Re: [PATCH v5 1/3] x86/sgx: Repurpose the owner field as the virtual address of virtual EPC page

Kai Huang
2022-07-21T23:27:08Z

On Thu, 2022-07-21 at 09:42 -0700, Dave Hansen wrote:
> On 6/22/22 02:37, Zhiquan Li wrote:
> > diff --git a/arch/x86/kernel/cpu/sgx/virt.c b/arch/x86/kernel/cpu/sgx/virt.c
> > index 6a77a14eee38..776ae5c1c032 100644
> > --- a/arch/x86/kernel/cpu/sgx/virt.c
> > +++ b/arch/x86/kernel/cpu/sgx/virt.c
> > @@ -46,10 +46,12 @@ static int __sgx_vepc_fault(struct sgx_vepc *vepc,
> > if (epc_page)
> > return 0;
> >
> > - epc_page = sgx_alloc_epc_page(vepc, false);
> > + epc_page = sgx_alloc_epc_page((void *)addr, false);
> > if (IS_ERR(epc_page))
> > return PTR_ERR(epc_page);
>
> Was the 'vepc' value simply unused before?

Yes for EPC page assigned to KVM guest it was unused before this series.

--
Thanks,
-Kai