Merge tag 'kvm-3.6-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull KVM updates from Avi Kivity:
 "Highlights include
  - full big real mode emulation on pre-Westmere Intel hosts (can be
    disabled with emulate_invalid_guest_state=0)
  - relatively small ppc and s390 updates
  - PCID/INVPCID support in guests
  - EOI avoidance; 3.6 guests should perform better on 3.6 hosts on
    interrupt intensive workloads)
  - Lockless write faults during live migration
  - EPT accessed/dirty bits support for new Intel processors"

Fix up conflicts in:
 - Documentation/virtual/kvm/api.txt:

   Stupid subchapter numbering, added next to each other.

 - arch/powerpc/kvm/booke_interrupts.S:

   PPC asm changes clashing with the KVM fixes

 - arch/s390/include/asm/sigp.h, arch/s390/kvm/sigp.c:

   Duplicated commits through the kvm tree and the s390 tree, with
   subsequent edits in the KVM tree.

* tag 'kvm-3.6-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (93 commits)
  KVM: fix race with level interrupts
  x86, hyper: fix build with !CONFIG_KVM_GUEST
  Revert "apic: fix kvm build on UP without IOAPIC"
  KVM guest: switch to apic_set_eoi_write, apic_write
  apic: add apic_set_eoi_write for PV use
  KVM: VMX: Implement PCID/INVPCID for guests with EPT
  KVM: Add x86_hyper_kvm to complete detect_hypervisor_platform check
  KVM: PPC: Critical interrupt emulation support
  KVM: PPC: e500mc: Fix tlbilx emulation for 64-bit guests
  KVM: PPC64: booke: Set interrupt computation mode for 64-bit host
  KVM: PPC: bookehv: Add ESR flag to Data Storage Interrupt
  KVM: PPC: bookehv64: Add support for std/ld emulation.
  booke: Added crit/mc exception handler for e500v2
  booke/bookehv: Add host crit-watchdog exception support
  KVM: MMU: document mmu-lock and fast page fault
  KVM: MMU: fix kvm_mmu_pagetable_walk tracepoint
  KVM: MMU: trace fast page fault
  KVM: MMU: fast path of handling guest page fault
  KVM: MMU: introduce SPTE_MMU_WRITEABLE bit
  KVM: MMU: fold tlb flush judgement into mmu_spte_update
  ...

2 files changed, 43 insertions, 35 deletions

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index c552d1f4103f..d470ccbfabae 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -347,6 +347,7 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
         vcpu->arch.guest_fpregs.fpc = 0;
         asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc));
         vcpu->arch.sie_block->gbea = 1;
+        atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
 }
 
 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
diff --git a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
index 1ab2ce1611c5..56f80e1f98f7 100644
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -26,19 +26,23 @@ static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
         int rc;
 
         if (cpu_addr >= KVM_MAX_VCPUS)
-                return 3; /* not operational */
+                return SIGP_CC_NOT_OPERATIONAL;
 
         spin_lock(&fi->lock);
         if (fi->local_int[cpu_addr] == NULL)
-                rc = 3; /* not operational */
+                rc = SIGP_CC_NOT_OPERATIONAL;
         else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
-                  & CPUSTAT_STOPPED)) {
-                *reg &= 0xffffffff00000000UL;
-                rc = 1; /* status stored */
-        } else {
+                   & (CPUSTAT_ECALL_PEND | CPUSTAT_STOPPED)))
+                rc = SIGP_CC_ORDER_CODE_ACCEPTED;
+        else {
                 *reg &= 0xffffffff00000000UL;
-                *reg |= SIGP_STATUS_STOPPED;
-                rc = 1; /* status stored */
+                if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
+                    & CPUSTAT_ECALL_PEND)
+                        *reg |= SIGP_STATUS_EXT_CALL_PENDING;
+                if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
+                    & CPUSTAT_STOPPED)
+                        *reg |= SIGP_STATUS_STOPPED;
+                rc = SIGP_CC_STATUS_STORED;
         }
         spin_unlock(&fi->lock);
 
@@ -54,7 +58,7 @@ static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
         int rc;
 
         if (cpu_addr >= KVM_MAX_VCPUS)
-                return 3; /* not operational */
+                return SIGP_CC_NOT_OPERATIONAL;
 
         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
         if (!inti)
@@ -66,7 +70,7 @@ static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
         spin_lock(&fi->lock);
         li = fi->local_int[cpu_addr];
         if (li == NULL) {
-                rc = 3; /* not operational */
+                rc = SIGP_CC_NOT_OPERATIONAL;
                 kfree(inti);
                 goto unlock;
         }
@@ -77,7 +81,7 @@ static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
         if (waitqueue_active(&li->wq))
                 wake_up_interruptible(&li->wq);
         spin_unlock_bh(&li->lock);
-        rc = 0; /* order accepted */
+        rc = SIGP_CC_ORDER_CODE_ACCEPTED;
         VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
 unlock:
         spin_unlock(&fi->lock);
@@ -92,7 +96,7 @@ static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
         int rc;
 
         if (cpu_addr >= KVM_MAX_VCPUS)
-                return 3; /* not operational */
+                return SIGP_CC_NOT_OPERATIONAL;
 
         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
         if (!inti)
@@ -104,7 +108,7 @@ static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
         spin_lock(&fi->lock);
         li = fi->local_int[cpu_addr];
         if (li == NULL) {
-                rc = 3; /* not operational */
+                rc = SIGP_CC_NOT_OPERATIONAL;
                 kfree(inti);
                 goto unlock;
         }
@@ -115,7 +119,7 @@ static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
         if (waitqueue_active(&li->wq))
                 wake_up_interruptible(&li->wq);
         spin_unlock_bh(&li->lock);
-        rc = 0; /* order accepted */
+        rc = SIGP_CC_ORDER_CODE_ACCEPTED;
         VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
 unlock:
         spin_unlock(&fi->lock);
@@ -143,7 +147,7 @@ static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
 out:
         spin_unlock_bh(&li->lock);
 
-        return 0; /* order accepted */
+        return SIGP_CC_ORDER_CODE_ACCEPTED;
 }
 
 static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
@@ -153,12 +157,12 @@ static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
         int rc;
 
         if (cpu_addr >= KVM_MAX_VCPUS)
-                return 3; /* not operational */
+                return SIGP_CC_NOT_OPERATIONAL;
 
         spin_lock(&fi->lock);
         li = fi->local_int[cpu_addr];
         if (li == NULL) {
-                rc = 3; /* not operational */
+                rc = SIGP_CC_NOT_OPERATIONAL;
                 goto unlock;
         }
 
@@ -182,11 +186,11 @@ static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
 
         switch (parameter & 0xff) {
         case 0:
-                rc = 3; /* not operational */
+                rc = SIGP_CC_NOT_OPERATIONAL;
                 break;
         case 1:
         case 2:
-                rc = 0; /* order accepted */
+                rc = SIGP_CC_ORDER_CODE_ACCEPTED;
                 break;
         default:
                 rc = -EOPNOTSUPP;
@@ -207,21 +211,23 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
         address = address & 0x7fffe000u;
         if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
            copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
+                *reg &= 0xffffffff00000000UL;
                 *reg |= SIGP_STATUS_INVALID_PARAMETER;
-                return 1; /* invalid parameter */
+                return SIGP_CC_STATUS_STORED;
         }
 
         inti = kzalloc(sizeof(*inti), GFP_KERNEL);
         if (!inti)
-                return 2; /* busy */
+                return SIGP_CC_BUSY;
 
         spin_lock(&fi->lock);
         if (cpu_addr < KVM_MAX_VCPUS)
                 li = fi->local_int[cpu_addr];
 
         if (li == NULL) {
-                rc = 1; /* incorrect state */
-                *reg &= SIGP_STATUS_INCORRECT_STATE;
+                *reg &= 0xffffffff00000000UL;
+                *reg |= SIGP_STATUS_INCORRECT_STATE;
+                rc = SIGP_CC_STATUS_STORED;
                 kfree(inti);
                 goto out_fi;
         }
@@ -229,8 +235,9 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
         spin_lock_bh(&li->lock);
         /* cpu must be in stopped state */
         if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
-                rc = 1; /* incorrect state */
-                *reg &= SIGP_STATUS_INCORRECT_STATE;
+                *reg &= 0xffffffff00000000UL;
+                *reg |= SIGP_STATUS_INCORRECT_STATE;
+                rc = SIGP_CC_STATUS_STORED;
                 kfree(inti);
                 goto out_li;
         }
@@ -242,7 +249,7 @@ static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
         atomic_set(&li->active, 1);
         if (waitqueue_active(&li->wq))
                 wake_up_interruptible(&li->wq);
-        rc = 0; /* order accepted */
+        rc = SIGP_CC_ORDER_CODE_ACCEPTED;
 
         VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
 out_li:
@@ -259,21 +266,21 @@ static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
 
         if (cpu_addr >= KVM_MAX_VCPUS)
-                return 3; /* not operational */
+                return SIGP_CC_NOT_OPERATIONAL;
 
         spin_lock(&fi->lock);
         if (fi->local_int[cpu_addr] == NULL)
-                rc = 3; /* not operational */
+                rc = SIGP_CC_NOT_OPERATIONAL;
         else {
                 if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
                     & CPUSTAT_RUNNING) {
                         /* running */
-                        rc = 1;
+                        rc = SIGP_CC_ORDER_CODE_ACCEPTED;
                 } else {
                         /* not running */
                         *reg &= 0xffffffff00000000UL;
                         *reg |= SIGP_STATUS_NOT_RUNNING;
-                        rc = 0;
+                        rc = SIGP_CC_STATUS_STORED;
                 }
         }
         spin_unlock(&fi->lock);
@@ -286,23 +293,23 @@ static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
 
 static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
 {
-        int rc = 0;
         struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
         struct kvm_s390_local_interrupt *li;
+        int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
 
         if (cpu_addr >= KVM_MAX_VCPUS)
-                return 3; /* not operational */
+                return SIGP_CC_NOT_OPERATIONAL;
 
         spin_lock(&fi->lock);
         li = fi->local_int[cpu_addr];
         if (li == NULL) {
-                rc = 3; /* not operational */
+                rc = SIGP_CC_NOT_OPERATIONAL;
                 goto out;
         }
 
         spin_lock_bh(&li->lock);
         if (li->action_bits & ACTION_STOP_ON_STOP)
-                rc = 2; /* busy */
+                rc = SIGP_CC_BUSY;
         else
                 VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
                         cpu_addr);
@@ -377,7 +384,7 @@ int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
         case SIGP_RESTART:
                 vcpu->stat.instruction_sigp_restart++;
                 rc = __sigp_restart(vcpu, cpu_addr);
-                if (rc == 2) /* busy */
+                if (rc == SIGP_CC_BUSY)
                         break;
                 /* user space must know about restart */
         default: