Re: [PATCH 00/34] Make CONFIG_HVM work

From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Wei Liu <wei.liu2@citrix.com>
Cc: xen-devel@lists.xenproject.org
Subject: Re: [PATCH 00/34] Make CONFIG_HVM work
Date: Fri, 17 Aug 2018 11:55:10 -0400	[thread overview]
Message-ID: <20180817155510.GE19183@char.us.oracle.com> (raw)
In-Reply-To: <cover.f5351150954129956fcf53a7781206b6295df78d.1534518694.git-series.wei.liu2@citrix.com>

On Fri, Aug 17, 2018 at 04:12:18PM +0100, 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:

'PV only'? You mean HVM only surely?

> 
> 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

PV or HVM?

> 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.

Well, this is the third time you said it, so maybe you did mean PV only.?

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