On 10/23/20 12:40 AM, Ira Weiny wrote:
On Thu, Oct 22, 2020 at 11:19:43AM -0700, Ralph Campbell wrote:
On 10/22/20 8:41 AM, Ira Weiny wrote:
On Thu, Oct 22, 2020 at 11:37:53AM +0530, Aneesh Kumar K.V wrote:
commit 6f42193fd86e ("memremap: don't use a separate devm action for
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From: Ira Weiny
When only user space pkeys are enabled faulting within the kernel was an
unexpected condition which should never happen. Therefore a WARN_ON in
the kernel fault handler would detect if it ever did. Now this is no
longer the case if PKS is enabled and supported.
Report a Pkey
From: Ira Weiny
The PKRS MSR is defined as a per-logical-processor register. This
isolates memory access by logical CPU. Unfortunately, the MSR is not
managed by XSAVE. Therefore, tasks must save/restore the MSR value on
context switch.
Define a saved PKRS value in the task struct, as well
From: Fenghua Yu
PKS allows kernel users to define domains of page mappings which have
additional protections beyond the paging protections.
Add an API to allocate, use, and free a protection key which identifies
such a domain. Export 5 new symbols pks_key_alloc(), pks_mknoaccess(),
From: Ira Weiny
Define a helper, update_pkey_val(), which will be used to support both
Protection Key User (PKU) and the new Protection Key for Supervisor
(PKS) in subsequent patches.
Co-developed-by: Peter Zijlstra
Signed-off-by: Peter Zijlstra
Signed-off-by: Ira Weiny
---
Changes from RFC
From: Thomas Gleixner
Lockdep state handling on NMI enter and exit is nothing specific to X86. It's
not any different on other architectures. Also the extra state type is not
necessary, irqentry_state_t can carry the necessary information as well.
Move it to common code and extend
From: Ira Weiny
The core PKS functionality provides an interface for kernel users to
reserve keys to their domains set up the page tables with those keys and
control access to those domains when needed.
Define test code which exercises the core functionality of PKS via a
debugfs entry. Basic
From: Ira Weiny
The PKRS MSR is not managed by XSAVE. It is preserved through a context
switch but this support leaves exception handling code open to memory
accesses during exceptions.
2 possible places for preserving this state were considered,
irqentry_state_t or pt_regs.[1] pt_regs was
From: Fenghua Yu
Protection Keys for Supervisor pages (PKS) enables fast, hardware thread
specific, manipulation of permission restrictions on supervisor page
mappings. It uses the same mechanism of Protection Keys as those on
User mappings but applies that mechanism to supervisor mappings
From: Ira Weiny
Protection Keys User (PKU) and Protection Keys Supervisor (PKS) work in
similar fashions and can share common defines. Specifically PKS and PKU
each have:
1. A single control register
2. The same number of keys
3. The same number of bits in the register
From: Ira Weiny
In preparation for adding PKS information to struct irqentry_state_t
change all call sites and usages to pass the struct by reference
instead of by value.
While we are editing the call sites it is a good time to standardize on
the name 'irq_state'.
Signed-off-by: Ira Weiny
From: Ira Weiny
Changes from RFC V3[3]
Rebase to TIP master
Update test error output
Standardize on 'irq_state' for state variables
From Dave Hansen
Update commit messages
Add/clean up comments
Add X86_FEATURE_PKS to
On Thu, Oct 22, 2020 at 11:19:43AM -0700, Ralph Campbell wrote:
>
> On 10/22/20 8:41 AM, Ira Weiny wrote:
> > On Thu, Oct 22, 2020 at 11:37:53AM +0530, Aneesh Kumar K.V wrote:
> > > commit 6f42193fd86e ("memremap: don't use a separate devm action for
> > > devmap_managed_enable_get") changed the
On 10/22/20 8:41 AM, Ira Weiny wrote:
On Thu, Oct 22, 2020 at 11:37:53AM +0530, Aneesh Kumar K.V wrote:
commit 6f42193fd86e ("memremap: don't use a separate devm action for
devmap_managed_enable_get") changed the static key updates such that we
now call devmap_managed_enable_put() without
On Thu, Oct 22, 2020 at 11:37:53AM +0530, Aneesh Kumar K.V wrote:
> commit 6f42193fd86e ("memremap: don't use a separate devm action for
> devmap_managed_enable_get") changed the static key updates such that we
> now call devmap_managed_enable_put() without doing the equivalent
>
Looks good,
Reviewed-by: Christoph Hellwig
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> jump label: negative count!
> WARNING: CPU: 52 PID: 1335 at kernel/jump_label.c:235
> static_key_slow_try_dec+0x88/0xa0
> Modules linked in:
> ….
>
> Cc: Christoph Hellwig
> Cc: Dan Williams
> Cc: Sachin Sant
> Cc: linux-nvdimm@lists.01.org
> Cc: Ira Weiny
> Cc: Jason Gunthorpe
>
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commit 6f42193fd86e ("memremap: don't use a separate devm action for
devmap_managed_enable_get") changed the static key updates such that we
now call devmap_managed_enable_put() without doing the equivalent
devmap_managed_enable_get().
devmap_managed_enable_get() is only called for
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