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KVM: s390: Cleanups for 4.18

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- cleanups for nested, clock handling, crypto, storage keys and
 control register bits
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Merge tag 'kvm-s390-next-4.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

KVM: s390: Cleanups for 4.18

- cleanups for nested, clock handling, crypto, storage keys and
control register bits
This commit is contained in:
Paolo Bonzini 2018-06-01 19:17:41 +02:00
commit d7a8bea363
13 changed files with 98 additions and 65 deletions
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12
arch/s390/include/asm/ctl_reg.h
View File

@ -10,8 +10,20 @@
#include <linux/const.h>
#define CR0_CLOCK_COMPARATOR_SIGN _BITUL(63 - 10)
#define CR0_EMERGENCY_SIGNAL_SUBMASK _BITUL(63 - 49)
#define CR0_EXTERNAL_CALL_SUBMASK _BITUL(63 - 50)
#define CR0_CLOCK_COMPARATOR_SUBMASK _BITUL(63 - 52)
#define CR0_CPU_TIMER_SUBMASK _BITUL(63 - 53)
#define CR0_SERVICE_SIGNAL_SUBMASK _BITUL(63 - 54)
#define CR0_UNUSED_56 _BITUL(63 - 56)
#define CR0_INTERRUPT_KEY_SUBMASK _BITUL(63 - 57)
#define CR0_MEASUREMENT_ALERT_SUBMASK _BITUL(63 - 58)
#define CR2_GUARDED_STORAGE _BITUL(63 - 59)
#define CR14_UNUSED_32 _BITUL(63 - 32)
#define CR14_UNUSED_33 _BITUL(63 - 33)
#define CR14_CHANNEL_REPORT_SUBMASK _BITUL(63 - 35)
#define CR14_RECOVERY_SUBMASK _BITUL(63 - 36)
#define CR14_DEGRADATION_SUBMASK _BITUL(63 - 37)

1
arch/s390/include/asm/kvm_host.h
View File

@ -812,6 +812,7 @@ struct kvm_arch{
int use_irqchip;
int use_cmma;
int use_pfmfi;
int use_skf;
int user_cpu_state_ctrl;
int user_sigp;
int user_stsi;

2
arch/s390/include/asm/mmu.h
View File

@ -21,7 +21,7 @@ typedef struct {
/* The mmu context uses extended page tables. */
unsigned int has_pgste:1;
/* The mmu context uses storage keys. */
unsigned int use_skey:1;
unsigned int uses_skeys:1;
/* The mmu context uses CMM. */
unsigned int uses_cmm:1;
} mm_context_t;

2
arch/s390/include/asm/mmu_context.h
View File

@ -30,7 +30,7 @@ static inline int init_new_context(struct task_struct *tsk,
test_thread_flag(TIF_PGSTE) ||
(current->mm && current->mm->context.alloc_pgste);
mm->context.has_pgste = 0;
mm->context.use_skey = 0;
mm->context.uses_skeys = 0;
mm->context.uses_cmm = 0;
#endif
switch (mm->context.asce_limit) {

4
arch/s390/include/asm/pgtable.h
View File

@ -507,10 +507,10 @@ static inline int mm_alloc_pgste(struct mm_struct *mm)
* faults should no longer be backed by zero pages
*/
#define mm_forbids_zeropage mm_has_pgste
static inline int mm_use_skey(struct mm_struct *mm)
static inline int mm_uses_skeys(struct mm_struct *mm)
{
#ifdef CONFIG_PGSTE
if (mm->context.use_skey)
if (mm->context.uses_skeys)
return 1;
#endif
return 0;

2
arch/s390/kvm/guestdbg.c
View File

@ -153,7 +153,7 @@ void kvm_s390_patch_guest_per_regs(struct kvm_vcpu *vcpu)
if (guestdbg_sstep_enabled(vcpu)) {
/* disable timer (clock-comparator) interrupts */
vcpu->arch.sie_block->gcr[0] &= ~0x800ul;
vcpu->arch.sie_block->gcr[0] &= ~CR0_CLOCK_COMPARATOR_SUBMASK;
vcpu->arch.sie_block->gcr[9] |= PER_EVENT_IFETCH;
vcpu->arch.sie_block->gcr[10] = 0;
vcpu->arch.sie_block->gcr[11] = -1UL;

20
arch/s390/kvm/interrupt.c
View File

@ -159,7 +159,7 @@ static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
{
if (psw_extint_disabled(vcpu) ||
!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
!(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
return 0;
if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
/* No timer interrupts when single stepping */
@ -172,7 +172,7 @@ static int ckc_irq_pending(struct kvm_vcpu *vcpu)
const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
const u64 ckc = vcpu->arch.sie_block->ckc;
if (vcpu->arch.sie_block->gcr[0] & 0x0020000000000000ul) {
if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
if ((s64)ckc >= (s64)now)
return 0;
} else if (ckc >= now) {
@ -184,7 +184,7 @@ static int ckc_irq_pending(struct kvm_vcpu *vcpu)
static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
{
return !psw_extint_disabled(vcpu) &&
(vcpu->arch.sie_block->gcr[0] & 0x400ul);
(vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK);
}
static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
@ -285,15 +285,15 @@ static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
active_mask &= ~IRQ_PEND_IO_MASK;
else
active_mask = disable_iscs(vcpu, active_mask);
if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
if (!(vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
__clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
if (!(vcpu->arch.sie_block->gcr[0] & CR0_EMERGENCY_SIGNAL_SUBMASK))
__clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
if (!(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
__clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
if (!(vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK))
__clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
__clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
if (psw_mchk_disabled(vcpu))
active_mask &= ~IRQ_PEND_MCHK_MASK;
@ -1042,7 +1042,7 @@ int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
/* external call pending and deliverable */
if (kvm_s390_ext_call_pending(vcpu) &&
!psw_extint_disabled(vcpu) &&
(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
(vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
return 1;
if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
@ -1062,7 +1062,7 @@ static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
u64 cputm, sltime = 0;
if (ckc_interrupts_enabled(vcpu)) {
if (vcpu->arch.sie_block->gcr[0] & 0x0020000000000000ul) {
if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
if ((s64)now < (s64)ckc)
sltime = tod_to_ns((s64)ckc - (s64)now);
} else if (now < ckc) {

59
arch/s390/kvm/kvm-s390.c
View File

@ -791,11 +791,21 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm)
{
struct kvm_vcpu *vcpu;
int i;
kvm_s390_vcpu_block_all(kvm);
kvm_for_each_vcpu(i, vcpu, kvm)
kvm_s390_vcpu_crypto_setup(vcpu);
kvm_s390_vcpu_unblock_all(kvm);
}
static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
{
if (!test_kvm_facility(kvm, 76))
return -EINVAL;
@ -832,10 +842,7 @@ static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
return -ENXIO;
}
kvm_for_each_vcpu(i, vcpu, kvm) {
kvm_s390_vcpu_crypto_setup(vcpu);
exit_sie(vcpu);
}
kvm_s390_vcpu_crypto_reset_all(kvm);
mutex_unlock(&kvm->lock);
return 0;
}
@ -1033,8 +1040,8 @@ static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
return ret;
}
static void kvm_s390_get_tod_clock_ext(struct kvm *kvm,
struct kvm_s390_vm_tod_clock *gtod)
static void kvm_s390_get_tod_clock(struct kvm *kvm,
struct kvm_s390_vm_tod_clock *gtod)
{
struct kvm_s390_tod_clock_ext htod;
@ -1043,10 +1050,12 @@ static void kvm_s390_get_tod_clock_ext(struct kvm *kvm,
get_tod_clock_ext((char *)&htod);
gtod->tod = htod.tod + kvm->arch.epoch;
gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;
if (gtod->tod < htod.tod)
gtod->epoch_idx += 1;
gtod->epoch_idx = 0;
if (test_kvm_facility(kvm, 139)) {
gtod->epoch_idx = htod.epoch_idx + kvm->arch.epdx;
if (gtod->tod < htod.tod)
gtod->epoch_idx += 1;
}
preempt_enable();
}
@ -1056,12 +1065,7 @@ static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
struct kvm_s390_vm_tod_clock gtod;
memset(&gtod, 0, sizeof(gtod));
if (test_kvm_facility(kvm, 139))
kvm_s390_get_tod_clock_ext(kvm, &gtod);
else
gtod.tod = kvm_s390_get_tod_clock_fast(kvm);
kvm_s390_get_tod_clock(kvm, &gtod);
if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
return -EFAULT;
@ -1493,7 +1497,7 @@ static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
return -EINVAL;
/* Is this guest using storage keys? */
if (!mm_use_skey(current->mm))
if (!mm_uses_skeys(current->mm))
return KVM_S390_GET_SKEYS_NONE;
/* Enforce sane limit on memory allocation */
@ -1982,10 +1986,10 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
rc = -ENOMEM;
kvm->arch.use_esca = 0; /* start with basic SCA */
if (!sclp.has_64bscao)
alloc_flags |= GFP_DMA;
rwlock_init(&kvm->arch.sca_lock);
/* start with basic SCA */
kvm->arch.sca = (struct bsca_block *) get_zeroed_page(alloc_flags);
if (!kvm->arch.sca)
goto out_err;
@ -2036,8 +2040,6 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm_s390_crypto_init(kvm);
mutex_init(&kvm->arch.float_int.ais_lock);
kvm->arch.float_int.simm = 0;
kvm->arch.float_int.nimm = 0;
spin_lock_init(&kvm->arch.float_int.lock);
for (i = 0; i < FIRQ_LIST_COUNT; i++)
INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
@ -2063,11 +2065,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm->arch.gmap->pfault_enabled = 0;
}
kvm->arch.css_support = 0;
kvm->arch.use_irqchip = 0;
kvm->arch.use_pfmfi = sclp.has_pfmfi;
kvm->arch.epoch = 0;
kvm->arch.use_skf = sclp.has_skey;
spin_lock_init(&kvm->arch.start_stop_lock);
kvm_s390_vsie_init(kvm);
kvm_s390_gisa_init(kvm);
@ -2433,8 +2432,12 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
vcpu->arch.sie_block->ckc = 0UL;
vcpu->arch.sie_block->todpr = 0;
memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
vcpu->arch.sie_block->gcr[0] = 0xE0UL;
vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
vcpu->arch.sie_block->gcr[0] = CR0_UNUSED_56 |
CR0_INTERRUPT_KEY_SUBMASK |
CR0_MEASUREMENT_ALERT_SUBMASK;
vcpu->arch.sie_block->gcr[14] = CR14_UNUSED_32 |
CR14_UNUSED_33 |
CR14_EXTERNAL_DAMAGE_SUBMASK;
/* make sure the new fpc will be lazily loaded */
save_fpu_regs();
current->thread.fpu.fpc = 0;
@ -3192,7 +3195,7 @@ static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
return 0;
if (kvm_s390_vcpu_has_irq(vcpu, 0))
return 0;
if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
return 0;
if (!vcpu->arch.gmap->pfault_enabled)
return 0;

13
arch/s390/kvm/kvm-s390.h
View File

@ -410,4 +410,17 @@ static inline int kvm_s390_use_sca_entries(void)
}
void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
struct mcck_volatile_info *mcck_info);
/**
* kvm_s390_vcpu_crypto_reset_all
*
* Reset the crypto attributes for each vcpu. This can be done while the vcpus
* are running as each vcpu will be removed from SIE before resetting the crypt
* attributes and restored to SIE afterward.
*
* Note: The kvm->lock must be held while calling this function
*
* @kvm: the KVM guest
*/
void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm);
#endif

28
arch/s390/kvm/priv.c
View File

@ -205,24 +205,28 @@ static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
int kvm_s390_skey_check_enable(struct kvm_vcpu *vcpu)
{
int rc = 0;
int rc;
struct kvm_s390_sie_block *sie_block = vcpu->arch.sie_block;
trace_kvm_s390_skey_related_inst(vcpu);
if (!(sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)) &&
/* Already enabled? */
if (vcpu->kvm->arch.use_skf &&
!(sie_block->ictl & (ICTL_ISKE | ICTL_SSKE | ICTL_RRBE)) &&
!kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
return rc;
return 0;
rc = s390_enable_skey();
VCPU_EVENT(vcpu, 3, "enabling storage keys for guest: %d", rc);
if (!rc) {
if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
else
sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE |
ICTL_RRBE);
}
return rc;
if (rc)
return rc;
if (kvm_s390_test_cpuflags(vcpu, CPUSTAT_KSS))
kvm_s390_clear_cpuflags(vcpu, CPUSTAT_KSS);
if (!vcpu->kvm->arch.use_skf)
sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
else
sie_block->ictl &= ~(ICTL_ISKE | ICTL_SSKE | ICTL_RRBE);
return 0;
}
static int try_handle_skey(struct kvm_vcpu *vcpu)
@ -232,7 +236,7 @@ static int try_handle_skey(struct kvm_vcpu *vcpu)
rc = kvm_s390_skey_check_enable(vcpu);
if (rc)
return rc;
if (sclp.has_skey) {
if (vcpu->kvm->arch.use_skf) {
/* with storage-key facility, SIE interprets it for us */
kvm_s390_retry_instr(vcpu);
VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");

10
arch/s390/kvm/vsie.c
View File

@ -557,7 +557,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO))
gpa |= (u64) READ_ONCE(scb_o->scaoh) << 32;
if (gpa) {
if (!(gpa & ~0x1fffUL))
if (gpa < 2 * PAGE_SIZE)
rc = set_validity_icpt(scb_s, 0x0038U);
else if ((gpa & ~0x1fffUL) == kvm_s390_get_prefix(vcpu))
rc = set_validity_icpt(scb_s, 0x0011U);
@ -578,7 +578,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
gpa = READ_ONCE(scb_o->itdba) & ~0xffUL;
if (gpa && (scb_s->ecb & ECB_TE)) {
if (!(gpa & ~0x1fffU)) {
if (gpa < 2 * PAGE_SIZE) {
rc = set_validity_icpt(scb_s, 0x0080U);
goto unpin;
}
@ -594,7 +594,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
gpa = READ_ONCE(scb_o->gvrd) & ~0x1ffUL;
if (gpa && (scb_s->eca & ECA_VX) && !(scb_s->ecd & ECD_HOSTREGMGMT)) {
if (!(gpa & ~0x1fffUL)) {
if (gpa < 2 * PAGE_SIZE) {
rc = set_validity_icpt(scb_s, 0x1310U);
goto unpin;
}
@ -613,7 +613,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
gpa = READ_ONCE(scb_o->riccbd) & ~0x3fUL;
if (gpa && (scb_s->ecb3 & ECB3_RI)) {
if (!(gpa & ~0x1fffUL)) {
if (gpa < 2 * PAGE_SIZE) {
rc = set_validity_icpt(scb_s, 0x0043U);
goto unpin;
}
@ -632,7 +632,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
gpa = READ_ONCE(scb_o->sdnxo) & ~0xfUL;
sdnxc = READ_ONCE(scb_o->sdnxo) & 0xfUL;
if (!gpa || !(gpa & ~0x1fffUL)) {
if (!gpa || gpa < 2 * PAGE_SIZE) {
rc = set_validity_icpt(scb_s, 0x10b0U);
goto unpin;
}

6
arch/s390/mm/gmap.c
View File

@ -2184,14 +2184,14 @@ int s390_enable_skey(void)
int rc = 0;
down_write(&mm->mmap_sem);
if (mm_use_skey(mm))
if (mm_uses_skeys(mm))
goto out_up;
mm->context.use_skey = 1;
mm->context.uses_skeys = 1;
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (ksm_madvise(vma, vma->vm_start, vma->vm_end,
MADV_UNMERGEABLE, &vma->vm_flags)) {
mm->context.use_skey = 0;
mm->context.uses_skeys = 0;
rc = -ENOMEM;
goto out_up;
}

4
arch/s390/mm/pgtable.c
View File

@ -158,7 +158,7 @@ static inline pgste_t pgste_update_all(pte_t pte, pgste_t pgste,
#ifdef CONFIG_PGSTE
unsigned long address, bits, skey;
if (!mm_use_skey(mm) || pte_val(pte) & _PAGE_INVALID)
if (!mm_uses_skeys(mm) || pte_val(pte) & _PAGE_INVALID)
return pgste;
address = pte_val(pte) & PAGE_MASK;
skey = (unsigned long) page_get_storage_key(address);
@ -180,7 +180,7 @@ static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry,
unsigned long address;
unsigned long nkey;
if (!mm_use_skey(mm) || pte_val(entry) & _PAGE_INVALID)
if (!mm_uses_skeys(mm) || pte_val(entry) & _PAGE_INVALID)
return;
VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID));
address = pte_val(entry) & PAGE_MASK;