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Message-ID: <20230112143825.704223863@infradead.org>
Date: Thu, 12 Jan 2023 15:31:44 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: x86@...nel.org, Joan Bruguera <joanbrugueram@...il.com>
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org,
Juergen Gross <jgross@...e.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
xen-devel <xen-devel@...ts.xenproject.org>,
Jan Beulich <jbeulich@...e.com>,
Roger Pau Monne <roger.pau@...rix.com>,
Kees Cook <keescook@...omium.org>, mark.rutland@....com
Subject: [RFC][PATCH 3/6] x86/callthunk: No callthunk for restore_processor_state()
From: Joan Bruguera <joanbrugueram@...il.com>
When resuming from suspend we don't have coherent CPU state, trying to
do callthunks here isn't going to work. Specifically GS isn't set yet.
Signed-off-by: Joan Bruguera <joanbrugueram@...il.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20230109040531.7888-1-joanbrugueram@gmail.com
---
arch/x86/kernel/callthunks.c | 5 +++++
arch/x86/power/cpu.c | 3 +++
2 files changed, 8 insertions(+)
--- a/arch/x86/kernel/callthunks.c
+++ b/arch/x86/kernel/callthunks.c
@@ -7,6 +7,7 @@
#include <linux/memory.h>
#include <linux/moduleloader.h>
#include <linux/static_call.h>
+#include <linux/suspend.h>
#include <asm/alternative.h>
#include <asm/asm-offsets.h>
@@ -151,6 +152,10 @@ static bool skip_addr(void *dest)
dest < (void*)hypercall_page + PAGE_SIZE)
return true;
#endif
+#ifdef CONFIG_PM_SLEEP
+ if (dest == restore_processor_state)
+ return true;
+#endif
return false;
}
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