linux-kernel - [tip:x86/urgent] x86/mm/64: Fix reboot interaction with CR4.PCIDE

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Date:   Mon, 9 Oct 2017 04:36:01 -0700
From:   tip-bot for Andy Lutomirski <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     bp@...en8.de, tglx@...utronix.de, linux-kernel@...r.kernel.org,
        mingo@...nel.org, hpa@...or.com, rostedt@...dmis.org,
        luto@...nel.org
Subject: [tip:x86/urgent] x86/mm/64: Fix reboot interaction with CR4.PCIDE

Commit-ID:  924c6b900cfdf376b07bccfd80e62b21914f8a5a
Gitweb:     https://git.kernel.org/tip/924c6b900cfdf376b07bccfd80e62b21914f8a5a
Author:     Andy Lutomirski <luto@...nel.org>
AuthorDate: Sun, 8 Oct 2017 21:53:05 -0700
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 9 Oct 2017 13:31:04 +0200

x86/mm/64: Fix reboot interaction with CR4.PCIDE

Trying to reboot via real mode fails with PCID on: long mode cannot
be exited while CR4.PCIDE is set.  (No, I have no idea why, but the
SDM and actual CPUs are in agreement here.)  The result is a GPF and
a hang instead of a reboot.

I didn't catch this in testing because neither my computer nor my VM
reboots this way.  I can trigger it with reboot=bios, though.

Fixes: 660da7c9228f ("x86/mm: Enable CR4.PCIDE on supported systems")
Reported-and-tested-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Andy Lutomirski <luto@...nel.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Borislav Petkov <bp@...en8.de>
Link: https://lkml.kernel.org/r/f1e7d965998018450a7a70c2823873686a8b21c0.1507524746.git.luto@kernel.org

---
 arch/x86/kernel/reboot.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 54180fa..add33f6 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -105,6 +105,10 @@ void __noreturn machine_real_restart(unsigned int type)
 	load_cr3(initial_page_table);
 #else
 	write_cr3(real_mode_header->trampoline_pgd);
+
+	/* Exiting long mode will fail if CR4.PCIDE is set. */
+	if (static_cpu_has(X86_FEATURE_PCID))
+		cr4_clear_bits(X86_CR4_PCIDE);
 #endif
 
 	/* Jump to the identity-mapped low memory code */