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Re: [Xen-devel] [PATCH v9 0/7] KVM: x86: Allow Qemu/KVM to use PVH entry point


  • To: Borislav Petkov <bp@xxxxxxxxx>, Maran Wilson <maran.wilson@xxxxxxxxxx>
  • From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
  • Date: Thu, 13 Dec 2018 14:15:54 +0100
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  • Cc: kvm@xxxxxxxxxxxxxxx, rkrcmar@xxxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, hpa@xxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, x86@xxxxxxxxxx, hch@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, bp@xxxxxxx, thomas.lendacky@xxxxxxx, luto@xxxxxxxxxx, jpoimboe@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, mchehab@xxxxxxxxxx, jgross@xxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, rdunlap@xxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, davem@xxxxxxxxxxxxx, kirill.shutemov@xxxxxxxxxxxxxxx, roger.pau@xxxxxxxxxx
  • Delivery-date: Thu, 13 Dec 2018 13:16:08 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 12/12/18 21:39, Borislav Petkov wrote:
> On Tue, Dec 11, 2018 at 11:29:21AM -0800, Maran Wilson wrote:
>> Is your question about what options you need to provide to Qemu? Or is your
>> question about the SW implementation choices?
>>
>> Assuming the former...
> Yeah, that's what I wanted to know. But looking at it, I'm booting
> bzImage here just as quickly and as flexible so I don't see the
> advantage of this new method for my use case here of booting kernels
> in qemu.

It's not firmware that is slow, decompression is.  Unlike Xen, which is
using PVH with a regular bzImage and decompression in the host, KVM is
using PVH to boot a vmlinux with no decompression at all.

Paolo

> But maybe there's a good use case where firmware is slow and one doesn't
> really wanna noodle through it or when one does start a gazillion VMs
> per second or whatever...


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