On Thu, 2024-08-29 at 10:38 +0800, Aaron Lu wrote:
> When current node doesn't have a EPC section configured by firmware and
> all other EPC sections memory are used up, CPU can stuck inside the
> while loop in __sgx_alloc_epc_page() forever and soft lockup will happen.
> Note how nid_of_current will never equal to nid in that while loop because
> nid_of_current is not set in sgx_numa_mask.
>
> Also worth mentioning is that it's perfectly fine for firmware to not
> seup an EPC section on a node. Setting an EPC section on each node can
seup -> set up.
> be good for performance but that's not a requirement functionality wise.
>
> Fixes: 901ddbb9ecf5 ("x86/sgx: Add a basic NUMA allocation scheme to sgx_alloc_epc_page()")
> Reported-by: Zhimin Luo <zhimin.luo@xxxxxxxxx>
> Tested-by: Zhimin Luo <zhimin.luo@xxxxxxxxx>
> Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
Reviewed-by: Kai Huang <kai.huang@xxxxxxxxx>
