Merge tag 'kvm-s390-20140130' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

Two new features are added by this patch set:
- The floating interrupt controller (flic) that allows us to inject,
  clear and inspect non-vcpu local interrupts. This also gives us an
  opportunity to fix deficiencies in our existing interrupt definitions.
- Support for asynchronous page faults via the pfault mechanism. Testing
  show significant guest performance improvements under host swap.

4 files changed, 47 insertions, 33 deletions

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index eef3dd3fd9a9..2c69ba285e81 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -16,6 +16,7 @@
 #include <linux/hrtimer.h>
 #include <linux/interrupt.h>
 #include <linux/kvm_host.h>
+#include <linux/kvm.h>
 #include <asm/debug.h>
 #include <asm/cpu.h>
 
@@ -168,18 +169,6 @@ struct kvm_vcpu_stat {
         u32 diagnose_9c;
 };
 
-struct kvm_s390_io_info {
-        __u16        subchannel_id;            /* 0x0b8 */
-        __u16        subchannel_nr;            /* 0x0ba */
-        __u32        io_int_parm;              /* 0x0bc */
-        __u32        io_int_word;              /* 0x0c0 */
-};
-
-struct kvm_s390_ext_info {
-        __u32 ext_params;
-        __u64 ext_params2;
-};
-
 #define PGM_OPERATION            0x01
 #define PGM_PRIVILEGED_OP        0x02
 #define PGM_EXECUTE              0x03
@@ -188,27 +177,6 @@ struct kvm_s390_ext_info {
 #define PGM_SPECIFICATION        0x06
 #define PGM_DATA                 0x07
 
-struct kvm_s390_pgm_info {
-        __u16 code;
-};
-
-struct kvm_s390_prefix_info {
-        __u32 address;
-};
-
-struct kvm_s390_extcall_info {
-        __u16 code;
-};
-
-struct kvm_s390_emerg_info {
-        __u16 code;
-};
-
-struct kvm_s390_mchk_info {
-        __u64 cr14;
-        __u64 mcic;
-};
-
 struct kvm_s390_interrupt_info {
         struct list_head list;
         u64     type;
@@ -246,6 +214,7 @@ struct kvm_s390_float_interrupt {
         unsigned long idle_mask[(KVM_MAX_VCPUS + sizeof(long) - 1)
                                 / sizeof(long)];
         struct kvm_s390_local_interrupt *local_int[KVM_MAX_VCPUS];
+        unsigned int irq_count;
 };
 
 
@@ -262,6 +231,10 @@ struct kvm_vcpu_arch {
                 u64             stidp_data;
         };
         struct gmap *gmap;
+#define KVM_S390_PFAULT_TOKEN_INVALID   (-1UL)
+        unsigned long pfault_token;
+        unsigned long pfault_select;
+        unsigned long pfault_compare;
 };
 
 struct kvm_vm_stat {
@@ -275,6 +248,7 @@ struct kvm_arch{
         struct sca_block *sca;
         debug_info_t *dbf;
         struct kvm_s390_float_interrupt float_int;
+        struct kvm_device *flic;
         struct gmap *gmap;
         int css_support;
 };
@@ -287,6 +261,24 @@ static inline bool kvm_is_error_hva(unsigned long addr)
         return IS_ERR_VALUE(addr);
 }
 
+#define ASYNC_PF_PER_VCPU       64
+struct kvm_vcpu;
+struct kvm_async_pf;
+struct kvm_arch_async_pf {
+        unsigned long pfault_token;
+};
+
+bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu);
+
+void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
+                               struct kvm_async_pf *work);
+
+void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
+                                     struct kvm_async_pf *work);
+
+void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
+                                 struct kvm_async_pf *work);
+
 extern int sie64a(struct kvm_s390_sie_block *, u64 *);
 extern char sie_exit;
 #endif
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 2204400d0bd5..66101f6c6d81 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -767,6 +767,7 @@ static inline void pgste_set_pte(pte_t *ptep, pte_t entry)
  * @table: pointer to the page directory
  * @asce: address space control element for gmap page table
  * @crst_list: list of all crst tables used in the guest address space
+ * @pfault_enabled: defines if pfaults are applicable for the guest
  */
 struct gmap {
         struct list_head list;
@@ -775,6 +776,7 @@ struct gmap {
         unsigned long asce;
         void *private;
         struct list_head crst_list;
+        bool pfault_enabled;
 };
 
 /**
diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h
index 0a876bc543d3..dc5fc4f90e52 100644
--- a/arch/s390/include/asm/processor.h
+++ b/arch/s390/include/asm/processor.h
@@ -79,6 +79,7 @@ struct thread_struct {
         unsigned long ksp;              /* kernel stack pointer             */
         mm_segment_t mm_segment;
         unsigned long gmap_addr;        /* address of last gmap fault. */
+        unsigned int gmap_pfault;       /* signal of a pending guest pfault */
         struct per_regs per_user;       /* User specified PER registers */
         struct per_event per_event;     /* Cause of the last PER trap */
         unsigned long per_flags;        /* Flags to control debug behavior */
diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
index d25da598ec62..cb4c1eb8a0a5 100644
--- a/arch/s390/include/uapi/asm/kvm.h
+++ b/arch/s390/include/uapi/asm/kvm.h
@@ -16,6 +16,22 @@
 
 #define __KVM_S390
 
+/* Device control API: s390-specific devices */
+#define KVM_DEV_FLIC_GET_ALL_IRQS       1
+#define KVM_DEV_FLIC_ENQUEUE            2
+#define KVM_DEV_FLIC_CLEAR_IRQS         3
+#define KVM_DEV_FLIC_APF_ENABLE         4
+#define KVM_DEV_FLIC_APF_DISABLE_WAIT   5
+/*
+ * We can have up to 4*64k pending subchannels + 8 adapter interrupts,
+ * as well as up  to ASYNC_PF_PER_VCPU*KVM_MAX_VCPUS pfault done interrupts.
+ * There are also sclp and machine checks. This gives us
+ * sizeof(kvm_s390_irq)*(4*65536+8+64*64+1+1) = 72 * 266250 = 19170000
+ * Lets round up to 8192 pages.
+ */
+#define KVM_S390_MAX_FLOAT_IRQS 266250
+#define KVM_S390_FLIC_MAX_BUFFER        0x2000000
+
 /* for KVM_GET_REGS and KVM_SET_REGS */
 struct kvm_regs {
         /* general purpose regs for s390 */
@@ -57,4 +73,7 @@ struct kvm_sync_regs {
 #define KVM_REG_S390_EPOCHDIFF  (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x2)
 #define KVM_REG_S390_CPU_TIMER  (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x3)
 #define KVM_REG_S390_CLOCK_COMP (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x4)
+#define KVM_REG_S390_PFTOKEN    (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x5)
+#define KVM_REG_S390_PFCOMPARE  (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x6)
+#define KVM_REG_S390_PFSELECT   (KVM_REG_S390 | KVM_REG_SIZE_U64 | 0x7)
 #endif