Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-09-29 03:13:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

KVM: Resolve RCU vs. async page fault problem

Browse Source 
"Page ready" async PF can kick vcpu out of idle state much like IRQ.
We need to tell RCU about this.

Reported-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2012-04-04 15:30:33 +03:00 committed by Avi Kivity
parent 8a4032496f
commit e08759215b
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kernel/kvm.c
View File

@ -38,6 +38,7 @@
#include <asm/traps.h>
#include <asm/desc.h>
#include <asm/tlbflush.h>
#include <asm/idle.h>
static int kvmapf = 1;
@ -253,7 +254,10 @@ do_async_page_fault(struct pt_regs *regs, unsigned long error_code)
kvm_async_pf_task_wait((u32)read_cr2());
break;
case KVM_PV_REASON_PAGE_READY:
rcu_irq_enter();
exit_idle();
kvm_async_pf_task_wake((u32)read_cr2());
rcu_irq_exit();
break;
}
}