From: Christoph Egger <Christoph.Egger@amd.com>
To: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: [PATCH] nestedsvm: reduce TLB flushes
Date: Wed, 18 May 2011 17:26:06 +0200 [thread overview]
Message-ID: <4DD3E50E.4030607@amd.com> (raw)
[-- Attachment #1: Type: text/plain, Size: 575 bytes --]
Reduce TLB flushes:
1. When we update the cr3 during VMRUN/VMEXIT emulation
we toggle between n1asid and n2asid forth and back
=> no TLB flush needed
2. Only flush n1asid or n2asid depending on vcpu guest mode
and not both unconditionally.
Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>
--
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Einsteinring 24, 85689 Dornach b. Muenchen
Geschaeftsfuehrer: Alberto Bozzo, Andrew Bowd
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632
[-- Attachment #2: xen_nh_asid.diff --]
[-- Type: text/plain, Size: 906 bytes --]
diff -r 0e45a2e91f17 xen/arch/x86/hvm/svm/svm.c
--- a/xen/arch/x86/hvm/svm/svm.c Thu May 12 14:35:58 2011 +0200
+++ b/xen/arch/x86/hvm/svm/svm.c Wed May 18 17:26:16 2011 +0200
@@ -450,7 +452,19 @@ static void svm_update_guest_cr(struct v
break;
case 3:
vmcb_set_cr3(vmcb, v->arch.hvm_vcpu.hw_cr[3]);
- hvm_asid_flush_vcpu(v);
+ if ( !nestedhvm_enabled(v->domain) ) {
+ hvm_asid_flush_vcpu(v);
+ break;
+ }
+ if ( nestedhvm_vmswitch_in_progress(v) )
+ /* During VMRUN/VMEXIT emulation we toggle between
+ * n1asid and n2asid. */
+ break;
+
+ if ( nestedhvm_vcpu_in_guestmode(v) )
+ hvm_asid_flush_vcpu_asid(&vcpu_nestedhvm(v).nv_n2asid);
+ else
+ hvm_asid_flush_vcpu_asid(&v->arch.hvm_vcpu.n1asid);
break;
case 4:
value = HVM_CR4_HOST_MASK;
[-- Attachment #3: Type: text/plain, Size: 138 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
reply other threads:[~2011-05-18 15:26 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
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=4DD3E50E.4030607@amd.com \
--to=christoph.egger@amd.com \
--cc=xen-devel@lists.xensource.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).