From: Michael Mueller <mimu@xxxxxxxxxxxxxxxxxx>
The patch introduces facilities and cpu_ids per virtual machine.
Different virtual machines may want to expose different facilities and
cpu ids to the guest, so let's make them per-vm instead of global.
Signed-off-by: Michael Mueller <mimu@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
arch/s390/include/asm/kvm_host.h | 21 +++++++++
arch/s390/kvm/gaccess.c | 4 +-
arch/s390/kvm/kvm-s390.c | 92 +++++++++++++++++++++++++---------------
arch/s390/kvm/kvm-s390.h | 13 ++++--
arch/s390/kvm/priv.c | 13 ++++--
5 files changed, 99 insertions(+), 44 deletions(-)
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 77ae014..79dc3b0 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -506,6 +506,26 @@ struct s390_io_adapter {
#define MAX_S390_IO_ADAPTERS ((MAX_ISC + 1) * 8)
#define MAX_S390_ADAPTER_MAPS 256
+/* maximum size of facilities and facility mask is 2k bytes */
+#define S390_ARCH_FAC_LIST_SIZE_BYTE (1<<11)
+#define S390_ARCH_FAC_LIST_SIZE_U64 \
+ (S390_ARCH_FAC_LIST_SIZE_BYTE / sizeof(u64))
+#define S390_ARCH_FAC_MASK_SIZE_BYTE S390_ARCH_FAC_LIST_SIZE_BYTE
+#define S390_ARCH_FAC_MASK_SIZE_U64 \
+ (S390_ARCH_FAC_MASK_SIZE_BYTE / sizeof(u64))
+
+struct s390_model_fac {
+ /* facilities used in SIE context */
+ __u64 sie[S390_ARCH_FAC_LIST_SIZE_U64];
+ /* subset enabled by kvm */
+ __u64 kvm[S390_ARCH_FAC_LIST_SIZE_U64];
+};
+
+struct kvm_s390_cpu_model {
+ struct s390_model_fac *fac;
+ struct cpuid cpu_id;
+};
+
struct kvm_s390_crypto {
struct kvm_s390_crypto_cb *crycb;
__u32 crycbd;
@@ -536,6 +556,7 @@ struct kvm_arch{
int ipte_lock_count;
struct mutex ipte_mutex;
spinlock_t start_stop_lock;
+ struct kvm_s390_cpu_model model;
struct kvm_s390_crypto crypto;
u64 epoch;
};
diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
index 8a1be90..267523c 100644
--- a/arch/s390/kvm/gaccess.c
+++ b/arch/s390/kvm/gaccess.c
@@ -357,8 +357,8 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva,
union asce asce;
ctlreg0.val = vcpu->arch.sie_block->gcr[0];
- edat1 = ctlreg0.edat && test_vfacility(8);
- edat2 = edat1 && test_vfacility(78);
+ edat1 = ctlreg0.edat && test_kvm_facility(vcpu->kvm, 8);
+ edat2 = edat1 && test_kvm_facility(vcpu->kvm, 78);
asce.val = get_vcpu_asce(vcpu);
if (asce.r)
goto real_address;
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index deac473..8c538a1 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -30,7 +30,6 @@
#include <asm/pgtable.h>
#include <asm/nmi.h>
#include <asm/switch_to.h>
-#include <asm/facility.h>
#include <asm/sclp.h>
#include "kvm-s390.h"
#include "gaccess.h"
@@ -100,15 +99,20 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ NULL }
};
-unsigned long *vfacilities;
-static struct gmap_notifier gmap_notifier;
+/* upper facilities limit for kvm */
+unsigned long kvm_s390_fac_list_mask[] = {
+ 0xff82fffbf4fc2000UL,
+ 0x005c000000000000UL,
+};
-/* test availability of vfacility */
-int test_vfacility(unsigned long nr)
+unsigned long kvm_s390_fac_list_mask_size(void)
{
- return __test_facility(nr, (void *) vfacilities);
+ BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) > S390_ARCH_FAC_MASK_SIZE_U64);
+ return ARRAY_SIZE(kvm_s390_fac_list_mask);
}
+static struct gmap_notifier gmap_notifier;
+
/* Section: not file related */
int kvm_arch_hardware_enable(void)
{
@@ -351,7 +355,7 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
struct kvm_vcpu *vcpu;
int i;
- if (!test_vfacility(76))
+ if (!test_kvm_facility(kvm, 76))
return -EINVAL;
mutex_lock(&kvm->lock);
@@ -700,9 +704,15 @@ static void kvm_s390_set_crycb_format(struct kvm *kvm)
kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
}
+static void kvm_s390_get_cpu_id(struct cpuid *cpu_id)
+{
+ get_cpu_id(cpu_id);
+ cpu_id->version = 0xff;
+}
+
static int kvm_s390_crypto_init(struct kvm *kvm)
{
- if (!test_vfacility(76))
+ if (!test_kvm_facility(kvm, 76))
return 0;
kvm->arch.crypto.crycb = kzalloc(sizeof(*kvm->arch.crypto.crycb),
@@ -721,7 +731,7 @@ static int kvm_s390_crypto_init(struct kvm *kvm)
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
- int rc;
+ int i, rc;
char debug_name[16];
static unsigned long sca_offset;
@@ -756,6 +766,34 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
if (!kvm->arch.dbf)
goto out_nodbf;
+ /*
+ * The architectural maximum amount of facilities is 16 kbit. To store
+ * this amount, 2 kbyte of memory is required. Thus we need a full
+ * page to hold the active copy (arch.model.fac->sie) and the current
+ * facilities set (arch.model.fac->kvm). Its address size has to be
+ * 31 bits and word aligned.
+ */
+ kvm->arch.model.fac =
+ (struct s390_model_fac *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
+ if (!kvm->arch.model.fac)
+ goto out_nofac;
+
+ memcpy(kvm->arch.model.fac->kvm, S390_lowcore.stfle_fac_list,
+ S390_ARCH_FAC_LIST_SIZE_U64);
+
+ /*
+ * Apply the kvm facility mask to limit the kvm supported/tolerated
+ * facility list.
+ */
+ for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) {
+ if (i < kvm_s390_fac_list_mask_size())
+ kvm->arch.model.fac->kvm[i] &= kvm_s390_fac_list_mask[i];
+ else
+ kvm->arch.model.fac->kvm[i] = 0UL;
+ }
+
+ kvm_s390_get_cpu_id(&kvm->arch.model.cpu_id);
+
if (kvm_s390_crypto_init(kvm) < 0)
goto out_crypto;
@@ -787,6 +825,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
out_nogmap:
kfree(kvm->arch.crypto.crycb);
out_crypto:
+ free_page((unsigned long)kvm->arch.model.fac);
+out_nofac:
debug_unregister(kvm->arch.dbf);
out_nodbf:
free_page((unsigned long)(kvm->arch.sca));
@@ -839,6 +879,7 @@ static void kvm_free_vcpus(struct kvm *kvm)
void kvm_arch_destroy_vm(struct kvm *kvm)
{
kvm_free_vcpus(kvm);
+ free_page((unsigned long)kvm->arch.model.fac);
free_page((unsigned long)(kvm->arch.sca));
debug_unregister(kvm->arch.dbf);
kfree(kvm->arch.crypto.crycb);
@@ -934,7 +975,7 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
{
- if (!test_vfacility(76))
+ if (!test_kvm_facility(vcpu->kvm, 76))
return;
vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
@@ -973,7 +1014,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
CPUSTAT_STOPPED |
CPUSTAT_GED);
vcpu->arch.sie_block->ecb = 6;
- if (test_vfacility(50) && test_vfacility(73))
+ if (test_kvm_facility(vcpu->kvm, 50) && test_kvm_facility(vcpu->kvm, 73))
vcpu->arch.sie_block->ecb |= 0x10;
vcpu->arch.sie_block->ecb2 = 8;
@@ -982,7 +1023,6 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
vcpu->arch.sie_block->eca |= 1;
if (sclp_has_sigpif())
vcpu->arch.sie_block->eca |= 0x10000000U;
- vcpu->arch.sie_block->fac = (int) (long) vfacilities;
vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE |
ICTL_TPROT;
@@ -993,8 +1033,10 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
}
hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
- get_cpu_id(&vcpu->arch.cpu_id);
- vcpu->arch.cpu_id.version = 0xff;
+
+ vcpu->arch.cpu_id = vcpu->kvm->arch.model.cpu_id;
+ memcpy(vcpu->kvm->arch.model.fac->sie, vcpu->kvm->arch.model.fac->kvm,
+ S390_ARCH_FAC_LIST_SIZE_BYTE);
kvm_s390_vcpu_crypto_setup(vcpu);
@@ -1038,6 +1080,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn);
}
+ vcpu->arch.sie_block->fac = (int) (long) kvm->arch.model.fac->sie;
spin_lock_init(&vcpu->arch.local_int.lock);
vcpu->arch.local_int.float_int = &kvm->arch.float_int;
@@ -2103,30 +2146,11 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
static int __init kvm_s390_init(void)
{
- int ret;
- ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
- if (ret)
- return ret;
-
- /*
- * guests can ask for up to 255+1 double words, we need a full page
- * to hold the maximum amount of facilities. On the other hand, we
- * only set facilities that are known to work in KVM.
- */
- vfacilities = (unsigned long *) get_zeroed_page(GFP_KERNEL|GFP_DMA);
- if (!vfacilities) {
- kvm_exit();
- return -ENOMEM;
- }
- memcpy(vfacilities, S390_lowcore.stfle_fac_list, 16);
- vfacilities[0] &= 0xff82fffbf4fc2000UL;
- vfacilities[1] &= 0x005c000000000000UL;
- return 0;
+ return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
}
static void __exit kvm_s390_exit(void)
{
- free_page((unsigned long) vfacilities);
kvm_exit();
}
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
index c22dce8..985c211 100644
--- a/arch/s390/kvm/kvm-s390.h
+++ b/arch/s390/kvm/kvm-s390.h
@@ -18,12 +18,10 @@
#include <linux/hrtimer.h>
#include <linux/kvm.h>
#include <linux/kvm_host.h>
+#include <asm/facility.h>
typedef int (*intercept_handler_t)(struct kvm_vcpu *vcpu);
-/* declare vfacilities extern */
-extern unsigned long *vfacilities;
-
/* Transactional Memory Execution related macros */
#define IS_TE_ENABLED(vcpu) ((vcpu->arch.sie_block->ecb & 0x10))
#define TDB_FORMAT1 1
@@ -127,6 +125,12 @@ static inline void kvm_s390_set_psw_cc(struct kvm_vcpu *vcpu, unsigned long cc)
vcpu->arch.sie_block->gpsw.mask |= cc << 44;
}
+/* test availability of facility in a kvm intance */
+static inline int test_kvm_facility(struct kvm *kvm, unsigned long nr)
+{
+ return __test_facility(nr, kvm->arch.model.fac->kvm);
+}
+
/* are cpu states controlled by user space */
static inline int kvm_s390_user_cpu_state_ctrl(struct kvm *kvm)
{
@@ -183,7 +187,8 @@ int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);
void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);
/* is cmma enabled */
bool kvm_s390_cmma_enabled(struct kvm *kvm);
-int test_vfacility(unsigned long nr);
+unsigned long kvm_s390_fac_list_mask_size(void);
+extern unsigned long kvm_s390_fac_list_mask[];
/* implemented in diag.c */
int kvm_s390_handle_diag(struct kvm_vcpu *vcpu);
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 1be578d..bdd9b5b 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -337,19 +337,24 @@ static int handle_io_inst(struct kvm_vcpu *vcpu)
static int handle_stfl(struct kvm_vcpu *vcpu)
{
int rc;
+ unsigned int fac;
vcpu->stat.instruction_stfl++;
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
+ /*
+ * We need to shift the lower 32 facility bits (bit 0-31) from a u64
+ * into a u32 memory representation. They will remain bits 0-31.
+ */
+ fac = *vcpu->kvm->arch.model.fac->sie >> 32;
rc = write_guest_lc(vcpu, offsetof(struct _lowcore, stfl_fac_list),
- vfacilities, 4);
+ &fac, sizeof(fac));
if (rc)
return rc;
- VCPU_EVENT(vcpu, 5, "store facility list value %x",
- *(unsigned int *) vfacilities);
- trace_kvm_s390_handle_stfl(vcpu, *(unsigned int *) vfacilities);
+ VCPU_EVENT(vcpu, 5, "store facility list value %x", fac);
+ trace_kvm_s390_handle_stfl(vcpu, fac);
return 0;
}
--
1.9.3
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