On 02.08.2018 11:01, David Hildenbrand wrote:
> On 31.07.2018 10:44, Christian Borntraeger wrote:
>> From: Janosch Frank <frankja@xxxxxxxxxxxxx>
>>
>> When doing skey emulation for huge guests, we now need to fault in
>> pmds, as we don't have PGSTES anymore to store them when we do not
>> have valid table entries.
>>
>> Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
>> ---
>> arch/s390/kvm/kvm-s390.c | 15 ++++--
>> arch/s390/kvm/priv.c | 105 ++++++++++++++++++++++++++-------------
>> 2 files changed, 83 insertions(+), 37 deletions(-)
>>
>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>> index 4cff5e31ca36..662f4d8046db 100644
>> --- a/arch/s390/kvm/kvm-s390.c
>> +++ b/arch/s390/kvm/kvm-s390.c
>> @@ -1551,6 +1551,7 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
>> uint8_t *keys;
>> uint64_t hva;
>> int srcu_idx, i, r = 0;
>> + bool unlocked;
>>
>> if (args->flags != 0)
>> return -EINVAL;
>> @@ -1575,9 +1576,11 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
>> if (r)
>> goto out;
>>
>> + i = 0;
>> down_read(¤t->mm->mmap_sem);
>> srcu_idx = srcu_read_lock(&kvm->srcu);
>> - for (i = 0; i < args->count; i++) {
>> + while (i < args->count) {
>> + unlocked = false;
>> hva = gfn_to_hva(kvm, args->start_gfn + i);
>> if (kvm_is_error_hva(hva)) {
>> r = -EFAULT;
>> @@ -1591,8 +1594,14 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
>> }
>>
>> r = set_guest_storage_key(current->mm, hva, keys[i], 0);
>> - if (r)
>> - break;
>> + if (r) {
>> + r = fixup_user_fault(current, current->mm, hva,
>> + FAULT_FLAG_WRITE, &unlocked);
>> + if (r)
>> + break;
>> + }
>> + if (!r)
>> + i++;
>> }
>> srcu_read_unlock(&kvm->srcu, srcu_idx);
>> up_read(¤t->mm->mmap_sem);
>> diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
>> index eb0eb60c7be6..cfc5a62329f6 100644
>> --- a/arch/s390/kvm/priv.c
>> +++ b/arch/s390/kvm/priv.c
>> @@ -246,9 +246,10 @@ static int try_handle_skey(struct kvm_vcpu *vcpu)
>>
>> static int handle_iske(struct kvm_vcpu *vcpu)
>> {
>> - unsigned long addr;
>> + unsigned long gaddr, vmaddr;
>> unsigned char key;
>> int reg1, reg2;
>> + bool unlocked;
>> int rc;
>>
>> vcpu->stat.instruction_iske++;
>> @@ -262,18 +263,28 @@ static int handle_iske(struct kvm_vcpu *vcpu)
>>
>> kvm_s390_get_regs_rre(vcpu, ®1, ®2);
>>
>> - addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
>> - addr = kvm_s390_logical_to_effective(vcpu, addr);
>> - addr = kvm_s390_real_to_abs(vcpu, addr);
>> - addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
>> - if (kvm_is_error_hva(addr))
>> + gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
>> + gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
>> + gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
>> + vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
>> + if (kvm_is_error_hva(vmaddr))
>> return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
>> -
>> +retry:
>> + unlocked = false;
>> down_read(¤t->mm->mmap_sem);
>> - rc = get_guest_storage_key(current->mm, addr, &key);
>> - up_read(¤t->mm->mmap_sem);
>> + rc = get_guest_storage_key(current->mm, vmaddr, &key);
>> +
>> + if (rc) {
>> + rc = fixup_user_fault(current, current->mm, vmaddr,
>> + FAULT_FLAG_WRITE, &unlocked);
>> + if (!rc) {
>> + up_read(¤t->mm->mmap_sem);
>> + goto retry;
>> + }
>> + }
>> if (rc)
>> return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
>> + up_read(¤t->mm->mmap_sem);
>> vcpu->run->s.regs.gprs[reg1] &= ~0xff;
>> vcpu->run->s.regs.gprs[reg1] |= key;
>> return 0;
>> @@ -281,8 +292,9 @@ static int handle_iske(struct kvm_vcpu *vcpu)
>>
>> static int handle_rrbe(struct kvm_vcpu *vcpu)
>> {
>> - unsigned long addr;
>> + unsigned long vmaddr, gaddr;
>> int reg1, reg2;
>> + bool unlocked;
>> int rc;
>>
>> vcpu->stat.instruction_rrbe++;
>> @@ -296,19 +308,27 @@ static int handle_rrbe(struct kvm_vcpu *vcpu)
>>
>> kvm_s390_get_regs_rre(vcpu, ®1, ®2);
>>
>> - addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
>> - addr = kvm_s390_logical_to_effective(vcpu, addr);
>> - addr = kvm_s390_real_to_abs(vcpu, addr);
>> - addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(addr));
>> - if (kvm_is_error_hva(addr))
>> + gaddr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
>> + gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
>> + gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
>> + vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gaddr));
>> + if (kvm_is_error_hva(vmaddr))
>> return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
>> -
>> +retry:
>> + unlocked = false;
>> down_read(¤t->mm->mmap_sem);
>> - rc = reset_guest_reference_bit(current->mm, addr);
>> - up_read(¤t->mm->mmap_sem);
>> + rc = reset_guest_reference_bit(current->mm, vmaddr);
>> + if (rc < 0) {
>> + rc = fixup_user_fault(current, current->mm, vmaddr,
>> + FAULT_FLAG_WRITE, &unlocked);
>> + if (!rc) {
>> + up_read(¤t->mm->mmap_sem);
>> + goto retry;
>> + }
>> + }
>> if (rc < 0)
>> return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
>> -
>> + up_read(¤t->mm->mmap_sem);
>> kvm_s390_set_psw_cc(vcpu, rc);
>> return 0;
>> }
>> @@ -323,6 +343,7 @@ static int handle_sske(struct kvm_vcpu *vcpu)
>> unsigned long start, end;
>> unsigned char key, oldkey;
>> int reg1, reg2;
>> + bool unlocked;
>> int rc;
>>
>> vcpu->stat.instruction_sske++;
>> @@ -355,19 +376,28 @@ static int handle_sske(struct kvm_vcpu *vcpu)
>> }
>>
>> while (start != end) {
>> - unsigned long addr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
>> + unsigned long vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
>> + unlocked = false;
>>
>> - if (kvm_is_error_hva(addr))
>> + if (kvm_is_error_hva(vmaddr))
>> return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
>>
>> down_read(¤t->mm->mmap_sem);
>> - rc = cond_set_guest_storage_key(current->mm, addr, key, &oldkey,
>> + rc = cond_set_guest_storage_key(current->mm, vmaddr, key, &oldkey,
>> m3 & SSKE_NQ, m3 & SSKE_MR,
>> m3 & SSKE_MC);
>> - up_read(¤t->mm->mmap_sem);
>> - if (rc < 0)
>> +
>> + if (rc < 0) {
>> + rc = fixup_user_fault(current, current->mm, vmaddr,
>> + FAULT_FLAG_WRITE, &unlocked);
>> + rc = !rc ? -EAGAIN : rc;
>> + }
>> + if (rc == -EFAULT)
>> return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
>> - start += PAGE_SIZE;
>> +
>> + up_read(¤t->mm->mmap_sem);
>> + if (rc >= 0)
>> + start += PAGE_SIZE;
>> }
>>
>> if (m3 & (SSKE_MC | SSKE_MR)) {
>> @@ -948,15 +978,16 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
>> }
>>
>> while (start != end) {
>> - unsigned long useraddr;
>> + unsigned long vmaddr;
>> + bool unlocked = false;
>>
>> /* Translate guest address to host address */
>> - useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
>> - if (kvm_is_error_hva(useraddr))
>> + vmaddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
>> + if (kvm_is_error_hva(vmaddr))
>> return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
>>
>> if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
>> - if (clear_user((void __user *)useraddr, PAGE_SIZE))
>> + if (clear_user((void __user *)vmaddr, PAGE_SIZE))
>> return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
>> }
>
> What happened to the patch
>
>
> commit 0230cae75df62de5813a4ca39a425ba439d036da
> Author: Janosch Frank <frankja@xxxxxxxxxxxxx>
> Date: Wed Jul 4 15:50:01 2018 +0100
>
> KVM: s390: Replace clear_user with kvm_clear_guest
>
> kvm_clear_guest also does the dirty tracking for us, which we want to
> have.
>
> ?
>
Guess I am just confused how these patches are handled during the
merge... End result on the branch looks okay.
Stumbled over this while cherry picking patches.
--
Thanks,
David / dhildenb
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