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Re: [Xen-devel] [PATCH RFC] x86/shim: Refresh pvshim_defconfig
- To: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 26 Jul 2019 13:58:28 +0100
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- Cc: Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 26 Jul 2019 12:58:52 +0000
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On 26/07/2019 13:55, Tamas K Lengyel wrote:
> On Fri, Jul 26, 2019 at 4:11 AM Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> 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.
> We never made it configurable to have MEM_ACCESS be disabled on x86.
> The option only exists because when I started moving vm_event to
> common code it had to be disabled for ARM at first. Then it looks like
> Stefano did make it configurable for ARM so there it can actually be
> disabled.
Is it something we could consider making configurable at this point?
Its certainly something we'd want to turn off in the PV shim build.
While thinking about it, it is specific to HVM guests, so ought to
depend on CONFIG_HVM anyway, which might be the easiest way to exclude
it for the PV shim build if we don't want to make it actively
configurable yet.
~Andrew
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