linux-kernel - [PATCH v11 7/7] x86/sgx: Add check for SGX pages to ghes_do_memory

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Message-Id: <20211026220050.697075-8-tony.luck@intel.com>
Date:   Tue, 26 Oct 2021 15:00:50 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>, x86@...nel.org
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        naoya.horiguchi@....com, Andrew Morton <akpm@...ux-foundation.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Cathy Zhang <cathy.zhang@...el.com>, linux-sgx@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>
Subject: [PATCH v11 7/7] x86/sgx: Add check for SGX pages to ghes_do_memory_failure()

SGX EPC pages do not have a "struct page" associated with them so the
pfn_valid() sanity check fails and results in a warning message to
the console.

Add an additional check to skip the warning if the address of the error
is in an SGX EPC page.

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>
Tested-by: Reinette Chatre <reinette.chatre@...el.com>
Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 drivers/acpi/apei/ghes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 0c8330ed1ffd..0c5c9acc6254 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -449,7 +449,7 @@ static bool ghes_do_memory_failure(u64 physical_addr, int flags)
 		return false;
 
 	pfn = PHYS_PFN(physical_addr);
-	if (!pfn_valid(pfn)) {
+	if (!pfn_valid(pfn) && !arch_is_platform_page(physical_addr)) {
 		pr_warn_ratelimited(FW_WARN GHES_PFX
 		"Invalid address in generic error data: %#llx\n",
 		physical_addr);
-- 
2.31.1