Re: [Xen-devel] [PATCH RFC] x86/shim: Refresh pvshim_defconfig

[Juergen Gross <jgross@xxxxxxxx>]

On 26.07.19 12:10, Andrew Cooper wrote:
> * Add a dependency so the shim gets rebuilt when pvshim_defconfig changes.
> * Default to the NULL scheduler now that it works with vcpu online/offline.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Wei Liu <wl@xxxxxxx>
> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> CC: Juergen Gross <jgross@xxxxxxxx>
> CC: Dario Faggioli <dfaggioli@xxxxxxxx>
>
> This patch depends on Dario's series, and cant go in until then.
>
> Also RFC.
>
> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> CC: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
>
> I tried turning off MEM_ACCESS, but I can't get Kconfig to actually turn it
> off in the build.  What is the deal with MEM_ACCESS_ALWAYS_ON ?  It makes it
> impossible to turn MEM_ACCESS off, becaue it is selected by x86, which leaves
> MEM_ACCESS enabled and unmodifiable.
modify arch/x86/Kconfig like:

-       select MEM_ACCESS_ALWAYS_ON
+       select MEM_ACCESS_ALWAYS_ON if !PV_SHIM_EXCLUSIVE

???

Juergen

> ---
>   tools/firmware/xen-dir/Makefile       | 2 +-
>   xen/arch/x86/configs/pvshim_defconfig | 5 ++++-
>   2 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/tools/firmware/xen-dir/Makefile b/tools/firmware/xen-dir/Makefile
> index 83597f0017..7435421251 100644
> --- a/tools/firmware/xen-dir/Makefile
> +++ b/tools/firmware/xen-dir/Makefile
> @@ -41,7 +41,7 @@ linkfarm.stamp: $(DEP_DIRS) $(DEP_FILES) FORCE
>   $(D): linkfarm.stamp
>         $(MAKE) -C $(D)/xen distclean
>   
> -$(D)/xen/.config: $(D)
> +$(D)/xen/.config: $(D) $(D)/xen/arch/x86/configs/pvshim_defconfig
>         $(MAKE) -C $(@D) KBUILD_DEFCONFIG=pvshim_defconfig XEN_CONFIG_EXPERT=y 
> defconfig
>   
>   xen-shim: $(D)/xen/.config
> diff --git a/xen/arch/x86/configs/pvshim_defconfig 
> b/xen/arch/x86/configs/pvshim_defconfig
> index 9710aa6238..329aaf9029 100644
> --- a/xen/arch/x86/configs/pvshim_defconfig
> +++ b/xen/arch/x86/configs/pvshim_defconfig
> @@ -5,6 +5,7 @@ CONFIG_PVH_GUEST=y
>   CONFIG_PV_SHIM=y
>   CONFIG_PV_SHIM_EXCLUSIVE=y
>   CONFIG_NR_CPUS=32
> +CONFIG_SCHED_NULL=y
>   # Disable features not used by the PV shim
>   # CONFIG_SHADOW_PAGING is not set
>   # CONFIG_BIGMEM is not set
> @@ -13,10 +14,12 @@ CONFIG_NR_CPUS=32
>   # CONFIG_KEXEC is not set
>   # CONFIG_XENOPROF is not set
>   # CONFIG_XSM is not set
> +# CONFIG_SCHED_CREDIT is not set
>   # CONFIG_SCHED_CREDIT2 is not set
>   # CONFIG_SCHED_RTDS is not set
>   # CONFIG_SCHED_ARINC653 is not set
> -# CONFIG_SCHED_NULL is not set
>   # CONFIG_LIVEPATCH is not set
>   # CONFIG_SUPPRESS_DUPLICATE_SYMBOL_WARNINGS is not set
>   # CONFIG_DEBUG is not set
> +# CONFIG_MEM_ACCESS_ALWAYS_ON is not set
> +# CONFIG_MEM_ACCESS is not set

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