From: Paolo Bonzini <pbonzini@redhat.com>
To: Kevin O'Connor <kevin@koconnor.net>
Cc: Jordan Justen <jordan.l.justen@intel.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH v7 1/4] isapc: Fix non-KVM qemu boot (read/write memory for isapc BIOS)
Date: Fri, 31 May 2013 14:48:17 +0200 [thread overview]
Message-ID: <51A89C11.8040108@redhat.com> (raw)
In-Reply-To: <20130531020612.GA18156@morn.localdomain>
Il 31/05/2013 04:06, Kevin O'Connor ha scritto:
> On Wed, May 29, 2013 at 01:27:24AM -0700, Jordan Justen wrote:
>> > The isapc machine with seabios currently requires the BIOS region
>> > to be read/write memory rather than read-only memory.
>> >
>> > KVM currently cannot support the BIOS as a ROM region, but qemu
>> > in non-KVM mode can. Based on this, isapc machine currently only
>> > works with KVM.
>> >
>> > To work-around this isapc issue, this change avoids marking the
>> > BIOS as readonly for isapc.
> How about changing the code to always make the ROM read/write (instead
> of doing it only on isapc). Currently, if the rom is marked as
> read-only, then SeaBIOS makes it read/write as the first thing it
> does. So, making it read-only doesn't really serve any purpose.
I don't think SeaBIOS can rely on the value of the PAM registers when it
is started via a CPU reset (INIT), can it?
Paolo
next prev parent reply other threads:[~2013-05-31 12:48 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-29 8:27 [Qemu-devel] [PATCH v7 0/4] KVM flash memory support Jordan Justen
2013-05-29 8:27 ` [Qemu-devel] [PATCH v7 1/4] isapc: Fix non-KVM qemu boot (read/write memory for isapc BIOS) Jordan Justen
2013-05-31 2:06 ` Kevin O'Connor
2013-05-31 4:41 ` Jordan Justen
2013-05-31 12:40 ` Laszlo Ersek
2013-05-31 12:48 ` Paolo Bonzini
2013-05-31 12:48 ` Paolo Bonzini [this message]
2013-06-01 3:44 ` Kevin O'Connor
2013-05-29 8:27 ` [Qemu-devel] [PATCH v7 2/4] kvm: add kvm_readonly_mem_enabled Jordan Justen
2013-05-29 8:27 ` [Qemu-devel] [PATCH v7 3/4] kvm: support using KVM_MEM_READONLY flag for regions Jordan Justen
2013-05-29 8:27 ` [Qemu-devel] [PATCH v7 4/4] pc_sysfw: allow flash (-pflash) memory to be used with KVM Jordan Justen
2013-05-31 18:48 ` [Qemu-devel] [PATCH v7 0/4] KVM flash memory support Anthony Liguori
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