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Re: [Qemu-devel] [PATCH v3] s390: autodetect map private

From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH v3] s390: autodetect map private
Date: Mon, 18 Jun 2012 15:44:51 +0200

On 15.06.2012, at 17:10, Christian Borntraeger wrote:

> By default qemu will use MAP_PRIVATE for guest pages. This will write
> protect pages and thus break on s390 systems that dont support this feature.
> Therefore qemu has a hack to always use MAP_SHARED for s390. But MAP_SHARED
> has other problems (no dirty pages tracking, a lot more swap overhead etc.)
> Newer systems allow the distinction via KVM_CAP_S390_COW. With this feature
> qemu can use the standard qemu alloc if available, otherwise it will use
> the old s390 hack.

Thanks, applied to s390-next.


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