diff options
Diffstat (limited to 'arch/s390/kvm/priv.c')
| -rw-r--r-- | arch/s390/kvm/priv.c | 111 |
1 files changed, 102 insertions, 9 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index c03106c428cf..8a1dac793d6b 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -24,6 +24,7 @@ #include <asm/ebcdic.h> #include <asm/sysinfo.h> #include <asm/pgtable.h> +#include <asm/page-states.h> #include <asm/pgalloc.h> #include <asm/gmap.h> #include <asm/io.h> @@ -361,7 +362,7 @@ static int handle_sske(struct kvm_vcpu *vcpu) } } if (m3 & SSKE_MB) { - if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT) + if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) vcpu->run->s.regs.gprs[reg2] &= ~PAGE_MASK; else vcpu->run->s.regs.gprs[reg2] &= ~0xfffff000UL; @@ -374,7 +375,7 @@ static int handle_sske(struct kvm_vcpu *vcpu) static int handle_ipte_interlock(struct kvm_vcpu *vcpu) { vcpu->stat.instruction_ipte_interlock++; - if (psw_bits(vcpu->arch.sie_block->gpsw).p) + if (psw_bits(vcpu->arch.sie_block->gpsw).pstate) return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); wait_event(vcpu->kvm->arch.ipte_wq, !ipte_lock_held(vcpu)); kvm_s390_retry_instr(vcpu); @@ -901,7 +902,7 @@ static int handle_pfmf(struct kvm_vcpu *vcpu) /* only support 2G frame size if EDAT2 is available and we are not in 24-bit addressing mode */ if (!test_kvm_facility(vcpu->kvm, 78) || - psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_24BIT) + psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_24BIT) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); end = (start + (1UL << 31)) & ~((1UL << 31) - 1); break; @@ -938,7 +939,7 @@ static int handle_pfmf(struct kvm_vcpu *vcpu) start += PAGE_SIZE; } if (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) { - if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_AMODE_64BIT) { + if (psw_bits(vcpu->arch.sie_block->gpsw).eaba == PSW_BITS_AMODE_64BIT) { vcpu->run->s.regs.gprs[reg2] = end; } else { vcpu->run->s.regs.gprs[reg2] &= ~0xffffffffUL; @@ -949,13 +950,72 @@ static int handle_pfmf(struct kvm_vcpu *vcpu) return 0; } +static inline int do_essa(struct kvm_vcpu *vcpu, const int orc) +{ + struct kvm_s390_migration_state *ms = vcpu->kvm->arch.migration_state; + int r1, r2, nappended, entries; + unsigned long gfn, hva, res, pgstev, ptev; + unsigned long *cbrlo; + + /* + * We don't need to set SD.FPF.SK to 1 here, because if we have a + * machine check here we either handle it or crash + */ + + kvm_s390_get_regs_rre(vcpu, &r1, &r2); + gfn = vcpu->run->s.regs.gprs[r2] >> PAGE_SHIFT; + hva = gfn_to_hva(vcpu->kvm, gfn); + entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; + + if (kvm_is_error_hva(hva)) + return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); + + nappended = pgste_perform_essa(vcpu->kvm->mm, hva, orc, &ptev, &pgstev); + if (nappended < 0) { + res = orc ? 0x10 : 0; + vcpu->run->s.regs.gprs[r1] = res; /* Exception Indication */ + return 0; + } + res = (pgstev & _PGSTE_GPS_USAGE_MASK) >> 22; + /* + * Set the block-content state part of the result. 0 means resident, so + * nothing to do if the page is valid. 2 is for preserved pages + * (non-present and non-zero), and 3 for zero pages (non-present and + * zero). + */ + if (ptev & _PAGE_INVALID) { + res |= 2; + if (pgstev & _PGSTE_GPS_ZERO) + res |= 1; + } + vcpu->run->s.regs.gprs[r1] = res; + /* + * It is possible that all the normal 511 slots were full, in which case + * we will now write in the 512th slot, which is reserved for host use. + * In both cases we let the normal essa handling code process all the + * slots, including the reserved one, if needed. + */ + if (nappended > 0) { + cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo & PAGE_MASK); + cbrlo[entries] = gfn << PAGE_SHIFT; + } + + if (orc) { + /* increment only if we are really flipping the bit to 1 */ + if (!test_and_set_bit(gfn, ms->pgste_bitmap)) + atomic64_inc(&ms->dirty_pages); + } + + return nappended; +} + static int handle_essa(struct kvm_vcpu *vcpu) { /* entries expected to be 1FF */ int entries = (vcpu->arch.sie_block->cbrlo & ~PAGE_MASK) >> 3; unsigned long *cbrlo; struct gmap *gmap; - int i; + int i, orc; VCPU_EVENT(vcpu, 4, "ESSA: release %d pages", entries); gmap = vcpu->arch.gmap; @@ -965,12 +1025,45 @@ static int handle_essa(struct kvm_vcpu *vcpu) if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE) return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP); - - if (((vcpu->arch.sie_block->ipb & 0xf0000000) >> 28) > 6) + /* Check for invalid operation request code */ + orc = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28; + if (orc > ESSA_MAX) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - /* Retry the ESSA instruction */ - kvm_s390_retry_instr(vcpu); + if (likely(!vcpu->kvm->arch.migration_state)) { + /* + * CMMA is enabled in the KVM settings, but is disabled in + * the SIE block and in the mm_context, and we are not doing + * a migration. Enable CMMA in the mm_context. + * Since we need to take a write lock to write to the context + * to avoid races with storage keys handling, we check if the + * value really needs to be written to; if the value is + * already correct, we do nothing and avoid the lock. + */ + if (vcpu->kvm->mm->context.use_cmma == 0) { + down_write(&vcpu->kvm->mm->mmap_sem); + vcpu->kvm->mm->context.use_cmma = 1; + up_write(&vcpu->kvm->mm->mmap_sem); + } + /* + * If we are here, we are supposed to have CMMA enabled in + * the SIE block. Enabling CMMA works on a per-CPU basis, + * while the context use_cmma flag is per process. + * It's possible that the context flag is enabled and the + * SIE flag is not, so we set the flag always; if it was + * already set, nothing changes, otherwise we enable it + * on this CPU too. + */ + vcpu->arch.sie_block->ecb2 |= ECB2_CMMA; + /* Retry the ESSA instruction */ + kvm_s390_retry_instr(vcpu); + } else { + /* Account for the possible extra cbrl entry */ + i = do_essa(vcpu, orc); + if (i < 0) + return i; + entries += i; + } vcpu->arch.sie_block->cbrlo &= PAGE_MASK; /* reset nceo */ cbrlo = phys_to_virt(vcpu->arch.sie_block->cbrlo); down_read(&gmap->mm->mmap_sem); |