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[Qemu-devel] Re: [PATCH v2 16/17] kvm: x86: Rework identity map and TSS
From: |
Jan Kiszka |
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 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
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<address@hidden>
>> >>
>> >> 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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- [Qemu-devel] Re: [PATCH v2 14/17] kvm: x86: Introduce kvmclock device to save/restore its state, (continued)
[Qemu-devel] [PATCH v2 15/17] kvm: Drop smp_cpus argument from init functions, Jan Kiszka, 2011/01/03
[Qemu-devel] [PATCH v2 11/17] kvm: x86: Reset paravirtual MSRs, Jan Kiszka, 2011/01/03
[Qemu-devel] [PATCH v2 13/17] kvm: Eliminate KVMState arguments, Jan Kiszka, 2011/01/03
[Qemu-devel] [PATCH v2 06/17] kvm: x86: Align kvm_arch_put_registers code with comment, Jan Kiszka, 2011/01/03
[Qemu-devel] [PATCH v2 10/17] kvm: x86: Refactor msr_star/hsave_pa setup and checks, Jan Kiszka, 2011/01/03
[Qemu-devel] [PATCH v2 17/17] kvm: Drop dependencies on very old capabilities, Jan Kiszka, 2011/01/03