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[Qemu-devel] [PATCH 29/31] kvm: Do not use qemu_fair_mutex
From: |
Marcelo Tosatti |
Subject: |
[Qemu-devel] [PATCH 29/31] kvm: Do not use qemu_fair_mutex |
Date: |
Mon, 24 Jan 2011 07:02:38 -0200 |
From: Jan Kiszka <address@hidden>
The imbalance in the hold time of qemu_global_mutex only exists in TCG
mode. In contrast to TCG VCPUs, KVM drops the global lock during guest
execution. We already avoid touching the fairness lock from the
IO-thread in KVM mode, so also stop using it from the VCPU threads.
Signed-off-by: Jan Kiszka <address@hidden>
Signed-off-by: Marcelo Tosatti <address@hidden>
---
cpus.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/cpus.c b/cpus.c
index 0309189..4c9928e 100644
--- a/cpus.c
+++ b/cpus.c
@@ -735,9 +735,7 @@ static sigset_t block_io_signals(void)
void qemu_mutex_lock_iothread(void)
{
if (kvm_enabled()) {
- qemu_mutex_lock(&qemu_fair_mutex);
qemu_mutex_lock(&qemu_global_mutex);
- qemu_mutex_unlock(&qemu_fair_mutex);
} else {
qemu_mutex_lock(&qemu_fair_mutex);
if (qemu_mutex_trylock(&qemu_global_mutex)) {
--
1.7.2.3
- [Qemu-devel] [PATCH 02/31] kvm: convert kvm_ioctl(KVM_CHECK_EXTENSION) to kvm_check_extension(), (continued)
- [Qemu-devel] [PATCH 02/31] kvm: convert kvm_ioctl(KVM_CHECK_EXTENSION) to kvm_check_extension(), Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 28/31] kvm: Flush coalesced mmio buffer on IO window exits, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 05/31] Add function for checking mca broadcast of CPU, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 04/31] Add "broadcast" option for mce command, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 01/31] kvm: Enable user space NMI injection for kvm guest, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 07/31] kvm: kvm_mce_inj_* subroutines for templated error injections, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 13/31] kvm: Fix coding style violations, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 08/31] kvm: introduce kvm_inject_x86_mce_on, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 14/31] kvm: x86: Swallow KVM_EXIT_SET_TPR, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 09/31] kvm: x86: Fix DPL write back of segment registers, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 29/31] kvm: Do not use qemu_fair_mutex,
Marcelo Tosatti <=
- [Qemu-devel] [PATCH 18/31] kvm: x86: Align kvm_arch_put_registers code with comment, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 10/31] kvm: x86: Remove obsolete SS.RPL/DPL aligment, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 21/31] kvm: x86: Fix xcr0 reset mismerge, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 20/31] kvm: x86: Remove redundant mp_state initialization, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 23/31] kvm: x86: Reset paravirtual MSRs, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 27/31] kvm: x86: Rework identity map and TSS setup for larger BIOS sizes, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 25/31] kvm: Drop smp_cpus argument from init functions, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 16/31] kvm: Improve reporting of fatal errors, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 06/31] kvm: introduce kvm_mce_in_progress, Marcelo Tosatti, 2011/01/24
- [Qemu-devel] [PATCH 12/31] kvm: x86: Fix a few coding style violations, Marcelo Tosatti, 2011/01/24