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Re: [Qemu-devel] [PATCH] target/i386: enable A20 automatically in system


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH] target/i386: enable A20 automatically in system management mode
Date: Wed, 17 May 2017 10:18:23 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.1.0


On 16/05/2017 23:42, Kevin O'Connor wrote:
> 
> As for adding a new SeaBIOS build option to compile out support for
> A20 - that seems like a very small optimization that would risk memory
> corruption and hard to diagnose crashes.  SeaBIOS runs natively on
> real hardware (with coreboot and as a CSM on UEFI) as well as on
> QEMU/KVM.

Haswell (2013) no longer has A20 support (and hypervisors never had it,
not just KVM).

Thanks,

Paolo



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