From: Christian Borntraeger <borntraeger@de.ibm.com>
To: David Hildenbrand <david@redhat.com>,
Janosch Frank <frankja@linux.vnet.ibm.com>
Cc: KVM <kvm@vger.kernel.org>, Cornelia Huck <cohuck@redhat.com>,
Thomas Huth <thuth@redhat.com>,
Ulrich Weigand <Ulrich.Weigand@de.ibm.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
linux-s390 <linux-s390@vger.kernel.org>,
Michael Mueller <mimu@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>
Subject: Re: [PATCH v2 25/42] KVM: s390: protvirt: disallow one_reg
Date: Tue, 18 Feb 2020 09:57:27 +0100 [thread overview]
Message-ID: <9efa7a3f-bcf6-1775-e35b-05c9666b13b8@de.ibm.com> (raw)
In-Reply-To: <031b7db2-c255-e32d-782d-d4769dcb6ee8@redhat.com>
On 18.02.20 09:40, David Hildenbrand wrote:
> On 14.02.20 23:26, Christian Borntraeger wrote:
>> From: Janosch Frank <frankja@linux.ibm.com>
>
> "KVM: s390: protvirt: disallow KVM_GET_ONE_REG/KVM_SET_ONE_REG"
>
>>
>> A lot of the registers are controlled by the Ultravisor and never
>> visible to KVM. Some fields in the sie control block are overlayed, like
>> gbea. As no known userspace uses the ONE_REG interface on s390 if sync
>> regs are available, no functionality is lost if it is disabled for
>> protected guests.
>>
>> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
>> Reviewed-by: Thomas Huth <thuth@redhat.com>
>> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
>> [borntraeger@de.ibm.com: patch merging, splitting, fixing]
>> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
>> ---
>> Documentation/virt/kvm/api.rst | 6 ++++--
>> arch/s390/kvm/kvm-s390.c | 3 +++
>> 2 files changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
>> index cb58714fe60d..a82166e5f7d9 100644
>> --- a/Documentation/virt/kvm/api.rst
>> +++ b/Documentation/virt/kvm/api.rst
>> @@ -2117,7 +2117,8 @@ Errors:
>>
>> ====== ============================================================
>> ENOENT no such register
>> - EINVAL invalid register ID, or no such register
>> + EINVAL invalid register ID, or no such register, ONE_REG forbidden
>> + for protected guests (s390)
>
> "invalid register ID, no such register, or used with VMs in protected
> virtualization mode on s390" ?
ack.
>
>> EPERM (arm64) register access not allowed before vcpu finalization
>> ====== ============================================================
>>
>> @@ -2552,7 +2553,8 @@ Errors include:
>>
>> ======== ============================================================
>> ENOENT no such register
>> - EINVAL invalid register ID, or no such register
>> + EINVAL invalid register ID, or no such register, ONE_REG forbidden
>> + for protected guests (s390)
>
> dito
ack
>
>> EPERM (arm64) register access not allowed before vcpu finalization
>> ======== ============================================================
>>
>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>> index 8db82aaf1275..d20a7fa9d480 100644
>> --- a/arch/s390/kvm/kvm-s390.c
>> +++ b/arch/s390/kvm/kvm-s390.c
>> @@ -4638,6 +4638,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
>> case KVM_SET_ONE_REG:
>> case KVM_GET_ONE_REG: {
>> struct kvm_one_reg reg;
>> + r = -EINVAL;
>> + if (kvm_s390_pv_is_protected(vcpu->kvm))
>> + break;
>
> I assume races will be dealt with in your next series.
yes. This is running under vcpu_mutex and we will hold that lock when doing
the gear shift.
>
>> r = -EFAULT;
>> if (copy_from_user(®, argp, sizeof(reg)))
>> break;
>>
>
> With the two nits fixed
>
> Reviewed-by: David Hildenbrand <david@redhat.com>
>
next prev parent reply other threads:[~2020-02-18 8:57 UTC|newest]
Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-14 22:26 [PATCH v2 00/42] KVM: s390: Add support for protected VMs Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 01/42] mm:gup/writeback: add callbacks for inaccessible pages Christian Borntraeger
2020-02-17 9:14 ` David Hildenbrand
2020-02-17 11:10 ` Christian Borntraeger
2020-02-18 8:27 ` David Hildenbrand
2020-02-18 15:46 ` Sean Christopherson
2020-02-18 16:02 ` Will Deacon
2020-02-18 16:15 ` Christian Borntraeger
2020-02-18 21:35 ` Sean Christopherson
2020-02-19 8:31 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 02/42] KVM: s390/interrupt: do not pin adapter interrupt pages Christian Borntraeger
2020-02-17 9:43 ` David Hildenbrand
2020-02-20 12:18 ` David Hildenbrand
2020-02-20 13:31 ` Christian Borntraeger
2020-02-20 13:34 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 03/42] s390/protvirt: introduce host side setup Christian Borntraeger
2020-02-17 9:53 ` David Hildenbrand
2020-02-17 11:11 ` Christian Borntraeger
2020-02-17 11:13 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 04/42] s390/protvirt: add ultravisor initialization Christian Borntraeger
2020-02-17 9:57 ` David Hildenbrand
2020-02-17 11:13 ` Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 05/42] s390/mm: provide memory management functions for protected KVM guests Christian Borntraeger
2020-02-17 10:21 ` David Hildenbrand
2020-02-17 11:28 ` Christian Borntraeger
2020-02-17 12:07 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 06/42] s390/mm: add (non)secure page access exceptions handlers Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 07/42] KVM: s390: protvirt: Add UV debug trace Christian Borntraeger
2020-02-17 10:41 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 08/42] KVM: s390: add new variants of UV CALL Christian Borntraeger
2020-02-17 10:42 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 09/42] KVM: s390: protvirt: Add initial vm and cpu lifecycle handling Christian Borntraeger
2020-02-17 10:56 ` David Hildenbrand
2020-02-17 12:04 ` Christian Borntraeger
2020-02-17 12:09 ` David Hildenbrand
2020-02-17 14:53 ` [PATCH 0/2] example changes Christian Borntraeger
2020-02-17 14:53 ` [PATCH 1/2] lock changes Christian Borntraeger
2020-02-17 14:53 ` [PATCH 2/2] merge vm/cpu create Christian Borntraeger
2020-02-17 15:00 ` Janosch Frank
2020-02-17 15:02 ` Christian Borntraeger
2020-02-19 11:02 ` Christian Borntraeger
2020-02-17 19:18 ` [PATCH 0/2] example changes David Hildenbrand
2020-02-18 8:09 ` [PATCH v2 09/42] KVM: s390: protvirt: Add initial vm and cpu lifecycle handling Christian Borntraeger
2020-02-18 8:39 ` [PATCH v2.1] " Christian Borntraeger
2020-02-18 9:12 ` David Hildenbrand
2020-02-18 21:18 ` Christian Borntraeger
2020-02-19 8:32 ` David Hildenbrand
2020-02-19 11:01 ` Christian Borntraeger
2020-02-18 9:56 ` David Hildenbrand
2020-02-18 20:26 ` Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 10/42] KVM: s390: protvirt: Add KVM api documentation Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 11/42] KVM: s390: protvirt: Secure memory is not mergeable Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 12/42] KVM: s390/mm: Make pages accessible before destroying the guest Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 13/42] KVM: s390: protvirt: Handle SE notification interceptions Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 14/42] KVM: s390: protvirt: Instruction emulation Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 15/42] KVM: s390: protvirt: Add interruption injection controls Christian Borntraeger
2020-02-17 10:59 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 16/42] KVM: s390: protvirt: Implement interruption injection Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 17/42] KVM: s390: protvirt: Add SCLP interrupt handling Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 18/42] KVM: s390: protvirt: Handle spec exception loops Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 19/42] KVM: s390: protvirt: Add new gprs location handling Christian Borntraeger
2020-02-17 11:01 ` David Hildenbrand
2020-02-17 11:33 ` Christian Borntraeger
2020-02-17 14:37 ` Janosch Frank
2020-02-14 22:26 ` [PATCH v2 20/42] KVM: S390: protvirt: Introduce instruction data area bounce buffer Christian Borntraeger
2020-02-17 11:08 ` David Hildenbrand
2020-02-17 14:47 ` Janosch Frank
2020-02-17 15:00 ` Christian Borntraeger
2020-02-17 15:38 ` Janosch Frank
2020-02-17 16:58 ` Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 21/42] KVM: s390: protvirt: handle secure guest prefix pages Christian Borntraeger
2020-02-17 11:11 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 22/42] KVM: s390/mm: handle guest unpin events Christian Borntraeger
2020-02-17 14:23 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 23/42] KVM: s390: protvirt: Write sthyi data to instruction data area Christian Borntraeger
2020-02-17 14:24 ` David Hildenbrand
2020-02-17 18:40 ` Christian Borntraeger
2020-02-17 19:16 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 24/42] KVM: s390: protvirt: STSI handling Christian Borntraeger
2020-02-18 8:35 ` David Hildenbrand
2020-02-18 8:44 ` Christian Borntraeger
2020-02-18 9:08 ` David Hildenbrand
2020-02-18 9:11 ` Christian Borntraeger
2020-02-18 9:13 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 25/42] KVM: s390: protvirt: disallow one_reg Christian Borntraeger
2020-02-18 8:40 ` David Hildenbrand
2020-02-18 8:57 ` Christian Borntraeger [this message]
2020-02-14 22:26 ` [PATCH v2 26/42] KVM: s390: protvirt: Do only reset registers that are accessible Christian Borntraeger
2020-02-18 8:42 ` David Hildenbrand
2020-02-18 9:20 ` Christian Borntraeger
2020-02-18 9:28 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 27/42] KVM: s390: protvirt: Only sync fmt4 registers Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 28/42] KVM: s390: protvirt: Add program exception injection Christian Borntraeger
2020-02-18 9:33 ` David Hildenbrand
2020-02-18 9:37 ` Christian Borntraeger
2020-02-18 9:39 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 29/42] KVM: s390: protvirt: Add diag 308 subcode 8 - 10 handling Christian Borntraeger
2020-02-18 9:38 ` David Hildenbrand
2020-02-19 12:45 ` Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 30/42] KVM: s390: protvirt: UV calls in support of diag308 0, 1 Christian Borntraeger
2020-02-18 9:44 ` David Hildenbrand
2020-02-19 11:53 ` Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 31/42] KVM: s390: protvirt: Report CPU state to Ultravisor Christian Borntraeger
2020-02-18 9:48 ` David Hildenbrand
2020-02-19 19:36 ` Christian Borntraeger
2020-02-19 19:46 ` Christian Borntraeger
2020-02-20 10:52 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 32/42] KVM: s390: protvirt: Support cmd 5 operation state Christian Borntraeger
2020-02-18 9:50 ` David Hildenbrand
2020-02-19 11:06 ` Christian Borntraeger
2020-02-19 11:08 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 33/42] KVM: s390: protvirt: Mask PSW interrupt bits for interception 104 and 112 Christian Borntraeger
2020-02-18 9:53 ` David Hildenbrand
2020-02-18 10:02 ` David Hildenbrand
2020-02-18 10:05 ` Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 34/42] KVM: s390: protvirt: do not inject interrupts after start Christian Borntraeger
2020-02-18 9:53 ` David Hildenbrand
2020-02-18 10:02 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 35/42] KVM: s390: protvirt: Add UV cpu reset calls Christian Borntraeger
2020-02-18 9:54 ` David Hildenbrand
2020-02-14 22:26 ` [PATCH v2 36/42] DOCUMENTATION: Protected virtual machine introduction and IPL Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 37/42] s390/uv: Fix handling of length extensions (already in s390 tree) Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 38/42] s390: protvirt: Add sysfs firmware interface for Ultravisor information Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 39/42] example for future extension: mm:gup/writeback: add callbacks for inaccessible pages: error cases Christian Borntraeger
2020-02-18 16:25 ` Will Deacon
2020-02-18 16:30 ` Christian Borntraeger
2020-02-18 16:33 ` Will Deacon
2020-02-14 22:26 ` [PATCH v2 40/42] example for future extension: mm:gup/writeback: add callbacks for inaccessible pages: source indication Christian Borntraeger
2020-02-17 14:15 ` Ulrich Weigand
2020-02-17 14:38 ` Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 41/42] potential fixup for "s390/mm: provide memory management functions for protected KVM guests" Christian Borntraeger
2020-02-14 22:26 ` [PATCH v2 42/42] KVM: s390: rstify new ioctls in api.rst Christian Borntraeger
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