From: Jan Kiszka <jan.kiszka@web.de>
To: Avi Kivity <avi@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: [Qemu-devel] Re: [PATCH v2 16/17] kvm: x86: Rework identity map and TSS setup for larger BIOS sizes
Date: Mon, 03 Jan 2011 18:19:23 +0100 [thread overview]
Message-ID: <4D22051B.5030600@web.de> (raw)
In-Reply-To: <4D220085.3040200@redhat.com>
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Am 03.01.2011 17:59, Avi Kivity wrote:
> On 01/03/2011 06:52 PM, Jan Kiszka wrote:
>> Am 03.01.2011 17:06, Avi Kivity wrote:
>> > On 01/03/2011 10:33 AM, Jan Kiszka wrote:
>> >> From: Jan Kiszka<jan.kiszka@siemens.com>
>> >>
>> >> First of all, we only need this EPT identity and TSS reservation on
>> >> Intel CPUs.
>> >
>> > kvm-amd will ignore it just fine. I'd like to keep arch differences
>> > away from userspace.
>>
>> And I would prefer to avoid needlessly cluttering the physical guest
>> address space where not needed. Long term, we could even give user space
>> a hint (unless it can test it directly) that this workaround is no
>> longer needed as the host Intel CPU supports true real mode.
>
> Having different physical address spaces based on the host cpu is bad,
> even disregarding live migration. If there's a real need, we can do it
> as an option. I don't see such a need though.
I see, migration is a killer argument.
Jan
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next prev parent reply other threads:[~2011-01-03 17:19 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-03 8:32 [Qemu-devel] [PATCH v2 00/17] [uq/master] Prepare for more qemu-kvm merging Jan Kiszka
2011-01-03 8:32 ` [Qemu-devel] [PATCH v2 01/17] kvm: Fix coding style violations Jan Kiszka
2011-01-03 8:32 ` [Qemu-devel] [PATCH v2 02/17] kvm: Drop return value of kvm_cpu_exec Jan Kiszka
2011-01-03 8:32 ` [Qemu-devel] [PATCH v2 03/17] kvm: Stop on all fatal exit reasons Jan Kiszka
2011-01-03 8:32 ` [Qemu-devel] [PATCH v2 04/17] kvm: Improve reporting of fatal errors Jan Kiszka
2011-01-03 8:32 ` [Qemu-devel] [PATCH v2 05/17] x86: Optionally dump code bytes on cpu_dump_state Jan Kiszka
2011-01-03 13:13 ` [Qemu-devel] [PATCH v3 " Jan Kiszka
2011-01-03 8:32 ` [Qemu-devel] [PATCH v2 06/17] kvm: x86: Align kvm_arch_put_registers code with comment Jan Kiszka
2011-01-03 8:32 ` [Qemu-devel] [PATCH v2 07/17] kvm: x86: Prepare kvm_get_mp_state for in-kernel irqchip Jan Kiszka
2011-01-03 8:32 ` [Qemu-devel] [PATCH v2 08/17] kvm: x86: Remove redundant mp_state initialization Jan Kiszka
2011-01-03 8:32 ` [Qemu-devel] [PATCH v2 09/17] kvm: x86: Fix xcr0 reset mismerge Jan Kiszka
2011-01-03 8:33 ` [Qemu-devel] [PATCH v2 10/17] kvm: x86: Refactor msr_star/hsave_pa setup and checks Jan Kiszka
2011-01-03 8:33 ` [Qemu-devel] [PATCH v2 11/17] kvm: x86: Reset paravirtual MSRs Jan Kiszka
2011-01-03 16:40 ` [Qemu-devel] " Glauber Costa
2011-01-03 16:46 ` Jan Kiszka
2011-01-03 16:51 ` Glauber Costa
2011-01-03 8:33 ` [Qemu-devel] [PATCH v2 12/17] kvm: x86: Drop MCE MSRs write back restrictions Jan Kiszka
2011-01-03 8:33 ` [Qemu-devel] [PATCH v2 13/17] kvm: Eliminate KVMState arguments Jan Kiszka
2011-01-03 11:13 ` [Qemu-devel] " Alexander Graf
2011-01-03 8:33 ` [Qemu-devel] [PATCH v2 14/17] kvm: x86: Introduce kvmclock device to save/restore its state Jan Kiszka
2011-01-03 16:04 ` [Qemu-devel] " Avi Kivity
2011-01-03 16:30 ` Jan Kiszka
2011-01-03 16:39 ` Glauber Costa
2011-01-03 16:41 ` Avi Kivity
2011-01-03 16:38 ` Glauber Costa
2011-01-03 16:37 ` Glauber Costa
2011-01-03 16:48 ` Jan Kiszka
2011-01-03 8:33 ` [Qemu-devel] [PATCH v2 15/17] kvm: Drop smp_cpus argument from init functions Jan Kiszka
2011-01-03 8:33 ` [Qemu-devel] [PATCH v2 16/17] kvm: x86: Rework identity map and TSS setup for larger BIOS sizes Jan Kiszka
2011-01-03 16:06 ` [Qemu-devel] " Avi Kivity
2011-01-03 16:52 ` Jan Kiszka
2011-01-03 16:59 ` Avi Kivity
2011-01-03 17:19 ` Jan Kiszka [this message]
2011-01-03 8:33 ` [Qemu-devel] [PATCH v2 17/17] kvm: Drop dependencies on very old capabilities Jan Kiszka
2011-01-03 16:08 ` [Qemu-devel] " Avi Kivity
2011-01-03 16:54 ` Jan Kiszka
2011-01-03 17:01 ` Avi Kivity
2011-01-03 17:24 ` Jan Kiszka
2011-01-03 12:44 ` [Qemu-devel] [PATCH 18/17] kvm: Flush coalesced mmio buffer on IO window exits Jan Kiszka
2011-01-03 16:09 ` [Qemu-devel] Re: [PATCH v2 00/17] [uq/master] Prepare for more qemu-kvm merging Avi Kivity
2011-01-04 8:42 ` Jan Kiszka
2011-01-04 9:02 ` Avi Kivity
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