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Message-Id: <20230801083318.8363-12-xin3.li@intel.com>
Date: Tue, 1 Aug 2023 01:32:53 -0700
From: Xin Li <xin3.li@...el.com>
To: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-edac@...r.kernel.org, linux-hyperv@...r.kernel.org,
kvm@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc: Jonathan Corbet <corbet@....net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H . Peter Anvin" <hpa@...or.com>,
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"K . Y . Srinivasan" <kys@...rosoft.com>,
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Subject: [PATCH RESEND v9 11/36] x86/fred: Reserve space for the FRED stack frame
From: "H. Peter Anvin (Intel)" <hpa@...or.com>
When using FRED, reserve space at the top of the stack frame, just
like i386 does.
Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
Tested-by: Shan Kang <shan.kang@...el.com>
Signed-off-by: Xin Li <xin3.li@...el.com>
---
arch/x86/include/asm/thread_info.h | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h
index d63b02940747..089cab875cba 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -31,7 +31,9 @@
* In vm86 mode, the hardware frame is much longer still, so add 16
* bytes to make room for the real-mode segments.
*
- * x86_64 has a fixed-length stack frame.
+ * x86-64 has a fixed-length stack frame, but it depends on whether
+ * or not FRED is enabled. Future versions of FRED might make this
+ * dynamic, but for now it is always 2 words longer.
*/
#ifdef CONFIG_X86_32
# ifdef CONFIG_VM86
@@ -39,8 +41,12 @@
# else
# define TOP_OF_KERNEL_STACK_PADDING 8
# endif
-#else
-# define TOP_OF_KERNEL_STACK_PADDING 0
+#else /* x86-64 */
+# ifdef CONFIG_X86_FRED
+# define TOP_OF_KERNEL_STACK_PADDING (2*8)
+# else
+# define TOP_OF_KERNEL_STACK_PADDING 0
+# endif
#endif
/*
--
2.34.1
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