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Re: [Xen-devel] [PATCH 00/34] Make CONFIG_HVM work
- To: Wei Liu <wei.liu2@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 20 Aug 2018 10:13:07 +0100
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- Delivery-date: Mon, 20 Aug 2018 09:13:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 17/08/2018 16:12, Wei Liu wrote:
> This series goes through x86 code to make CONFIG_HVM work.
>
> With this series, it is possible to build Xen with PV support only.
>
> Running `xl info` on a host with PV only Xen:
>
> root@lcy2-dt108:~# xl info
> host : lcy2-dt108
> release : 4.17.0-0.bpo.1-amd64
> version : #1 SMP Debian 4.17.8-1~bpo9+1 (2018-07-23)
> machine : x86_64
> nr_cpus : 8
> max_cpu_id : 7
> nr_nodes : 1
> cores_per_socket : 4
> threads_per_core : 2
> cpu_mhz : 3504.057
> hw_caps :
> bfebfbff:77faf3ff:2c100800:00000121:0000000f:009c6fbf:00000000:00000100
> virt_caps : hvm_directio
> total_memory : 32589
> free_memory : 4158
> sharing_freed_memory : 0
> sharing_used_memory : 0
> outstanding_claims : 0
> free_cpus : 0
> xen_major : 4
> xen_minor : 12
> xen_extra : -unstable
> xen_version : 4.12-unstable
> xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p
> xen_scheduler : credit
> xen_pagesize : 4096
> platform_params : virt_start=0xffff800000000000
> xen_changeset : Fri Aug 17 12:53:34 2018 +0100 git:382ad34e4e
> xen_commandline : placeholder loglvl=all guest_loglvl=all
> com2=115200,8n1 ucode=scan console=com2,vga console_to_ring
> sync_console hvm_fep
> cc_compiler : gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
> cc_compile_by : wei
> cc_compile_domain : uk.xensource.com
> cc_compile_date : Fri Aug 17 14:41:56 BST 2018
> build_id : 3989ecb7693aa02f6ecc748a951ed444cc70ba94
> xend_config_format : 4
>
> The hvm_directio flag is not accurate. See the last patch for
> discussion.
>
> The major goal at the moment is to get something that works first,
> then refine code structure later. Currently CONFIG_HVM is littered in
> individual files. In the future some of the code could / should be
> moved to files under hvm/ for cleaner split.
>
> I ran some basic PV / PVSHIM VM life cycle tests and XTF PV tests, all
> worked.
>
> $ ls -l xen # PV only, non-debug
> -rwxrwxr-x 1 wei wei 1957436 Aug 17 15:32 xen
> $ ls -l xen # default build, non-debug
> -rwxrwxr-x 1 wei wei 2379388 Aug 17 15:39 xen
>
> The PV only Xen is ~17.8% smaller in size.
Hmm - only that little? I'm somewhat surprised. I guess it will be
equally telling to see the delta for an HVM-only Xen.
Either way, to get this going in the right direction, Patches 1-4 are
trivial. Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
~Andrew
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