Re: [PATCH v33 09/21] x86/sgx: Add __sgx_alloc_epc_page() and sgx_free_epc_page()

[Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>]

On Thu, Jun 25, 2020 at 07:06:48PM +0200, Borislav Petkov wrote:
> On Thu, Jun 18, 2020 at 01:08:31AM +0300, Jarkko Sakkinen wrote:
> > Add __sgx_alloc_epc_page(), which iterates through EPC sections and borrows
> > a page structure that is not used by anyone else. When a page is no longer
> > needed it must be released with sgx_free_epc_page(). This function
> > implicitly calls ENCLS[EREMOVE], which will return the page to the
> > uninitialized state (i.e. not required from caller part).
> > 
> > Acked-by: Jethro Beekman <jethro@xxxxxxxxxxxx>
> > Co-developed-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
> > ---
> >  arch/x86/kernel/cpu/sgx/main.c | 61 ++++++++++++++++++++++++++++++++++
> >  arch/x86/kernel/cpu/sgx/sgx.h  |  3 ++
> >  2 files changed, 64 insertions(+)
> > 
> > diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
> > index c5831e3db14a..b776d249289f 100644
> > --- a/arch/x86/kernel/cpu/sgx/main.c
> > +++ b/arch/x86/kernel/cpu/sgx/main.c
> > @@ -83,6 +83,67 @@ static bool __init sgx_page_reclaimer_init(void)
> >  	return true;
> >  }
> >  
> > +static struct sgx_epc_page *__sgx_alloc_epc_page_from_section(struct sgx_epc_section *section)
> > +{
> > +	struct sgx_epc_page *page;
> > +
> > +	if (list_empty(&section->page_list))
> > +		return NULL;
> > +
> > +	page = list_first_entry(&section->page_list, struct sgx_epc_page, list);
> > +	list_del_init(&page->list);
> 
> <---- newline here.
> 
> > +	return page;
> > +}
> 
> Otherwise looks good; nice comments.

Thanks!

> 
> Thx.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette

/Jarko