x86/mce Add validation check before GHES error is recorded

When GHES error record is logged into mcelog kernel buffer, a validation
check for physical address is necessary, which prevents reporting an
invalid physical address.

[Since physical address is the only useful element in this error record,
we drop generating the record completely if we don't have a valid address]

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/x86/kernel/cpu/mcheck/mce-apei.c

@@ -42,7 +42,8 @@ void apei_mce_report_mem_error(int corrected, struct cper_sec_mem_err *mem_err)
 	struct mce m;
 
 	/* Only corrected MC is reported */
-	if (!corrected)
+	if (!corrected || !(mem_err->validation_bits &
+				CPER_MEM_VALID_PHYSICAL_ADDRESS))
 		return;
 
 	mce_setup(&m);