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Commit e0875921 authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
Browse files

KVM: Resolve RCU vs. async page fault problem 



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

Reported-by: default avatarSasha Levin <levinsasha928@gmail.com>
Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Reviewed-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 8a403249

arch/x86/kernel/kvm.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

	}

}