On 13/03/2019 01:57, Heyi Guo wrote:
> Dear all,
>
> Really appreciate your comments and information. For "Live Physical
> Time", is there any document to tell the whole story? And may I know the
> timeline to make it happen?
The documentation is available here:
https://developer.arm.com/docs/den
On 12/03/2019 14:12, Marc Zyngier wrote:
> Hi Peter,
>
> On 12/03/2019 10:08, Peter Maydell wrote:
>> On Tue, 12 Mar 2019 at 06:10, Heyi Guo wrote:
>>>
>>> When we stop a VM for more than 30 seconds and then resume it, by qemu
>>> monitor command "stop" and "cont", Linux on VM will complain of "s
On 19/11/2021 13:47, Chao Peng wrote:
> Signed-off-by: Yu Zhang
> Signed-off-by: Chao Peng
> ---
> virt/kvm/kvm_main.c | 23 +++
> 1 file changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 271cef8d1cd0..b8673490d301 1
On 23/02/2022 11:49, Chao Peng wrote:
> On Thu, Feb 17, 2022 at 11:09:35AM -0800, Andy Lutomirski wrote:
>> On Thu, Feb 17, 2022, at 5:06 AM, Chao Peng wrote:
>>> On Fri, Feb 11, 2022 at 03:33:35PM -0800, Andy Lutomirski wrote:
On 1/18/22 05:21, Chao Peng wrote:
> From: "Kirill A. Shutemov
On 18/01/2022 13:21, Chao Peng wrote:
> This is the v4 of this series which try to implement the fd-based KVM
> guest private memory. The patches are based on latest kvm/queue branch
> commit:
>
> fea31d169094 KVM: x86/pmu: Fix available_event_types check for
>REF_CPU_CYCLES even
Hi Jun,
On 02/02/2022 02:28, Nakajima, Jun wrote:
>
>> On Jan 28, 2022, at 8:47 AM, Steven Price wrote:
>>
>> On 18/01/2022 13:21, Chao Peng wrote:
>>> This is the v4 of this series which try to implement the fd-based KVM
>>> guest private memory. Th
On 18/01/2022 13:21, Chao Peng wrote:
> Introduce a new memfd_create() flag indicating the content of the
> created memfd is inaccessible from userspace. It does this by force
> setting F_SEAL_INACCESSIBLE seal when the file is created. It also set
> F_SEAL_SEAL to prevent future sealing, which mea
On 29/03/2022 18:01, Quentin Perret wrote:
> On Monday 28 Mar 2022 at 18:58:35 (+), Sean Christopherson wrote:
>> On Mon, Mar 28, 2022, Quentin Perret wrote:
>>> Hi Sean,
>>>
>>> Thanks for the reply, this helps a lot.
>>>
>>> On Monday 28 Mar 2022 at 17:13:10 (+), Sean Christopherson wrote
On 04/05/2021 18:40, Catalin Marinas wrote:
On Thu, Apr 29, 2021 at 05:06:41PM +0100, Steven Price wrote:
On 28/04/2021 18:07, Catalin Marinas wrote:
I probably asked already but is the only way to map a standard RAM page
(not device) in stage 2 via the fault handler? One case I had in mind
On 04/05/2021 18:44, Catalin Marinas wrote:
On Thu, Apr 29, 2021 at 05:06:07PM +0100, Steven Price wrote:
On 27/04/2021 18:58, Catalin Marinas wrote:
On Fri, Apr 16, 2021 at 04:43:08PM +0100, Steven Price wrote:
diff --git a/arch/arm64/include/uapi/asm/kvm.h
b/arch/arm64/include/uapi/asm
On 10/05/2021 19:35, Catalin Marinas wrote:
On Fri, May 07, 2021 at 07:25:39PM +0100, Catalin Marinas wrote:
On Thu, May 06, 2021 at 05:15:25PM +0100, Steven Price wrote:
On 04/05/2021 18:40, Catalin Marinas wrote:
On Thu, Apr 29, 2021 at 05:06:41PM +0100, Steven Price wrote:
Given the
On 26/03/2021 18:56, Catalin Marinas wrote:
Hi Steven,
On Fri, Mar 12, 2021 at 03:18:57PM +, Steven Price wrote:
A KVM guest could store tags in a page even if the VMM hasn't mapped
the page with PROT_MTE. So when restoring pages from swap we will
need to check to see if there ar
On 28/03/2021 13:21, Catalin Marinas wrote:
On Sat, Mar 27, 2021 at 03:23:24PM +, Catalin Marinas wrote:
On Fri, Mar 12, 2021 at 03:18:58PM +, Steven Price wrote:
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 77cb2d28f2a4..b31b7a821f90 100644
--- a/arch/arm64/kvm/mmu.c
On 30/03/2021 11:13, Catalin Marinas wrote:
On Mon, Mar 29, 2021 at 04:55:29PM +0100, Steven Price wrote:
On 26/03/2021 18:56, Catalin Marinas wrote:
On Fri, Mar 12, 2021 at 03:18:57PM +, Steven Price wrote:
A KVM guest could store tags in a page even if the VMM hasn't mapped
the
On 31/03/2021 10:32, David Hildenbrand wrote:
On 31.03.21 11:21, Catalin Marinas wrote:
On Wed, Mar 31, 2021 at 09:34:44AM +0200, David Hildenbrand wrote:
On 30.03.21 12:30, Catalin Marinas wrote:
On Mon, Mar 29, 2021 at 05:06:51PM +0100, Steven Price wrote:
On 28/03/2021 13:21, Catalin
On 31/03/2021 19:43, Catalin Marinas wrote:
On Wed, Mar 31, 2021 at 11:41:20AM +0100, Steven Price wrote:
On 31/03/2021 10:32, David Hildenbrand wrote:
On 31.03.21 11:21, Catalin Marinas wrote:
On Wed, Mar 31, 2021 at 09:34:44AM +0200, David Hildenbrand wrote:
On 30.03.21 12:30, Catalin
On 07/04/2021 16:14, Catalin Marinas wrote:
On Wed, Apr 07, 2021 at 11:20:18AM +0100, Steven Price wrote:
On 31/03/2021 19:43, Catalin Marinas wrote:
When a slot is added by the VMM, if it asked for MTE in guest (I guess
that's an opt-in by the VMM, haven't checked the other patche
On 09/03/2021 11:01, Peter Maydell wrote:
On Mon, 1 Mar 2021 at 14:23, Steven Price wrote:
A new capability (KVM_CAP_ARM_MTE) identifies that the kernel supports
granting a guest access to the tags, and provides a mechanism for the
VMM to enable it.
A new ioctl (KVM_ARM_MTE_COPY_TAGS
en swapped out.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/pgtable.h | 2 +-
arch/arm64/kernel/mte.c | 16
2 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index e1
the VMM to easily read/write the
tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
while the VMM can still read/write the tags for the purpose of
migration.
Signed-off-by: Steven Price
---
arch/arm64/include/uapi/asm/kvm.h | 14 +++
arch/arm64/kvm/arm.c
e tags are correctly saved/restored across swap.
Actually exposing the new capability to user space happens in a later
patch.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_emulate.h | 3 +++
arch/arm64/include/asm/kvm_host.h| 3 +++
arch/arm64/kvm/hyp/exception.c | 3 ++-
arch
mapping
in userspace. The above capability gates access to the ioctl.
Signed-off-by: Steven Price
---
Documentation/virt/kvm/api.rst | 53 ++
1 file changed, 53 insertions(+)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index
It's now safe for the VMM to enable MTE in a guest, so expose the
capability to user space.
Signed-off-by: Steven Price
---
arch/arm64/kvm/arm.c | 9 +
arch/arm64/kvm/sys_regs.c | 3 +++
2 files changed, 12 insertions(+)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/
r now).
* Correctly hold slots_lock during the ioctl (rather than
embarrassingly not do any locking as before...).
* Add the structure definition to the documentation and some
improvements suggested by Peter.
[1] https://lore.kernel.org/r/20210301142315.30920-1-steven.price%40arm.com
Steven Pri
Define the new system registers that MTE introduces and context switch
them. The MTE feature is still hidden from the ID register as it isn't
supported in a VM yet.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_host.h | 6 ++
arch/arm64/include/asm/kvm_
On 20/05/2021 09:51, Marc Zyngier wrote:
> On Wed, 19 May 2021 11:48:21 +0100,
> Steven Price wrote:
>>
>> On 17/05/2021 17:45, Marc Zyngier wrote:
>>> On Mon, 17 May 2021 13:32:35 +0100,
>>> Steven Price wrote:
[...]
>>>>
On 20/05/2021 12:54, Catalin Marinas wrote:
> On Mon, May 17, 2021 at 01:32:35PM +0100, Steven Price wrote:
>> diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
>> index c5d1f3c87dbd..8660f6a03f51 100644
>> --- a/arch/arm64/kvm/mmu.c
>> +++ b/arch/arm64/kvm
On 20/05/2021 10:46, Marc Zyngier wrote:
> On Wed, 19 May 2021 14:04:20 +0100,
> Steven Price wrote:
>>
>> On 17/05/2021 18:17, Marc Zyngier wrote:
>>> On Mon, 17 May 2021 13:32:36 +0100,
>>> Steven Price wrote:
>>>>
>>>> Define the
On 20/05/2021 13:05, Catalin Marinas wrote:
> On Mon, May 17, 2021 at 01:32:38PM +0100, Steven Price wrote:
>> diff --git a/arch/arm64/include/uapi/asm/kvm.h
>> b/arch/arm64/include/uapi/asm/kvm.h
>> index 24223adae150..b3edde68bc3e 100644
>> --- a/arch/arm64/include/u
On 20/05/2021 18:50, Catalin Marinas wrote:
> On Thu, May 20, 2021 at 04:05:46PM +0100, Steven Price wrote:
>> On 20/05/2021 12:54, Catalin Marinas wrote:
>>> On Mon, May 17, 2021 at 01:32:35PM +0100, Steven Price wrote:
>>>> diff --git a/arch/arm64/kvm/mmu.c b/a
On 20/05/2021 18:27, Catalin Marinas wrote:
> On Thu, May 20, 2021 at 04:58:01PM +0100, Steven Price wrote:
>> On 20/05/2021 13:05, Catalin Marinas wrote:
>>> On Mon, May 17, 2021 at 01:32:38PM +0100, Steven Price wrote:
>>>> diff --git a/arch/arm64/kvm/arm.c b/a
PAGE_SIZE / MTE_GRANULE_SIZE.
* Correct the definition of struct kvm_arm_copy_mte_tags in the docs.
Also avoid mentioning MTE_GRANULE_SIZE as it isn't exported to
userspace.
[1] https://lore.kernel.org/r/20210517123239.8025-1-steven.pr...@arm.com/
Catalin Marinas (1):
arm64: Handl
g the process. Instead implement a new (global) spinlock to protect
the mte_sync_page_tags() function.
Fixes: 34bfeea4a9e9 ("arm64: mte: Clear the tags when a page is mapped in
user-space with PROT_MTE")
Reviewed-by: Catalin Marinas
Signed-off-by: Steven Price
---
---
arch/arm64/ke
mapping
in userspace. The above capability gates access to the ioctl.
Signed-off-by: Steven Price
---
Documentation/virt/kvm/api.rst | 52 ++
1 file changed, 52 insertions(+)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index
the page
tags on allocation in __alloc_zeroed_user_highpage() if the vma flags
have VM_MTE set.
Signed-off-by: Catalin Marinas
Signed-off-by: Steven Price
---
arch/arm64/include/asm/page.h | 6 --
arch/arm64/mm/fault.c | 21 +
2 files changed, 25 insertions(+)
e will not have been swapped out.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/mte.h | 4 ++--
arch/arm64/include/asm/pgtable.h | 22 +++---
arch/arm64/kernel/mte.c | 16
3 files changed, 33 insertions(+), 9 deletions(-)
diff --git a/
e tags are correctly saved/restored across swap.
Actually exposing the new capability to user space happens in a later
patch.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_emulate.h | 3 ++
arch/arm64/include/asm/kvm_host.h| 3 ++
arch/arm64/kvm/hyp/exception.c | 3 +-
arch
It's now safe for the VMM to enable MTE in a guest, so expose the
capability to user space.
Signed-off-by: Steven Price
---
arch/arm64/kvm/arm.c | 9 +
arch/arm64/kvm/reset.c| 3 ++-
arch/arm64/kvm/sys_regs.c | 3 +++
3 files changed, 14 insertions(+), 1 deletion(-)
diff
Define the new system registers that MTE introduces and context switch
them. The MTE feature is still hidden from the ID register as it isn't
supported in a VM yet.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_host.h | 6 ++
arch/arm64/include/asm/kvm_
the VMM to easily read/write the
tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
while the VMM can still read/write the tags for the purpose of
migration.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_host.h | 3 ++
arch/arm64/include/asm/mte-def.h |
On 24/05/2021 19:11, Catalin Marinas wrote:
> On Fri, May 21, 2021 at 10:42:09AM +0100, Steven Price wrote:
>> On 20/05/2021 18:27, Catalin Marinas wrote:
>>> On Thu, May 20, 2021 at 04:58:01PM +0100, Steven Price wrote:
>>>> On 20/05/2021 13:05, Catalin Marinas wro
On 09/03/2021 17:06, Marc Zyngier wrote:
On Mon, 01 Mar 2021 14:23:11 +,
Steven Price wrote:
Add a new VM feature 'KVM_ARM_CAP_MTE' which enables memory tagging
for a VM. This will expose the feature to the guest and automatically
tag memory pages touched by the VM as PG_mte_t
On 09/03/2021 17:27, Marc Zyngier wrote:
On Mon, 01 Mar 2021 14:23:12 +,
Steven Price wrote:
Define the new system registers that MTE introduces and context switch
them. The MTE feature is still hidden from the ID register as it isn't
supported in a VM yet.
Signed-off-by: Steven
On 09/03/2021 17:57, Marc Zyngier wrote:
On Mon, 01 Mar 2021 14:23:14 +,
Steven Price wrote:
The VMM may not wish to have it's own mapping of guest memory mapped
with PROT_MTE because this causes problems if the VMM has tag checking
enabled (the guest controls the tags in physical RA
On 12/05/2021 18:45, Catalin Marinas wrote:
> On Wed, May 12, 2021 at 04:46:48PM +0100, Steven Price wrote:
>> On 10/05/2021 19:35, Catalin Marinas wrote:
>>> On Fri, May 07, 2021 at 07:25:39PM +0100, Catalin Marinas wrote:
>>>> On Thu, May 06, 2021 at 05:15:
andle MTE tags zeroing in __alloc_zeroed_user_highpage()
Steven Price (7):
arm64: mte: Handle race when synchronising tags
arm64: mte: Sync tags for pages where PTE is untagged
arm64: kvm: Introduce MTE VM feature
arm64: kvm: Save/restore MTE registers
arm64: kvm: Expose KVM_ARM_CAP_MTE
KVM: arm64: ioctl
e tags are correctly saved/restored across swap.
Actually exposing the new capability to user space happens in a later
patch.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_emulate.h | 3 +++
arch/arm64/include/asm/kvm_host.h| 3 +++
arch/arm64/kvm/hyp/exception.c | 3 ++-
arch
g the process. Instead implement a new (global) spinlock to protect
the mte_sync_page_tags() function.
Fixes: 34bfeea4a9e9 ("arm64: mte: Clear the tags when a page is mapped in
user-space with PROT_MTE")
Signed-off-by: Steven Price
---
---
arch/arm64/kernel/mte.c | 21 ++
the page
tags on allocation in __alloc_zeroed_user_highpage() if the vma flags
have VM_MTE set.
Signed-off-by: Catalin Marinas
Signed-off-by: Steven Price
---
arch/arm64/include/asm/page.h | 6 --
arch/arm64/mm/fault.c | 21 +
2 files changed, 25 insertions(+)
Define the new system registers that MTE introduces and context switch
them. The MTE feature is still hidden from the ID register as it isn't
supported in a VM yet.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_host.h | 6 ++
arch/arm64/include/asm/kvm_
e will not have been swapped out.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/pgtable.h | 9 +++--
arch/arm64/kernel/mte.c | 16 ++--
2 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm
mapping
in userspace. The above capability gates access to the ioctl.
Signed-off-by: Steven Price
---
Documentation/virt/kvm/api.rst | 53 ++
1 file changed, 53 insertions(+)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index
It's now safe for the VMM to enable MTE in a guest, so expose the
capability to user space.
Signed-off-by: Steven Price
---
arch/arm64/kvm/arm.c | 9 +
arch/arm64/kvm/sys_regs.c | 3 +++
2 files changed, 12 insertions(+)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/
the VMM to easily read/write the
tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
while the VMM can still read/write the tags for the purpose of
migration.
Signed-off-by: Steven Price
---
arch/arm64/include/uapi/asm/kvm.h | 11 +
arch/arm64/kvm/arm.c
On 17/05/2021 15:03, Marc Zyngier wrote:
> Hi Steven,
Hi Marc,
> On Mon, 17 May 2021 13:32:32 +0100,
> Steven Price wrote:
>>
>> mte_sync_tags() used test_and_set_bit() to set the PG_mte_tagged flag
>> before restoring/zeroing the MTE tags. However if another thread
On 17/05/2021 17:14, Marc Zyngier wrote:
> On Mon, 17 May 2021 13:32:34 +0100,
> Steven Price wrote:
>>
>> A KVM guest could store tags in a page even if the VMM hasn't mapped
>> the page with PROT_MTE. So when restoring pages from swap we will
>> need to check
On 17/05/2021 17:45, Marc Zyngier wrote:
> On Mon, 17 May 2021 13:32:35 +0100,
> Steven Price wrote:
>>
>> Add a new VM feature 'KVM_ARM_CAP_MTE' which enables memory tagging
>> for a VM. This will expose the feature to the guest and automatically
>&g
On 17/05/2021 18:17, Marc Zyngier wrote:
> On Mon, 17 May 2021 13:32:36 +0100,
> Steven Price wrote:
>>
>> Define the new system registers that MTE introduces and context switch
>> them. The MTE feature is still hidden from the ID register as it isn't
>> support
On 17/05/2021 18:40, Marc Zyngier wrote:
> On Mon, 17 May 2021 13:32:37 +0100,
> Steven Price wrote:
>>
>> It's now safe for the VMM to enable MTE in a guest, so expose the
>> capability to user space.
>>
>> Signed-off-by: Steven Price
>> ---
>&
On 17/05/2021 19:04, Marc Zyngier wrote:
> On Mon, 17 May 2021 13:32:38 +0100,
> Steven Price wrote:
>>
>> The VMM may not wish to have it's own mapping of guest memory mapped
>> with PROT_MTE because this causes problems if the VMM has tag checking
>> enab
On 17/05/2021 19:09, Marc Zyngier wrote:
> On Mon, 17 May 2021 13:32:39 +0100,
> Steven Price wrote:
>>
>> A new capability (KVM_CAP_ARM_MTE) identifies that the kernel supports
>> granting a guest access to the tags, and provides a mechanism for the
>> VMM t
On 20/05/2021 11:09, Marc Zyngier wrote:
> On Wed, 19 May 2021 14:26:31 +0100,
> Steven Price wrote:
>>
>> On 17/05/2021 18:40, Marc Zyngier wrote:
>>> On Mon, 17 May 2021 13:32:37 +0100,
>>> Steven Price wrote:
>>>>
>>>> It&#x
On 20/05/2021 11:24, Marc Zyngier wrote:
> On Wed, 19 May 2021 15:09:23 +0100,
> Steven Price wrote:
>>
>> On 17/05/2021 19:09, Marc Zyngier wrote:
>>> On Mon, 17 May 2021 13:32:39 +0100,
>>> Steven Price wrote:
[...]>>>> +bytes (i.e. 1/16th
On 19/05/2021 19:06, Catalin Marinas wrote:
> On Mon, May 17, 2021 at 01:32:34PM +0100, Steven Price wrote:
>> A KVM guest could store tags in a page even if the VMM hasn't mapped
>> the page with PROT_MTE. So when restoring pages from swap we will
>> need to check to
On 20/05/2021 13:25, Catalin Marinas wrote:
> On Thu, May 20, 2021 at 12:55:21PM +0100, Steven Price wrote:
>> On 19/05/2021 19:06, Catalin Marinas wrote:
>>> On Mon, May 17, 2021 at 01:32:34PM +0100, Steven Price wrote:
>>>> A KVM guest could store tags in a page
g/r/20210312151902.17853-1-steven.price%40arm.com
Steven Price (6):
arm64: mte: Sync tags for pages where PTE is untagged
arm64: kvm: Introduce MTE VM feature
arm64: kvm: Save/restore MTE registers
arm64: kvm: Expose KVM_ARM_CAP_MTE
KVM: arm64: ioctl to fetch/store tags in a guest
KVM: a
It's now safe for the VMM to enable MTE in a guest, so expose the
capability to user space.
Signed-off-by: Steven Price
---
arch/arm64/kvm/arm.c | 9 +
arch/arm64/kvm/sys_regs.c | 3 +++
2 files changed, 12 insertions(+)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/
the VMM to easily read/write the
tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
while the VMM can still read/write the tags for the purpose of
migration.
Signed-off-by: Steven Price
---
arch/arm64/include/uapi/asm/kvm.h | 14 +++
arch/arm64/kvm/arm.c
en swapped out.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/pgtable.h | 2 +-
arch/arm64/kernel/mte.c | 16
2 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index e1
mapping
in userspace. The above capability gates access to the ioctl.
Signed-off-by: Steven Price
---
Documentation/virt/kvm/api.rst | 53 ++
1 file changed, 53 insertions(+)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index
e tags are correctly saved/restored across swap.
Actually exposing the new capability to user space happens in a later
patch.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_emulate.h | 3 +++
arch/arm64/include/asm/kvm_host.h| 3 +++
arch/arm64/kvm/hyp/exception.c | 3 ++-
arch
Define the new system registers that MTE introduces and context switch
them. The MTE feature is still hidden from the ID register as it isn't
supported in a VM yet.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_host.h | 6 ++
arch/arm64/include/asm/kvm_
On 27/04/2021 18:43, Catalin Marinas wrote:
On Fri, Apr 16, 2021 at 04:43:04PM +0100, Steven Price wrote:
A KVM guest could store tags in a page even if the VMM hasn't mapped
the page with PROT_MTE. So when restoring pages from swap we will
need to check to see if there are any saved tags
On 27/04/2021 18:58, Catalin Marinas wrote:
On Fri, Apr 16, 2021 at 04:43:08PM +0100, Steven Price wrote:
diff --git a/arch/arm64/include/uapi/asm/kvm.h
b/arch/arm64/include/uapi/asm/kvm.h
index 24223adae150..2b85a047c37d 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include
On 28/04/2021 18:07, Catalin Marinas wrote:
On Fri, Apr 16, 2021 at 04:43:05PM +0100, Steven Price wrote:
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 77cb2d28f2a4..5f8e165ea053 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -879,6 +879,26 @@ static int
documentation patch
[1] https://lore.kernel.org/r/20210205135803.48321-1-steven.pr...@arm.com/
Steven Price (6):
arm64: mte: Sync tags for pages where PTE is untagged
arm64: kvm: Introduce MTE VM feature
arm64: kvm: Save/restore MTE registers
arm64: kvm: Expose KVM_ARM_CAP_MTE
KVM: arm64: ioctl to
en swapped out.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/pgtable.h | 2 +-
arch/arm64/kernel/mte.c | 16
2 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index e1
Define the new system registers that MTE introduces and context switch
them. The MTE feature is still hidden from the ID register as it isn't
supported in a VM yet.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_host.h | 6 ++
arch/arm64/include/asm/kvm_
the VMM to easily read/write the
tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
while the VMM can still read/write the tags for the purpose of
migration.
Signed-off-by: Steven Price
---
arch/arm64/include/uapi/asm/kvm.h | 13 +++
arch/arm64/kvm/arm.c
e tags are correctly saved/restored across swap.
Actually exposing the new capability to user space happens in a later
patch.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_emulate.h | 3 +++
arch/arm64/include/asm/kvm_host.h| 3 +++
arch/arm64/kvm/hyp/exception.c | 3 ++-
arch
It's now safe for the VMM to enable MTE in a guest, so expose the
capability to user space.
Signed-off-by: Steven Price
---
arch/arm64/kvm/arm.c | 9 +
arch/arm64/kvm/sys_regs.c | 3 +++
2 files changed, 12 insertions(+)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/
mapping
in userspace. The above capability gates access to the ioctl.
Signed-off-by: Steven Price
---
Documentation/virt/kvm/api.rst | 37 ++
1 file changed, 37 insertions(+)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index
On 02/02/2021 15:36, Marc Zyngier wrote:
On 2021-01-15 15:28, Steven Price wrote:
Define the new system registers that MTE introduces and context switch
them. The MTE feature is still hidden from the ID register as it isn't
supported in a VM yet.
Signed-off-by: Steven Price
---
arch/
On 02/02/2021 17:12, Marc Zyngier wrote:
On 2021-01-15 15:28, Steven Price wrote:
Add a new VM feature 'KVM_ARM_CAP_MTE' which enables memory tagging
for a VM. This exposes the feature to the guest and automatically tags
memory pages touched by the VM as PG_mte_tagged (and clear
en swapped out.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/pgtable.h | 2 +-
arch/arm64/kernel/mte.c | 16
2 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 50
[1] https://lore.kernel.org/r/20210115152811.8398-1-steven.price%40arm.com
Steven Price (5):
arm64: mte: Sync tags for pages where PTE is untagged
arm64: kvm: Introduce MTE VM feature
arm64: kvm: Save/restore MTE registers
arm64: kvm: Expose KVM_ARM_CAP_MTE
KVM: arm64: ioctl to fetch/store
Define the new system registers that MTE introduces and context switch
them. The MTE feature is still hidden from the ID register as it isn't
supported in a VM yet.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_host.h | 6 ++
arch/arm64/include/asm/kvm_
It's now safe for the VMM to enable MTE in a guest, so expose the
capability to user space.
Signed-off-by: Steven Price
---
arch/arm64/kvm/arm.c | 9 +
arch/arm64/kvm/sys_regs.c | 3 +++
2 files changed, 12 insertions(+)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/
e tags are correctly saved/restored across swap.
Actually exposing the new capability to user space happens in a later
patch.
Signed-off-by: Steven Price
---
arch/arm64/include/asm/kvm_emulate.h | 3 +++
arch/arm64/include/asm/kvm_host.h| 3 +++
arch/arm64/kvm/hyp/exception.c | 3 ++-
arch
the VMM to easily read/write the
tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
while the VMM can still read/write the tags for the purpose of
migration.
Signed-off-by: Steven Price
---
arch/arm64/include/uapi/asm/kvm.h | 13 +++
arch/arm64/kvm/arm.c
Define the new system registers that MTE introduces and context switch
them. The MTE feature is still hidden from the ID register as it isn't
supported in a VM yet.
Signed-off-by: Steven Price
Reviewed-by: Andrew Jones
---
arch/arm64/include/asm/kvm_host.h | 4
arch/
er we want to expose the KVM_CAP before everything is
ready.
Steven Price (2):
arm64: kvm: Save/restore MTE registers
arm64: kvm: Introduce MTE VCPU feature
arch/arm64/include/asm/kvm_emulate.h | 3 +++
arch/arm64/include/asm/kvm_host.h | 7 +++
arch/arm64/include/as
e
tags are correctly saved/restored across swap.
Signed-off-by: Steven Price
Reviewed-by: Andrew Jones
---
arch/arm64/include/asm/kvm_emulate.h | 3 +++
arch/arm64/include/asm/kvm_host.h| 3 +++
arch/arm64/kvm/arm.c | 9 +
arch/arm64/kvm/mmu.c
On 03/12/2020 16:09, Mark Rutland wrote:
On Fri, Nov 27, 2020 at 03:21:11PM +, Steven Price wrote:
It's been a week, and I think the comments on v5 made it clear that
enforcing PROT_MTE requirements on the VMM was probably the wrong
approach. So since I've got swap working correct
On 04/12/2020 08:25, Haibo Xu wrote:
On Fri, 20 Nov 2020 at 17:51, Steven Price wrote:
On 19/11/2020 19:11, Marc Zyngier wrote:
On 2020-11-19 18:42, Andrew Jones wrote:
On Thu, Nov 19, 2020 at 03:45:40PM +, Peter Maydell wrote:
On Thu, 19 Nov 2020 at 15:39, Steven Price wrote:
This
On 03/12/2020 17:07, Marc Zyngier wrote:
diff --git a/arch/arm64/include/asm/sysreg.h
b/arch/arm64/include/asm/sysreg.h
index e2ef4c2edf06..b6668ffa04d9 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -569,7 +569,8 @@
#define SCTLR_ELx_M (BIT(0))
#de
On 07/12/2020 15:27, Peter Maydell wrote:
On Mon, 7 Dec 2020 at 14:48, Steven Price wrote:
Sounds like you are making good progress - thanks for the update. Have
you thought about how the PROT_MTE mappings might work if QEMU itself
were to use MTE? My worry is that we end up with MTE in a
On 08/02/2021 17:31, Peter Maydell wrote:
On Fri, 5 Feb 2021 at 13:58, Steven Price wrote:
The VMM may not wish to have it's own mapping of guest memory mapped
with PROT_MTE because this causes problems if the VMM has tag checking
enabled (the guest controls the tags in physical RAM and
On 19/11/2020 16:24, Catalin Marinas wrote:
On Thu, Nov 19, 2020 at 12:45:52PM +, Steven Price wrote:
On 18/11/2020 17:05, Andrew Jones wrote:
On Wed, Nov 18, 2020 at 04:50:01PM +, Catalin Marinas wrote:
On Wed, Nov 18, 2020 at 04:01:20PM +, Steven Price wrote:
On 17/11/2020 16
On 19/11/2020 19:11, Marc Zyngier wrote:
On 2020-11-19 18:42, Andrew Jones wrote:
On Thu, Nov 19, 2020 at 03:45:40PM +, Peter Maydell wrote:
On Thu, 19 Nov 2020 at 15:39, Steven Price wrote:
> This series adds support for Arm's Memory Tagging Extension (MTE) to
> KVM, allowing
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