On 02/16/2018 10:25 AM, Nadav Amit wrote:
>> --- a/arch/x86/mm/pageattr.c~kpti-no-global-for-kernel-mappings
>> 2018-02-13 15:17:56.148210060 -0800
>> +++ b/arch/x86/mm/pageattr.c 2018-02-13 15:17:56.153210060 -0800
>> @@ -593,7 +593,8 @@ try_preserve_large_page(pte_t *kpte, uns
>> * di
On 02/16/2018 11:54 AM, Nadav Amit wrote:
>> But I don't really want to hide that gunk in a macro like that. It
>> might make more sense as a static inline. I'll give that a shot and resent.
> Since determining whether PTI is on is done in several places in the kernel,
> maybe there should a sing
Dave Hansen wrote:
> On 02/16/2018 10:25 AM, Nadav Amit wrote:
>>> +#ifdef CONFIG_PAGE_TABLE_ISOLATION
>>> +#define __PAGE_KERNEL_GLOBAL 0
>>> +#else
>>> +#define __PAGE_KERNEL_GLOBAL _PAGE_GLOBAL
>>> +#endif
>> ...
>>> --- a/arch/x86/mm/pageattr.c~kpti-no-global-for-k
On 02/16/2018 10:25 AM, Nadav Amit wrote:
>> +#ifdef CONFIG_PAGE_TABLE_ISOLATION
>> +#define __PAGE_KERNEL_GLOBAL0
>> +#else
>> +#define __PAGE_KERNEL_GLOBAL_PAGE_GLOBAL
>> +#endif
> ...
>> --- a/arch/x86/mm/pageattr.c~kpti-no-global-for-kernel-mappings
>> 2018
Dave Hansen wrote:
> On 02/16/2018 09:47 AM, Nadav Amit wrote:
>>> But, this also means that we now get *no* opportunity to use
>>> global pages with PTI, even for data which is shared such as the
>>> cpu_entry_area and entry/exit text.
>>
>> Doesn’t this patch change the kernel behavior when th
On 02/16/2018 09:47 AM, Nadav Amit wrote:
>> But, this also means that we now get *no* opportunity to use
>> global pages with PTI, even for data which is shared such as the
>> cpu_entry_area and entry/exit text.
>
> Doesn’t this patch change the kernel behavior when the “nopti”
> parameter is use
Dave Hansen wrote:
>
> From: Dave Hansen
>
> Kernel mappings are historically _PAGE_GLOBAL. But, with PTI, we do not
> want them to be _PAGE_GLOBAL. We currently accomplish this by simply
> clearing _PAGE_GLOBAL from the suppotred mask which ensures it is
> cleansed from many of our PTE cons
From: Dave Hansen
Kernel mappings are historically _PAGE_GLOBAL. But, with PTI, we do not
want them to be _PAGE_GLOBAL. We currently accomplish this by simply
clearing _PAGE_GLOBAL from the suppotred mask which ensures it is
cleansed from many of our PTE construction sites:
if (!stati
From: Dave Hansen
Kernel mappings are historically _PAGE_GLOBAL. But, with PTI, we do not
want them to be _PAGE_GLOBAL. We currently accomplish this by simply
clearing _PAGE_GLOBAL from the suppotred mask which ensures it is
cleansed from many of our PTE construction sites:
if (!stati
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