From: Paolo Bonzini <pbonzini@redhat.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Jessica Yu <jeyu@kernel.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Matthias Maennich <maennich@google.com>
Subject: Re: [PATCH 03/13] kvm: monolithic: fixup x86-32 build
Date: Fri, 8 Nov 2019 22:02:52 +0100 [thread overview]
Message-ID: <9a3d2936-bd26-430f-a962-9b0f6fe0c2a0@redhat.com> (raw)
In-Reply-To: <20191108200103.GA532@redhat.com>
On 08/11/19 21:01, Andrea Arcangeli wrote:
> On Fri, Nov 08, 2019 at 08:51:04PM +0100, Paolo Bonzini wrote:
>> I suppose we could use code patching mechanism to avoid the retpolines.
>> Andrea, what do you think about that? That would have the advantage
>> that we won't have to remove kvm_x86_ops. :)
>
> page 17 covers pvops:
>
> https://people.redhat.com/~aarcange/slides/2019-KVM-monolithic.pdf
You can patch call instructions directly using text_poke when
kvm_intel.ko or kvm_amd.ko, I'm not sure why that would be worse for TLB
or RAM usage. The hard part is recording the location of the call sites
using some pushsection/popsection magic.
Paolo
next prev parent reply other threads:[~2019-11-08 21:02 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-04 22:59 [PATCH 00/13] KVM monolithic v3 Andrea Arcangeli
2019-11-04 22:59 ` [PATCH 01/13] KVM: monolithic: x86: remove kvm.ko Andrea Arcangeli
2019-11-04 22:59 ` [PATCH 02/13] KVM: monolithic: x86: convert the kvm_x86_ops and kvm_pmu_ops methods to external functions Andrea Arcangeli
2019-11-04 22:59 ` [PATCH 03/13] kvm: monolithic: fixup x86-32 build Andrea Arcangeli
2019-11-05 10:04 ` Paolo Bonzini
2019-11-05 10:37 ` Paolo Bonzini
2019-11-05 13:54 ` Andrea Arcangeli
2019-11-05 14:09 ` Paolo Bonzini
2019-11-05 14:56 ` Andrea Arcangeli
2019-11-05 15:10 ` Paolo Bonzini
2019-11-08 13:56 ` Jessica Yu
2019-11-08 19:51 ` Paolo Bonzini
2019-11-08 20:01 ` Andrea Arcangeli
2019-11-08 21:02 ` Paolo Bonzini [this message]
2019-11-08 21:26 ` Andrea Arcangeli
2019-11-08 23:10 ` Paolo Bonzini
2019-11-09 3:30 ` Masahiro Yamada
2019-11-04 22:59 ` [PATCH 04/13] KVM: monolithic: x86: handle the request_immediate_exit variation Andrea Arcangeli
2019-11-04 22:59 ` [PATCH 05/13] KVM: monolithic: add more section prefixes Andrea Arcangeli
2019-11-05 10:16 ` Paolo Bonzini
2019-11-04 22:59 ` [PATCH 06/13] KVM: monolithic: x86: remove __exit section prefix from machine_unsetup Andrea Arcangeli
2019-11-05 10:16 ` Paolo Bonzini
2019-11-04 22:59 ` [PATCH 07/13] KVM: monolithic: x86: remove __init section prefix from kvm_x86_cpu_has_kvm_support Andrea Arcangeli
2019-11-05 10:16 ` Paolo Bonzini
2019-11-04 22:59 ` [PATCH 08/13] KVM: monolithic: remove exports Andrea Arcangeli
2019-11-04 22:59 ` [PATCH 09/13] KVM: monolithic: x86: drop the kvm_pmu_ops structure Andrea Arcangeli
2019-11-04 22:59 ` [PATCH 10/13] KVM: x86: optimize more exit handlers in vmx.c Andrea Arcangeli
2019-11-05 10:20 ` Paolo Bonzini
2019-11-04 22:59 ` [PATCH 11/13] KVM: retpolines: x86: eliminate retpoline from vmx.c exit handlers Andrea Arcangeli
2019-11-05 10:20 ` Paolo Bonzini
2019-11-04 23:00 ` [PATCH 12/13] KVM: retpolines: x86: eliminate retpoline from svm.c " Andrea Arcangeli
2019-11-05 10:21 ` Paolo Bonzini
2019-11-04 23:00 ` [PATCH 13/13] x86: retpolines: eliminate retpoline from msr event handlers Andrea Arcangeli
2019-11-05 10:21 ` Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=9a3d2936-bd26-430f-a962-9b0f6fe0c2a0@redhat.com \
--to=pbonzini@redhat.com \
--cc=aarcange@redhat.com \
--cc=jeyu@kernel.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=maennich@google.com \
--cc=sean.j.christopherson@intel.com \
--cc=vkuznets@redhat.com \
--cc=yamada.masahiro@socionext.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).