KVM: SVM: Implement pause loop exit logic in SVM

Browse source

Bring the PLE(pause loop exit) logic to AMD svm driver.

While testing, we found this helping in situations where numerous
pauses are generated. Without these patches we could see continuos
VMEXITS due to pause interceptions. Tested it on AMD EPYC server with
boot parameter idle=poll on a VM with 32 vcpus to simulate extensive
pause behaviour. Here are VMEXITS in 10 seconds interval.

Pauses                  810199                  504
Total                   882184                  325415

Signed-off-by: Babu Moger <babu.moger@amd.com>
[Prevented the window from dropping below the initial value. - Radim]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

...

This commit is contained in:

Babu Moger 2018-03-16 16:37:26 -04:00 • committed by Radim Krčmář

parent 1d8fb44a72

commit 8566ac8b8e

2 changed files with 105 additions and 3 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

106

arch/x86/kvm/svm.c

View file

2

arch/x86/kvm/x86.h

View file