From: Paolo Bonzini <pbonzini@redhat.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Gleb Natapov <gleb@kernel.org>, kvm <kvm@vger.kernel.org>
Subject: Re: [RFC][PATCH] KVM: nVMX: Leave VMX mode on apparent CPU reset
Date: Tue, 17 Dec 2013 14:25:26 +0100 [thread overview]
Message-ID: <52B050C6.5090407@redhat.com> (raw)
In-Reply-To: <52AEC8B2.7010602@siemens.com>
Il 16/12/2013 10:32, Jan Kiszka ha scritto:
> As long as we do not expose all the VMX related states to user space,
> there is no way to properly reset a VCPU when VMX is enabled. Emulate
> this for now by catching host-side clearings of the feature control MSR.
> This allows to reboot a VM while it is running some hypervisor code.
>
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
>
> Better ideas? Or continue to leave it as it is?
The final vmx_vcpu_reset is the only really ugly part, but it is
_really_ ugly... Can you modify QEMU to restore MSRs first, and reduce
vmx_reset_nested to just
if (is_guest_mode(vcpu))
nested_vmx_vmexit(vcpu);
free_nested(vmx);
?
Paolo
next prev parent reply other threads:[~2013-12-17 13:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-16 9:32 [RFC][PATCH] KVM: nVMX: Leave VMX mode on apparent CPU reset Jan Kiszka
2013-12-17 13:25 ` Paolo Bonzini [this message]
2013-12-17 14:40 ` Jan Kiszka
2013-12-17 14:43 ` Paolo Bonzini
2013-12-30 20:02 ` Marcelo Tosatti
2013-12-30 20:05 ` Marcelo Tosatti
2013-12-30 20:02 ` Marcelo Tosatti
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=52B050C6.5090407@redhat.com \
--to=pbonzini@redhat.com \
--cc=gleb@kernel.org \
--cc=jan.kiszka@siemens.com \
--cc=kvm@vger.kernel.org \
/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