Re: [PATCH] x86: kvm: use alternatives for VMCALL vs. VMMCALL if kernel text is read-only

[Paolo Bonzini]

Il 22/09/2014 21:43, Borislav Petkov ha scritto:
>> > On x86_64, kernel text mappings are mapped read-only with CONFIG_DEBUG_RODATA.
> Hmm, that depends on DEBUG_KERNEL.
> 
> I think you're actually talking about distro kernels which enable
> CONFIG_DEBUG_RODATA, right?

This is for guest kernels, so it's not necessarily distro kernels.
Anyone who compiles their kernel with CONFIG_DEBUG_RODATA + PV spinlocks
would not be able to run it on AMD.

Paolo
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