall
2013-01-14 16:24   ` Russell King - ARM Linux
2013-01-14 17:33     ` Christoffer Dall
2013-01-16  2:56       ` Rusty Russell
2013-01-16  9:44         ` Russell King - ARM Linux
2013-01-17  2:11           ` Rusty Russell
2013-01-14 18:49   ` Gleb Natapov
2013-01-14 22:17     ` Christoffer Dall
2013-01-15 13:32       ` Gleb Natapov
2013-01-15 13:43         ` [kvmarm] " Alexander Graf
2013-01-15 15:35           ` Gleb Natapov
2013-01-15 16:21             ` Alexander Graf
2013-01-08 18:39 ` [PATCH v5 04/14] KVM: ARM: Hypervisor initialization Christoffer Dall
2013-01-14 15:11   ` Will Deacon
2013-01-14 16:35     ` Christoffer Dall
2013-01-08 18:39 ` [PATCH v5 05/14] KVM: ARM: Memory virtualization setup Christoffer Dall
2013-01-08 18:39 ` [PATCH v5 06/14] KVM: ARM: Inject IRQs and FIQs from userspace Christoffer Dall
2013-01-15  9:56   ` Gleb Natapov
2013-01-15 12:15     ` [kvmarm] " Peter Maydell
2013-01-15 12:52       ` Gleb Natapov
2013-01-15 14:04         ` Peter Maydell
2013-01-15 14:40           ` Christoffer Dall
2013-01-15 15:17           ` Gleb Natapov
2013-01-15 16:25             ` Alexander Graf
2013-01-16 10:40               ` Gleb Natapov
2013-01-08 18:39 ` [PATCH v5 07/14] KVM: ARM: World-switch implementation Christoffer Dall
2013-01-15  9:43   ` Gleb Natapov
2013-01-16  2:08     ` Christoffer Dall
2013-01-16  4:08       ` Christoffer Dall
2013-01-16 12:57         ` Gleb Natapov
2013-01-16 15:40           ` Christoffer Dall
2013-01-16 16:17             ` Gleb Natapov
2013-01-16 12:12       ` Gleb Natapov
2013-01-16 13:14         ` Russell King - ARM Linux
2013-01-16 15:42         ` Christoffer Dall
2013-01-16 15:52           ` Gleb Natapov
2013-01-16 16:17             ` Christoffer Dall
2013-01-16 16:21               ` Gleb Natapov
2013-01-08 18:39 ` [PATCH v5 08/14] KVM: ARM: Emulation framework and CP15 emulation Christoffer Dall
2013-01-14 16:36   ` Russell King - ARM Linux
2013-01-14 17:38     ` Christoffer Dall
2013-01-14 18:33       ` Russell King - ARM Linux
2013-01-08 18:39 ` [PATCH v5 09/14] KVM: ARM: User space API for getting/setting co-proc registers Christoffer Dall
2013-01-08 18:39 ` [PATCH v5 10/14] KVM: ARM: Demux CCSIDR in the userspace API Christoffer Dall
2013-01-08 18:39 ` [PATCH v5 11/14] KVM: ARM: VFP userspace interface Christoffer Dall
2013-01-08 18:39 ` [PATCH v5 12/14] KVM: ARM: Handle guest faults in KVM Christoffer Dall
2013-01-08 18:40 ` [PATCH v5 13/14] KVM: ARM: Handle I/O aborts Christoffer Dall
2013-01-14 16:43   ` Russell King - ARM Linux
2013-01-14 18:25     ` Christoffer Dall
2013-01-14 18:43       ` Russell King - ARM Linux
2013-01-14 18:50         ` Will Deacon
2013-01-14 18:53           ` [kvmarm] " Alexander Graf
2013-01-14 18:56             ` Christoffer Dall
2013-01-14 19:00             ` Will Deacon
2013-01-14 19:12               ` Christoffer Dall
2013-01-14 22:36                 ` Will Deacon
2013-01-14 22:51                   ` Christoffer Dall
2013-01-15  7:00                   ` Gleb Natapov
2013-01-15 13:18   ` Gleb Natapov
2013-01-15 13:29     ` Marc Zyngier
2013-01-15 13:34       ` Gleb Natapov
2013-01-15 13:46         ` Marc Zyngier
2013-01-15 14:27           ` Gleb Natapov
2013-01-15 14:42             ` Christoffer Dall
2013-01-15 14:48             ` Marc Zyngier
2013-01-15 15:31               ` Gleb Natapov
2013-01-08 18:40 ` [PATCH v5 14/14] KVM: ARM: Add maintainer entry for KVM/ARM Christoffer Dall
2013-01-14 16:00 ` [PATCH v5 00/14] KVM/ARM Implementation Will Deacon
2013-01-14 22:31   ` Christoffer Dall

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20130114110756.GA10209@redhat.com \
    --to=gleb@redhat.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).