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[Qemu-devel] [PATCH 0/2] QEMU kvm: Adding paravirtual spinlock support f
From: |
Raghavendra K T |
Subject: |
[Qemu-devel] [PATCH 0/2] QEMU kvm: Adding paravirtual spinlock support for x86. |
Date: |
Fri, 23 Mar 2012 13:52:46 +0530 |
The patch, extends KVM-hypervisor and Linux guest running on
KVM-hypervisor to support pv-ticket spinlocks.
PV ticket spinlock helps to solve Lock Holder Preemption problem discussed in
http://www.amd64.org/fileadmin/user_upload/pub/LHP-commented_slides.pdf.
When spinlock is contended,a guest vcpu relinqueshes cpu by halt().
Correspondingly, One hypercall is introduced in KVM hypervisor,that allows
a vcpu to kick the halted vcpu to continue with execution.
Note:
Below patch should be applied only after corresponding
linux-header changes taken into qemu via scripts/update-linux-headers.sh script.
---
Changes in V3:
rename PVLOCK_KICK --> PV_UNHALT
add MSR related changes to aid migration
Changes in V2:
Drop the syncing kernel header changes. (Alex)
rename KICK_VCPU --> PVLOCK_KICK.
Raghavendra K T(2):
add PV_UNHALT feature support.
add support to get/set vcpu unhalt msr to aid migration
target-i386/cpu.h | 1 +
target-i386/kvm.c | 14 +++++++++++++-
2 files changed, 14 insertions(+), 1 deletions(-)
V5 Kernel changes:
https://lkml.org/lkml/2012/3/23/50
V4 kernel changes:
https://lkml.org/lkml/2012/1/14/66
Qemu changes for V4:
http://www.mail-archive.com/address@hidden/msg66450.html
V3 kernel Changes:
https://lkml.org/lkml/2011/11/30/62
V2 kernel changes :
https://lkml.org/lkml/2011/10/23/207
Previous discussions : (posted by Srivatsa V).
https://lkml.org/lkml/2010/7/26/24
https://lkml.org/lkml/2011/1/19/212
Qemu patch for V3:
http://lists.gnu.org/archive/html/qemu-devel/2011-12/msg00397.html
- [Qemu-devel] [PATCH 0/2] QEMU kvm: Adding paravirtual spinlock support for x86.,
Raghavendra K T <=