[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 5a99f342fd0b67418b36c6a4cd174b6006303255..f17296e4fc89df28f52f78812eaf42bee8e94d4c 100644 (file)
--- 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 63e5190776e9f9e9a6fe3dc8447bf560363a471f..99b0b7597115e023396953e7748f260d8d469091 100644 (file)
--- 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);