linux-kernel - [PATCH v1 2/2] arm64: handle NOTIFY_SEI notification by the APEI driver

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Date:   Thu, 31 May 2018 20:41:46 +0800
From:   Dongjiu Geng <gengdongjiu@...wei.com>
To:     <catalin.marinas@....com>, <will.deacon@....com>,
        <rjw@...ysocki.net>, <lenb@...nel.org>, <tony.luck@...el.com>,
        <bp@...en8.de>, <robert.moore@...el.com>,
        <erik.schmauss@...el.com>, <mark.rutland@....com>,
        <dave.martin@....com>, <ard.biesheuvel@...aro.org>,
        <james.morse@....com>, <gengdongjiu@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>
Subject: [PATCH v1 2/2] arm64: handle NOTIFY_SEI notification by the APEI driver

When kernel or KVM gets the NOTIFY_SEI notification, it firstly
calls the APEI driver to handle this notification.

Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
---
 arch/arm64/kernel/traps.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
---
change since https://www.spinics.net/lists/kvm/msg168919.html

1. Remove the handle_guest_sei() helper


diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 8bbdc17..676e40c 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -50,6 +50,7 @@
 #include <asm/exception.h>
 #include <asm/system_misc.h>
 #include <asm/sysreg.h>
+#include <acpi/ghes.h>
 
 static const char *handler[]= {
 	"Synchronous Abort",
@@ -701,6 +702,20 @@ void __noreturn arm64_serror_panic(struct pt_regs *regs, u32 esr)
 bool arm64_is_fatal_ras_serror(struct pt_regs *regs, unsigned int esr)
 {
 	u32 aet = arm64_ras_serror_get_severity(esr);
+	int ret = -ENOENT;
+
+	if (IS_ENABLED(CONFIG_ACPI_APEI_SEI)) {
+		if (interrupts_enabled(regs))
+			nmi_enter();
+
+		ret = ghes_notify_sei();
+
+		if (interrupts_enabled(regs))
+			nmi_exit();
+
+		if (!ret)
+			return false;
+	}
 
 	switch (aet) {
 	case ESR_ELx_AET_CE:	/* corrected error */
-- 
1.9.1