[PATCH] x86/sgx: handle VA page allocation failure for EAUG on PF.

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Return VM_FAULT_NOPAGE to allow the swapping thread to catch up.

link: https://lore.kernel.org/all/20220804201456.33418-1-vijay.dhanraj@xxxxxxxxx/

Signed-off-by: Haitao Huang <haitao.huang@xxxxxxxxxxxxxxx>
---
 arch/x86/kernel/cpu/sgx/encl.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c
index 24c1bb8eb196..de92c1c8b79d 100644
--- a/arch/x86/kernel/cpu/sgx/encl.c
+++ b/arch/x86/kernel/cpu/sgx/encl.c
@@ -344,8 +344,11 @@ static vm_fault_t sgx_encl_eaug_page(struct vm_area_struct *vma,
 	}
 
 	va_page = sgx_encl_grow(encl, false);
-	if (IS_ERR(va_page))
+	if (IS_ERR(va_page)) {
+		if (PTR_ERR(va_page) == -EBUSY)
+			vmret =  VM_FAULT_NOPAGE;
 		goto err_out_epc;
+	}
 
 	if (va_page)
 		list_add(&va_page->list, &encl->va_pages);
-- 
2.25.1




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