linux-kernel - [PATCH 3/4] x86/sgx: Hook sgx_memory

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Date:   Thu,  8 Jul 2021 11:14:22 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     tony.luck@...el.com
Cc:     Jarkko Sakkinen <jarkko@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        linux-sgx@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/4] x86/sgx: Hook sgx_memory_failure() into mainline code

Add a call inside memory_failure() to check if the address is an SGX
EPC page and handle it.

Note the SGX EPC pages do not have a "struct page" entry, so the hook
goes in at the same point as the device mapping hook.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 include/linux/mm.h  | 9 +++++++++
 mm/memory-failure.c | 4 ++++
 2 files changed, 13 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8ae31622deef..1b9d0912942a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -3251,5 +3251,14 @@ static inline int seal_check_future_write(int seals, struct vm_area_struct *vma)
 	return 0;
 }
 
+#ifdef CONFIG_X86_SGX
+int sgx_memory_failure(unsigned long pfn, int flags);
+#else
+static inline int sgx_memory_failure(unsigned long pfn, int flags)
+{
+	return -ENXIO;
+}
+#endif
+
 #endif /* __KERNEL__ */
 #endif /* _LINUX_MM_H */
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 6f5f78885ab4..02b1c58729c1 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1453,6 +1453,10 @@ int memory_failure(unsigned long pfn, int flags)
 
 	p = pfn_to_online_page(pfn);
 	if (!p) {
+		res = sgx_memory_failure(pfn, flags);
+		if (res == 0)
+			return 0;
+
 		if (pfn_valid(pfn)) {
 			pgmap = get_dev_pagemap(pfn, NULL);
 			if (pgmap)
-- 
2.29.2