On 11/12/21 16:50, Ira Weiny wrote:
On Tue, Aug 03, 2021 at 09:32:21PM -0700, 'Ira Weiny' wrote:
From: Ira Weiny <ira.weiny@xxxxxxxxx>
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 much more complicated and
was potentially fraught with unintended consequences.[2] However, Andy
came up with a way to hide additional values on the stack which could be
accessed as "extended_pt_regs".[3]
Andy,
I'm preparing to send V8 of this PKS work. But I have not seen any feed back
since I originally implemented this in V4[1].
Does this meets your expectations? Are there any issues you can see with this
code?
I think I'm generally okay with the approach to allocating space. All
of Thomas' comments still apply, though. (Sorry, I'm horribly behind.)
