On 11/01/2017 02:01 PM, Thomas Gleixner wrote:
> On Tue, 31 Oct 2017, Dave Hansen wrote:
>>
>> +pushq %rdi
>> +SWITCH_TO_KERNEL_CR3 scratch_reg=%rdi
>> +popq%rdi
>
> Can you please have a macro variant which does:
>
> SWITCH_TO_KERNEL_CR3_PUSH reg=%rdi
>
> So the pushq/po
On Tue, 31 Oct 2017, Dave Hansen wrote:
>
> + pushq %rdi
> + SWITCH_TO_KERNEL_CR3 scratch_reg=%rdi
> + popq%rdi
Can you please have a macro variant which does:
SWITCH_TO_KERNEL_CR3_PUSH reg=%rdi
So the pushq/popq is inside the macro. This has two reasons:
1) If KAISER
On Wed, Nov 01, 2017 at 11:27:48AM -0700, Dave Hansen wrote:
> This allows for a tiny optimization of Andy's that I realize I must have
> blown away at some point. It lets us do a 32-bit-register instruction
> (and using %eXX) when checking KAISER_SWITCH_MASK instead of a 64-bit
> register via %rX
On 11/01/2017 11:18 AM, Borislav Petkov wrote:
>> +.macro SAVE_AND_SWITCH_TO_KERNEL_CR3 scratch_reg:req save_reg:req
>> +movq%cr3, %r\scratch_reg
>> +movq%r\scratch_reg, \save_reg
>
> So one of the args gets passed as "ax", for example, which then gets
> completed to a register wit
On Tue, Oct 31, 2017 at 03:31:48PM -0700, Dave Hansen wrote:
> diff -puN arch/x86/entry/calling.h~kaiser-luto-base-cr3-work
> arch/x86/entry/calling.h
> --- a/arch/x86/entry/calling.h~kaiser-luto-base-cr3-work 2017-10-31
> 15:03:48.105007253 -0700
> +++ b/arch/x86/entry/calling.h2017
On 10/31/2017 05:43 PM, Brian Gerst wrote:
>>
>> + RESTORE_CR3 save_reg=%r14
>> +
>> testl %ebx, %ebx /* swapgs needed? */
>> jnz nmi_restore
>> nmi_swapgs:
>> _
> This all needs to be conditional on a config option. Something with
> this amount of
On Tue, Oct 31, 2017 at 6:31 PM, Dave Hansen
wrote:
>
> This is largely code from Andy Lutomirski. I fixed a few bugs
> in it, and added a few SWITCH_TO_* spots.
>
> KAISER needs to switch to a different CR3 value when it enters
> the kernel and switch back when it exits. This essentially
> need
This is largely code from Andy Lutomirski. I fixed a few bugs
in it, and added a few SWITCH_TO_* spots.
KAISER needs to switch to a different CR3 value when it enters
the kernel and switch back when it exits. This essentially
needs to be done before we leave assembly code.
This is extra challe
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