From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Keir Fraser <keir@xen.org>, Tim Deegan <tim@xen.org>,
Ian Jackson <ian.jackson@eu.citrix.com>,
mpohlack@amazon.de, ross.lagerwall@citrix.com,
Julien Grall <julien.grall@arm.com>,
Jan Beulich <jbeulich@suse.com>,
sasha.levin@oracle.com, xen-devel@lists.xenproject.org
Subject: Re: [PATCH v7 06/24] arm/x86/vmap: Add vmalloc_xen, vfree_xen and vm_init_type
Date: Mon, 11 Apr 2016 09:29:30 -0400 [thread overview]
Message-ID: <20160411132930.GB14378@char.us.oracle.com> (raw)
In-Reply-To: <570B70EF.6080403@citrix.com>
On Mon, Apr 11, 2016 at 10:39:59AM +0100, Andrew Cooper wrote:
> On 10/04/16 22:14, Konrad Rzeszutek Wilk wrote:
> > For those users who want to use the virtual addresses that
> > are in the hypervisor's virtual address space - these threej new
>
> Technically, all space is "the hypervisor's". Perhaps "the hypervisor's
> code/data region" instead?
>
> Also, is this new threej something similar to three?
>
> > functions allow that. Along with providing the underlaying
> > MFNs for the user's (such as changing page table permissions).
>
> The MFNs are now not provided.
Duh. Yes indeed. Thank you!
>
> >
> > Implementation wise the vmap API keeps track of two virtual
> > address regions now:
> > a) VMAP_VIRT_START
> > b) Any provided virtual address space (need start and end).
> >
> > The a) one is the default one and the existing behavior
> > for users of vmalloc, vmap, etc is the same.
> >
> > If however one wishes to use the b) one only has to use
> > the vm_init_type to initialize and the vmalloc_type to utilize it.
> >
> > This allows users (such as xSplice) to provide their own
> > mechanism to change the the page flags, and also use virtual
> > addresses closer to the hypervisor virtual addresses (at least
> > on x86) while not having to deal with the allocation of
> > pages.
> >
> > For example of users, see patch titled "xsplice: Implement payload
> > loading", where we parse the payload's ELF relocations - which
> > is defined to be signed 32-bit (so max displacement is 2GB virtual
> > spacE). The displacement of the hypervisor virtual addresses to the
> > vmalloc (on x86) is more than 32-bits - which means that ELF relocations
> > would truncate the 34 and 33th bit. Hence this alternate API.
> >
> > We also add add extra checks in case the b) range has not been initialized.
> >
> > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> > Suggested-by: Jan Beulich <jbeulich@suse.com>
> > Acked-by: Julien Grall <julien.grall@arm.com> [ARM]
>
> Otherwise, much nicer than before.
>
> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
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next prev parent reply other threads:[~2016-04-11 13:30 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-10 21:14 [PATCH v7] xSplice v1 design and implementation Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 01/24] xsplice: Design document Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 02/24] xen/xsplice: Hypervisor implementation of XEN_XSPLICE_op Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 03/24] libxc: Implementation of XEN_XSPLICE_op in libxc Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 04/24] xen-xsplice: Tool to manipulate xsplice payloads Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 05/24] arm/x86: Use struct virtual_region to do bug, symbol, and (x86) exception tables lookup Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 06/24] arm/x86/vmap: Add vmalloc_xen, vfree_xen and vm_init_type Konrad Rzeszutek Wilk
2016-04-11 9:39 ` Andrew Cooper
2016-04-11 13:29 ` Konrad Rzeszutek Wilk [this message]
2016-04-10 21:14 ` [PATCH v7 07/24] x86/mm: Introduce modify_xen_mappings() Konrad Rzeszutek Wilk
2016-04-11 12:51 ` George Dunlap
2016-04-11 13:00 ` Andrew Cooper
2016-04-11 14:04 ` [PATCH v7.1 " Andrew Cooper
2016-04-11 15:21 ` George Dunlap
2016-04-11 17:18 ` Jan Beulich
2016-04-11 17:33 ` Andrew Cooper
2016-04-11 17:46 ` [PATCH v7.2 " Andrew Cooper
2016-04-11 17:54 ` Jan Beulich
2016-04-12 9:08 ` Andrew Cooper
2016-04-10 21:14 ` [PATCH v7 08/24] xsplice: Add helper elf routines Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 09/24] xsplice: Implement payload loading Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 10/24] xsplice: Implement support for applying/reverting/replacing patches Konrad Rzeszutek Wilk
2016-04-11 10:14 ` Andrew Cooper
2016-04-11 13:29 ` Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 11/24] x86/xen_hello_world.xsplice: Test payload for patching 'xen_extra_version' Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 12/24] xsplice, symbols: Implement symbol name resolution on address Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 13/24] x86, xsplice: Print payload's symbol name and payload name in backtraces Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 14/24] xsplice: Add support for bug frames Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 15/24] xsplice: Add support for exception tables Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 16/24] xsplice: Add support for alternatives Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 17/24] build_id: Provide ld-embedded build-ids Konrad Rzeszutek Wilk
2016-04-11 12:17 ` Andrew Cooper
2016-04-11 13:31 ` Konrad Rzeszutek Wilk
2016-04-11 13:35 ` Andrew Cooper
2016-04-10 21:14 ` [PATCH v7 18/24] HYPERCALL_version_op: Add VERSION_build_id to retrieve build-id Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 19/24] libxl: info: Display build_id of the hypervisor using XEN_VERSION_build_id Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 20/24] xsplice: Print build_id in keyhandler and on bootup Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 21/24] xsplice: Stacking build-id dependency checking Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 22/24] xsplice/xen_replace_world: Test-case for XSPLICE_ACTION_REPLACE Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 23/24] xsplice: Prevent duplicate payloads from being loaded Konrad Rzeszutek Wilk
2016-04-10 21:14 ` [PATCH v7 24/24] MAINTAINERS/xsplice: Add myself and Ross as the maintainers Konrad Rzeszutek Wilk
2016-04-11 14:32 ` [PATCH v7] xSplice v1 design and implementation Konrad Rzeszutek Wilk
2016-04-11 15:43 ` Konrad Rzeszutek Wilk
2016-04-12 8:10 ` Ross Lagerwall
2016-04-12 20:59 ` Konrad Rzeszutek Wilk
2016-04-12 20:59 ` [PATCH v7 25/24] symbols/xsplice: Implement fast symbol names -> virtual addresses lookup Konrad Rzeszutek Wilk
2016-04-13 2:03 ` Konrad Rzeszutek Wilk
2016-04-13 2:17 ` Konrad Rzeszutek Wilk
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