Re: [PATCH v4 0/8] x86: Meltdown band-aid overhead reduction

Re: [PATCH v4 0/8] x86: Meltdown band-aid overhead reduction

[Juergen Gross]

On 19/03/18 14:32, Jan Beulich wrote:
> 1: NOP out most XPTI entry/exit code when it's not in use
> 2: disable XPTI when RDCL_NO
> 3: x86: log XPTI enabled status
> 4: use %r12 to write zero into xen_cr3
> 5: reduce .text.entry
> 6: enable interrupts earlier with XPTI disabled
> 7: also NOP out xen_cr3 restores of XPTI
> 8: avoid double CR3 reload when switching to guest user mode
> 
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
> ---
> v4: Main change is the split of patch 1.

Andrew, any chance you could review patches 1 and 5-8 in order to
unblock this series and mine?


Juergen


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[PATCH v4 0/8] x86: Meltdown band-aid overhead reduction

[Jan Beulich]

1: NOP out most XPTI entry/exit code when it's not in use
2: disable XPTI when RDCL_NO
3: x86: log XPTI enabled status
4: use %r12 to write zero into xen_cr3
5: reduce .text.entry
6: enable interrupts earlier with XPTI disabled
7: also NOP out xen_cr3 restores of XPTI
8: avoid double CR3 reload when switching to guest user mode

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
v4: Main change is the split of patch 1.


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