From: Paolo Bonzini <pbonzini@redhat.com>
To: Borislav Petkov <bp@alien8.de>, Maran Wilson <maran.wilson@oracle.com>
Cc: x86@kernel.org, xen-devel@lists.xenproject.org,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
jgross@suse.com, boris.ostrovsky@oracle.com, bp@suse.de,
dave.hansen@linux.intel.com, davem@davemloft.net,
gregkh@linuxfoundation.org, hpa@zytor.com, jpoimboe@redhat.com,
kirill.shutemov@linux.intel.com, luto@kernel.org,
mchehab@kernel.org, mingo@redhat.com, rdunlap@infradead.org,
tglx@linutronix.de, thomas.lendacky@amd.com, hch@infradead.org,
roger.pau@citrix.com, rkrcmar@redhat.com
Subject: Re: [PATCH v9 0/7] KVM: x86: Allow Qemu/KVM to use PVH entry point
Date: Thu, 13 Dec 2018 14:15:54 +0100 [thread overview]
Message-ID: <ec55cffa-e98b-a758-e615-8fe0688f31bb@redhat.com> (raw)
In-Reply-To: <20181212203901.GI6653@zn.tnic>
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...
next prev parent reply other threads:[~2018-12-13 13:15 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-10 19:05 [PATCH v9 0/7] KVM: x86: Allow Qemu/KVM to use PVH entry point Maran Wilson
2018-12-10 19:07 ` [PATCH v9 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN_PVH Maran Wilson
2018-12-11 13:22 ` Borislav Petkov
2018-12-10 19:07 ` [PATCH v9 2/7] xen/pvh: Move PVH entry code out of Xen specific tree Maran Wilson
2018-12-10 19:08 ` [PATCH v9 3/7] xen/pvh: Create a new file for Xen specific PVH code Maran Wilson
2018-12-10 19:08 ` [PATCH v9 4/7] xen/pvh: Move Xen specific PVH VM initialization out of common file Maran Wilson
2018-12-10 19:08 ` [PATCH v9 5/7] xen/pvh: Move Xen code for getting mem map via hcall " Maran Wilson
2018-12-10 19:09 ` [PATCH v9 6/7] xen/pvh: Add memory map pointer to hvm_start_info struct Maran Wilson
2018-12-10 19:09 ` [PATCH v9 7/7] KVM: x86: Allow Qemu/KVM to use PVH entry point Maran Wilson
2018-12-11 13:18 ` [PATCH v9 0/7] " Borislav Petkov
2018-12-11 19:29 ` Maran Wilson
2018-12-12 20:39 ` Borislav Petkov
2018-12-12 21:56 ` Maran Wilson
2018-12-13 13:15 ` Paolo Bonzini [this message]
2018-12-14 23:13 ` Boris Ostrovsky
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