From: Carsten Otte <cotte@de.ibm.com>
Date: Sun, 24 Jul 2011 08:48:23 +0000 (+0200)
Subject: [S390] remove kvm mmu reload on s390
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f7850c92884b40915001e332a0a33ed4f10158e8;p=linux-beck.git

[S390] remove kvm mmu reload on s390

This patch removes the mmu reload logic for kvm on s390. Via Martin's
new gmap interface, we can safely add or remove memory slots while
guest CPUs are in-flight. Thus, the mmu reload logic is not needed
anymore.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 5a99f342fd0b..f17296e4fc89 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -294,7 +294,6 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
 {
 	atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | CPUSTAT_SM);
-	set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests);
 	vcpu->arch.sie_block->ecb   = 6;
 	vcpu->arch.sie_block->eca   = 0xC1002001U;
 	vcpu->arch.sie_block->fac   = (int) (long) facilities;
@@ -485,10 +484,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	sigset_t sigsaved;
 
 rerun_vcpu:
-	if (vcpu->requests)
-		if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
-			kvm_s390_vcpu_set_mem(vcpu);
-
 	if (vcpu->sigset_active)
 		sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
 
@@ -701,21 +696,13 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
 				struct kvm_memory_slot old,
 				int user_alloc)
 {
-	int i, rc;
-	struct kvm_vcpu *vcpu;
+	int rc;
 
 
 	rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
 		mem->guest_phys_addr, mem->memory_size);
 	if (rc)
-		return;
-
-	/* request update of sie control block for all available vcpus */
-	kvm_for_each_vcpu(i, vcpu, kvm) {
-		if (test_and_set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
-			continue;
-		kvm_s390_inject_sigp_stop(vcpu, ACTION_RELOADVCPU_ON_STOP);
-	}
+		printk(KERN_WARNING "kvm-s390: failed to commit memory region\n");
 	return;
 }
 
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index 63e5190776e9..99b0b7597115 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -58,10 +58,6 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code);
 int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action);
 
-static inline void kvm_s390_vcpu_set_mem(struct kvm_vcpu *vcpu)
-{
-}
-
 /* implemented in priv.c */
 int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
 int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);