From c611990844c28c61ca4b35ff69d3a2ae95ccd486 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Thu, 5 Dec 2019 07:40:43 -0500 Subject: KVM: s390: ENOTSUPP -> EOPNOTSUPP fixups There is no ENOTSUPP for userspace. Reported-by: Julian Wiedmann Fixes: 519783935451 ("KVM: s390: introduce ais mode modify function") Fixes: 2c1a48f2e5ed ("KVM: S390: add new group for flic") Reviewed-by: Cornelia Huck Reviewed-by: Thomas Huth Signed-off-by: Christian Borntraeger --- arch/s390/kvm/interrupt.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/s390') diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 165dea4c7f19..c06c89d370a7 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -2190,7 +2190,7 @@ static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr) return -EINVAL; if (!test_kvm_facility(kvm, 72)) - return -ENOTSUPP; + return -EOPNOTSUPP; mutex_lock(&fi->ais_lock); ais.simm = fi->simm; @@ -2499,7 +2499,7 @@ static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr) int ret = 0; if (!test_kvm_facility(kvm, 72)) - return -ENOTSUPP; + return -EOPNOTSUPP; if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req))) return -EFAULT; @@ -2579,7 +2579,7 @@ static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr) struct kvm_s390_ais_all ais; if (!test_kvm_facility(kvm, 72)) - return -ENOTSUPP; + return -EOPNOTSUPP; if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais))) return -EFAULT; -- cgit v1.2.3-59-g8ed1b From 55680890ea78be0df5e1384989f1be835043c084 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Fri, 31 Jan 2020 05:02:00 -0500 Subject: KVM: s390: do not clobber registers during guest reset/store status The initial CPU reset clobbers the userspace fpc and the store status ioctl clobbers the guest acrs + fpr. As these calls are only done via ioctl (and not via vcpu_run), no CPU context is loaded, so we can (and must) act directly on the sync regs, not on the thread context. Cc: stable@kernel.org Fixes: e1788bb995be ("KVM: s390: handle floating point registers in the run ioctl not in vcpu_put/load") Fixes: 31d8b8d41a7e ("KVM: s390: handle access registers in the run ioctl not in vcpu_put/load") Signed-off-by: Christian Borntraeger Reviewed-by: David Hildenbrand Reviewed-by: Cornelia Huck Signed-off-by: Janosch Frank Link: https://lore.kernel.org/r/20200131100205.74720-2-frankja@linux.ibm.com Signed-off-by: Christian Borntraeger --- arch/s390/kvm/kvm-s390.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'arch/s390') diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index d9e6bf3d54f0..876802894b35 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -2860,9 +2860,7 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) 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; + vcpu->run->s.regs.fpc = 0; vcpu->arch.sie_block->gbea = 1; vcpu->arch.sie_block->pp = 0; vcpu->arch.sie_block->fpf &= ~FPF_BPBC; @@ -4351,7 +4349,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp, switch (ioctl) { case KVM_S390_STORE_STATUS: idx = srcu_read_lock(&vcpu->kvm->srcu); - r = kvm_s390_vcpu_store_status(vcpu, arg); + r = kvm_s390_store_status_unloaded(vcpu, arg); srcu_read_unlock(&vcpu->kvm->srcu, idx); break; case KVM_S390_SET_INITIAL_PSW: { -- cgit v1.2.3-59-g8ed1b From cca00ebb8ad3b3a5eb6e60b1ac7e9211f66af477 Mon Sep 17 00:00:00 2001 From: Janosch Frank Date: Fri, 31 Jan 2020 05:02:01 -0500 Subject: KVM: s390: Cleanup initial cpu reset The code seems to be quite old and uses lots of unneeded spaces for alignment, which doesn't really help with readability. Let's: * Get rid of the extra spaces * Remove the ULs as they are not needed on 0s * Define constants for the CR 0 and 14 initial values * Use the sizeof of the gcr array to memset it to 0 Signed-off-by: Janosch Frank Reviewed-by: David Hildenbrand Reviewed-by: Cornelia Huck Reviewed-by: Thomas Huth Link: https://lore.kernel.org/r/20200131100205.74720-3-frankja@linux.ibm.com Signed-off-by: Christian Borntraeger --- arch/s390/include/asm/kvm_host.h | 5 +++++ arch/s390/kvm/kvm-s390.c | 18 +++++++----------- 2 files changed, 12 insertions(+), 11 deletions(-) (limited to 'arch/s390') diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 02f4c21c57f6..73044545ecac 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -122,6 +122,11 @@ struct mcck_volatile_info { __u32 reserved; }; +#define CR0_INITIAL_MASK (CR0_UNUSED_56 | CR0_INTERRUPT_KEY_SUBMASK | \ + CR0_MEASUREMENT_ALERT_SUBMASK) +#define CR14_INITIAL_MASK (CR14_UNUSED_32 | CR14_UNUSED_33 | \ + CR14_EXTERNAL_DAMAGE_SUBMASK) + #define CPUSTAT_STOPPED 0x80000000 #define CPUSTAT_WAIT 0x10000000 #define CPUSTAT_ECALL_PEND 0x08000000 diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 876802894b35..bb072866bd69 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -2847,19 +2847,15 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) { /* this equals initial cpu reset in pop, but we don't switch to ESA */ - vcpu->arch.sie_block->gpsw.mask = 0UL; - vcpu->arch.sie_block->gpsw.addr = 0UL; + vcpu->arch.sie_block->gpsw.mask = 0; + vcpu->arch.sie_block->gpsw.addr = 0; kvm_s390_set_prefix(vcpu, 0); kvm_s390_set_cpu_timer(vcpu, 0); - 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] = 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; + vcpu->arch.sie_block->ckc = 0; + vcpu->arch.sie_block->todpr = 0; + memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr)); + vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK; + vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK; vcpu->run->s.regs.fpc = 0; vcpu->arch.sie_block->gbea = 1; vcpu->arch.sie_block->pp = 0; -- cgit v1.2.3-59-g8ed1b From 7de3f1423ff9431f3bd5023bb78d1e062314e7f0 Mon Sep 17 00:00:00 2001 From: Janosch Frank Date: Fri, 31 Jan 2020 05:02:02 -0500 Subject: KVM: s390: Add new reset vcpu API The architecture states that we need to reset local IRQs for all CPU resets. Because the old reset interface did not support the normal CPU reset we never did that on a normal reset. Let's implement an interface for the missing normal and clear resets and reset all local IRQs, registers and control structures as stated in the architecture. Userspace might already reset the registers via the vcpu run struct, but as we need the interface for the interrupt clearing part anyway, we implement the resets fully and don't rely on userspace to reset the rest. Signed-off-by: Janosch Frank Reviewed-by: Cornelia Huck Reviewed-by: Christian Borntraeger Reviewed-by: Thomas Huth Link: https://lore.kernel.org/r/20200131100205.74720-4-frankja@linux.ibm.com Signed-off-by: Christian Borntraeger --- Documentation/virt/kvm/api.txt | 43 +++++++++++++++++++++ arch/s390/kvm/kvm-s390.c | 84 ++++++++++++++++++++++++++++-------------- include/uapi/linux/kvm.h | 5 +++ 3 files changed, 105 insertions(+), 27 deletions(-) (limited to 'arch/s390') diff --git a/Documentation/virt/kvm/api.txt b/Documentation/virt/kvm/api.txt index ebb37b34dcfc..73448764f544 100644 --- a/Documentation/virt/kvm/api.txt +++ b/Documentation/virt/kvm/api.txt @@ -4168,6 +4168,42 @@ This ioctl issues an ultravisor call to terminate the secure guest, unpins the VPA pages and releases all the device pages that are used to track the secure pages by hypervisor. +4.122 KVM_S390_NORMAL_RESET + +Capability: KVM_CAP_S390_VCPU_RESETS +Architectures: s390 +Type: vcpu ioctl +Parameters: none +Returns: 0 + +This ioctl resets VCPU registers and control structures according to +the cpu reset definition in the POP (Principles Of Operation). + +4.123 KVM_S390_INITIAL_RESET + +Capability: none +Architectures: s390 +Type: vcpu ioctl +Parameters: none +Returns: 0 + +This ioctl resets VCPU registers and control structures according to +the initial cpu reset definition in the POP. However, the cpu is not +put into ESA mode. This reset is a superset of the normal reset. + +4.124 KVM_S390_CLEAR_RESET + +Capability: KVM_CAP_S390_VCPU_RESETS +Architectures: s390 +Type: vcpu ioctl +Parameters: none +Returns: 0 + +This ioctl resets VCPU registers and control structures according to +the clear cpu reset definition in the POP. However, the cpu is not put +into ESA mode. This reset is a superset of the initial reset. + + 5. The kvm_run structure ------------------------ @@ -5396,3 +5432,10 @@ handling by KVM (as some KVM hypercall may be mistakenly treated as TLB flush hypercalls by Hyper-V) so userspace should disable KVM identification in CPUID and only exposes Hyper-V identification. In this case, guest thinks it's running on Hyper-V and only use Hyper-V hypercalls. + +8.22 KVM_CAP_S390_VCPU_RESETS + +Architectures: s390 + +This capability indicates that the KVM_S390_NORMAL_RESET and +KVM_S390_CLEAR_RESET ioctls are available. diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index bb072866bd69..e39f6ef97b09 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -529,6 +529,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_S390_CMMA_MIGRATION: case KVM_CAP_S390_AIS: case KVM_CAP_S390_AIS_MIGRATION: + case KVM_CAP_S390_VCPU_RESETS: r = 1; break; case KVM_CAP_S390_HPAGE_1M: @@ -2844,29 +2845,6 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) } -static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) -{ - /* this equals initial cpu reset in pop, but we don't switch to ESA */ - vcpu->arch.sie_block->gpsw.mask = 0; - vcpu->arch.sie_block->gpsw.addr = 0; - kvm_s390_set_prefix(vcpu, 0); - kvm_s390_set_cpu_timer(vcpu, 0); - vcpu->arch.sie_block->ckc = 0; - vcpu->arch.sie_block->todpr = 0; - memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr)); - vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK; - vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK; - vcpu->run->s.regs.fpc = 0; - vcpu->arch.sie_block->gbea = 1; - vcpu->arch.sie_block->pp = 0; - vcpu->arch.sie_block->fpf &= ~FPF_BPBC; - vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; - kvm_clear_async_pf_completion_queue(vcpu); - if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) - kvm_s390_vcpu_stop(vcpu); - kvm_s390_clear_local_irqs(vcpu); -} - void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) { mutex_lock(&vcpu->kvm->lock); @@ -3281,10 +3259,53 @@ static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, return r; } -static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) +static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu) { - kvm_s390_vcpu_initial_reset(vcpu); - return 0; + vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI; + vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; + memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb)); + + kvm_clear_async_pf_completion_queue(vcpu); + if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) + kvm_s390_vcpu_stop(vcpu); + kvm_s390_clear_local_irqs(vcpu); +} + +static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) +{ + /* Initial reset is a superset of the normal reset */ + kvm_arch_vcpu_ioctl_normal_reset(vcpu); + + /* this equals initial cpu reset in pop, but we don't switch to ESA */ + vcpu->arch.sie_block->gpsw.mask = 0; + vcpu->arch.sie_block->gpsw.addr = 0; + kvm_s390_set_prefix(vcpu, 0); + kvm_s390_set_cpu_timer(vcpu, 0); + vcpu->arch.sie_block->ckc = 0; + vcpu->arch.sie_block->todpr = 0; + memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr)); + vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK; + vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK; + vcpu->run->s.regs.fpc = 0; + vcpu->arch.sie_block->gbea = 1; + vcpu->arch.sie_block->pp = 0; + vcpu->arch.sie_block->fpf &= ~FPF_BPBC; +} + +static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu) +{ + struct kvm_sync_regs *regs = &vcpu->run->s.regs; + + /* Clear reset is a superset of the initial reset */ + kvm_arch_vcpu_ioctl_initial_reset(vcpu); + + memset(®s->gprs, 0, sizeof(regs->gprs)); + memset(®s->vrs, 0, sizeof(regs->vrs)); + memset(®s->acrs, 0, sizeof(regs->acrs)); + memset(®s->gscb, 0, sizeof(regs->gscb)); + + regs->etoken = 0; + regs->etoken_extension = 0; } int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) @@ -4357,8 +4378,17 @@ long kvm_arch_vcpu_ioctl(struct file *filp, r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); break; } + case KVM_S390_CLEAR_RESET: + r = 0; + kvm_arch_vcpu_ioctl_clear_reset(vcpu); + break; case KVM_S390_INITIAL_RESET: - r = kvm_arch_vcpu_ioctl_initial_reset(vcpu); + r = 0; + kvm_arch_vcpu_ioctl_initial_reset(vcpu); + break; + case KVM_S390_NORMAL_RESET: + r = 0; + kvm_arch_vcpu_ioctl_normal_reset(vcpu); break; case KVM_SET_ONE_REG: case KVM_GET_ONE_REG: { diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index f0a16b4adbbd..4b95f9a31a2f 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1009,6 +1009,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_PPC_GUEST_DEBUG_SSTEP 176 #define KVM_CAP_ARM_NISV_TO_USER 177 #define KVM_CAP_ARM_INJECT_EXT_DABT 178 +#define KVM_CAP_S390_VCPU_RESETS 179 #ifdef KVM_CAP_IRQ_ROUTING @@ -1473,6 +1474,10 @@ struct kvm_enc_region { /* Available with KVM_CAP_ARM_SVE */ #define KVM_ARM_VCPU_FINALIZE _IOW(KVMIO, 0xc2, int) +/* Available with KVM_CAP_S390_VCPU_RESETS */ +#define KVM_S390_NORMAL_RESET _IO(KVMIO, 0xc3) +#define KVM_S390_CLEAR_RESET _IO(KVMIO, 0xc4) + /* Secure Encrypted Virtualization command */ enum sev_cmd_id { /* Guest initialization commands */ -- cgit v1.2.3-59-g8ed1b