KVM: s390: arch backend for the kvm kernel module
This patch contains the port of Qumranet's kvm kernel module to IBM zSeries
(aka s390x, mainframe) architecture. It uses the mainframe's virtualization
instruction SIE to run virtual machines with up to 64 virtual CPUs each.
This port is only usable on 64bit host kernels, and can only run 64bit guest
kernels. However, running 31bit applications in guest userspace is possible.
The following source files are introduced by this patch
arch/s390/kvm/kvm-s390.c similar to arch/x86/kvm/x86.c, this implements all
arch callbacks for kvm. __vcpu_run calls back into
sie64a to enter the guest machine context
arch/s390/kvm/sie64a.S assembler function sie64a, which enters guest
context via SIE, and switches world before and after that
include/asm-s390/kvm_host.h contains all vital data structures needed to run
virtual machines on the mainframe
include/asm-s390/kvm.h defines kvm_regs and friends for user access to
guest register content
arch/s390/kvm/gaccess.h functions similar to uaccess to access guest memory
arch/s390/kvm/kvm-s390.h header file for kvm-s390 internals, extended by
later patches
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/include/asm-s390/Kbuild b/include/asm-s390/Kbuild
index e92b429..13c9805 100644
--- a/include/asm-s390/Kbuild
+++ b/include/asm-s390/Kbuild
@@ -7,6 +7,7 @@
header-y += ucontext.h
header-y += vtoc.h
header-y += zcrypt.h
+header-y += kvm.h
unifdef-y += cmb.h
unifdef-y += debug.h
diff --git a/include/asm-s390/kvm.h b/include/asm-s390/kvm.h
index 573f2a3..d74002f 100644
--- a/include/asm-s390/kvm.h
+++ b/include/asm-s390/kvm.h
@@ -1,6 +1,45 @@
#ifndef __LINUX_KVM_S390_H
#define __LINUX_KVM_S390_H
-/* s390 does not support KVM */
+/*
+ * asm-s390/kvm.h - KVM s390 specific structures and definitions
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ * Author(s): Carsten Otte <cotte@de.ibm.com>
+ * Christian Borntraeger <borntraeger@de.ibm.com>
+ */
+#include <asm/types.h>
+
+/* for KVM_GET_IRQCHIP and KVM_SET_IRQCHIP */
+struct kvm_pic_state {
+ /* no PIC for s390 */
+};
+
+struct kvm_ioapic_state {
+ /* no IOAPIC for s390 */
+};
+
+/* for KVM_GET_REGS and KVM_SET_REGS */
+struct kvm_regs {
+ /* general purpose regs for s390 */
+ __u64 gprs[16];
+};
+
+/* for KVM_GET_SREGS and KVM_SET_SREGS */
+struct kvm_sregs {
+ __u32 acrs[16];
+ __u64 crs[16];
+};
+
+/* for KVM_GET_FPU and KVM_SET_FPU */
+struct kvm_fpu {
+ __u32 fpc;
+ __u64 fprs[16];
+};
#endif
diff --git a/include/asm-s390/kvm_host.h b/include/asm-s390/kvm_host.h
new file mode 100644
index 0000000..c9d6533
--- /dev/null
+++ b/include/asm-s390/kvm_host.h
@@ -0,0 +1,127 @@
+/*
+ * asm-s390/kvm_host.h - definition for kernel virtual machines on s390
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ * Author(s): Carsten Otte <cotte@de.ibm.com>
+ */
+
+
+#ifndef ASM_KVM_HOST_H
+#define ASM_KVM_HOST_H
+#include <linux/kvm_host.h>
+#include <asm/debug.h>
+
+#define KVM_MAX_VCPUS 64
+#define KVM_MEMORY_SLOTS 32
+/* memory slots that does not exposed to userspace */
+#define KVM_PRIVATE_MEM_SLOTS 4
+
+struct kvm_guest_debug {
+};
+
+struct sca_entry {
+ atomic_t scn;
+ __u64 reserved;
+ __u64 sda;
+ __u64 reserved2[2];
+} __attribute__((packed));
+
+
+struct sca_block {
+ __u64 ipte_control;
+ __u64 reserved[5];
+ __u64 mcn;
+ __u64 reserved2;
+ struct sca_entry cpu[64];
+} __attribute__((packed));
+
+#define KVM_PAGES_PER_HPAGE 256
+
+#define CPUSTAT_HOST 0x80000000
+#define CPUSTAT_WAIT 0x10000000
+#define CPUSTAT_ECALL_PEND 0x08000000
+#define CPUSTAT_STOP_INT 0x04000000
+#define CPUSTAT_IO_INT 0x02000000
+#define CPUSTAT_EXT_INT 0x01000000
+#define CPUSTAT_RUNNING 0x00800000
+#define CPUSTAT_RETAINED 0x00400000
+#define CPUSTAT_TIMING_SUB 0x00020000
+#define CPUSTAT_SIE_SUB 0x00010000
+#define CPUSTAT_RRF 0x00008000
+#define CPUSTAT_SLSV 0x00004000
+#define CPUSTAT_SLSR 0x00002000
+#define CPUSTAT_ZARCH 0x00000800
+#define CPUSTAT_MCDS 0x00000100
+#define CPUSTAT_SM 0x00000080
+#define CPUSTAT_G 0x00000008
+#define CPUSTAT_J 0x00000002
+#define CPUSTAT_P 0x00000001
+
+struct sie_block {
+ atomic_t cpuflags; /* 0x0000 */
+ __u32 prefix; /* 0x0004 */
+ __u8 reserved8[32]; /* 0x0008 */
+ __u64 cputm; /* 0x0028 */
+ __u64 ckc; /* 0x0030 */
+ __u64 epoch; /* 0x0038 */
+ __u8 reserved40[4]; /* 0x0040 */
+ __u16 lctl; /* 0x0044 */
+ __s16 icpua; /* 0x0046 */
+ __u32 ictl; /* 0x0048 */
+ __u32 eca; /* 0x004c */
+ __u8 icptcode; /* 0x0050 */
+ __u8 reserved51; /* 0x0051 */
+ __u16 ihcpu; /* 0x0052 */
+ __u8 reserved54[2]; /* 0x0054 */
+ __u16 ipa; /* 0x0056 */
+ __u32 ipb; /* 0x0058 */
+ __u32 scaoh; /* 0x005c */
+ __u8 reserved60; /* 0x0060 */
+ __u8 ecb; /* 0x0061 */
+ __u8 reserved62[2]; /* 0x0062 */
+ __u32 scaol; /* 0x0064 */
+ __u8 reserved68[4]; /* 0x0068 */
+ __u32 todpr; /* 0x006c */
+ __u8 reserved70[16]; /* 0x0070 */
+ __u64 gmsor; /* 0x0080 */
+ __u64 gmslm; /* 0x0088 */
+ psw_t gpsw; /* 0x0090 */
+ __u64 gg14; /* 0x00a0 */
+ __u64 gg15; /* 0x00a8 */
+ __u8 reservedb0[80]; /* 0x00b0 */
+ __u64 gcr[16]; /* 0x0100 */
+ __u64 gbea; /* 0x0180 */
+ __u8 reserved188[120]; /* 0x0188 */
+} __attribute__((packed));
+
+struct kvm_vcpu_stat {
+ u32 exit_userspace;
+};
+
+struct kvm_vcpu_arch {
+ struct sie_block *sie_block;
+ unsigned long guest_gprs[16];
+ s390_fp_regs host_fpregs;
+ unsigned int host_acrs[NUM_ACRS];
+ s390_fp_regs guest_fpregs;
+ unsigned int guest_acrs[NUM_ACRS];
+};
+
+struct kvm_vm_stat {
+ u32 remote_tlb_flush;
+};
+
+struct kvm_arch{
+ unsigned long guest_origin;
+ unsigned long guest_memsize;
+ struct sca_block *sca;
+ debug_info_t *dbf;
+};
+
+extern int sie64a(struct sie_block *, __u64 *);
+#endif
diff --git a/include/asm-s390/kvm_para.h b/include/asm-s390/kvm_para.h
new file mode 100644
index 0000000..e9bd3fb
--- /dev/null
+++ b/include/asm-s390/kvm_para.h
@@ -0,0 +1,30 @@
+/*
+ * asm-s390/kvm_para.h - definition for paravirtual devices on s390
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
+ */
+
+#ifndef __S390_KVM_PARA_H
+#define __S390_KVM_PARA_H
+
+/*
+ * No hypercalls for KVM on s390
+ */
+
+static inline int kvm_para_available(void)
+{
+ return 0;
+}
+
+static inline unsigned int kvm_arch_para_features(void)
+{
+ return 0;
+}
+
+#endif /* __S390_KVM_PARA_H */
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 3bd3828..2367ff0 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -205,6 +205,11 @@
__u64 vapic_addr;
};
+struct kvm_s390_psw {
+ __u64 mask;
+ __u64 addr;
+};
+
#define KVMIO 0xAE
/*
@@ -213,6 +218,8 @@
#define KVM_GET_API_VERSION _IO(KVMIO, 0x00)
#define KVM_CREATE_VM _IO(KVMIO, 0x01) /* returns a VM fd */
#define KVM_GET_MSR_INDEX_LIST _IOWR(KVMIO, 0x02, struct kvm_msr_list)
+
+#define KVM_S390_ENABLE_SIE _IO(KVMIO, 0x06)
/*
* Check if a kvm extension is available. Argument is extension number,
* return is 1 (yes) or 0 (no, sorry).
@@ -291,5 +298,13 @@
#define KVM_TPR_ACCESS_REPORTING _IOWR(KVMIO, 0x92, struct kvm_tpr_access_ctl)
/* Available with KVM_CAP_VAPIC */
#define KVM_SET_VAPIC_ADDR _IOW(KVMIO, 0x93, struct kvm_vapic_addr)
+/* store status for s390 */
+#define KVM_S390_STORE_STATUS_NOADDR (-1ul)
+#define KVM_S390_STORE_STATUS_PREFIXED (-2ul)
+#define KVM_S390_STORE_STATUS _IOW(KVMIO, 0x95, unsigned long)
+/* initial ipl psw for s390 */
+#define KVM_S390_SET_INITIAL_PSW _IOW(KVMIO, 0x96, struct kvm_s390_psw)
+/* initial reset for s390 */
+#define KVM_S390_INITIAL_RESET _IO(KVMIO, 0x97)
#endif