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Re: [Xen-devel] [PATCH RFC for next] xen: make grant table configurable
- To: Wei Liu <wei.liu2@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 17 Jan 2019 20:19:28 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 17 Jan 2019 20:19:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 17/01/2019 12:30, Wei Liu wrote:
> Introduce CONFIG_GRANT_TABLE. Provide stubs and make sure x86 and arm
> hypervisors build with grant table disabled.
>
> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> ---
> I did this when I worked on splitting PV and HVM and thought this
> might be useful and it was simple enough to get done.
>
> RFC because I can envisage some configurations in the distant future
> do away with grant table and event channel. There is small a benefit
> to consider accepting this patch now so that Gitlab's randconf build
> can start testing with grant table turned off right away.
> ---
> xen/arch/arm/setup.c | 3 ++-
> xen/arch/arm/traps.c | 2 ++
> xen/arch/x86/hvm/Makefile | 2 +-
> xen/arch/x86/hvm/hypercall.c | 4 ++++
> xen/arch/x86/hypercall.c | 2 ++
> xen/arch/x86/pv/Makefile | 2 +-
> xen/arch/x86/pv/hypercall.c | 2 ++
> xen/arch/x86/setup.c | 6 +++--
> xen/common/Kconfig | 11 +++++++++
> xen/common/Makefile | 2 +-
> xen/include/asm-arm/grant_table.h | 4 +++-
> xen/include/xen/grant_table.h | 49
> +++++++++++++++++++++++++++++++++++++--
> 12 files changed, 80 insertions(+), 9 deletions(-)
>
> diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
> index 444857a967..3cd3513928 100644
> --- a/xen/arch/arm/setup.c
> +++ b/xen/arch/arm/setup.c
> @@ -740,7 +740,8 @@ void __init start_xen(unsigned long boot_phys_offset,
> .flags = XEN_DOMCTL_CDF_hvm_guest | XEN_DOMCTL_CDF_hap,
> .max_evtchn_port = -1,
> .max_grant_frames = gnttab_dom0_frames(),
> - .max_maptrack_frames = opt_max_maptrack_frames,
> + .max_maptrack_frames = IS_ENABLED(CONFIG_GRANT_TABLE) ?
> + opt_max_maptrack_frames : 0,
You can remove this conditional logic by adding #define
opt_max_grant_frames 0 in the stubs in grant_table.h
~Andrew
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