linux-kernel - [PATCH v6 35/76] x86/head/64: Make fixup

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Date:   Mon, 24 Aug 2020 10:54:30 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     x86@...nel.org
Cc:     Joerg Roedel <joro@...tes.org>, Joerg Roedel <jroedel@...e.de>,
        Kees Cook <keescook@...omium.org>, hpa@...or.com,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        David Rientjes <rientjes@...gle.com>,
        Cfir Cohen <cfir@...gle.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mike Stunes <mstunes@...are.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Martin Radev <martin.b.radev@...il.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: [PATCH v6 35/76] x86/head/64: Make fixup_pointer() static inline

From: Joerg Roedel <jroedel@...e.de>

Also move it to a header file so that it can be used in the idt code
to setup the early IDT.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
Reviewed-by: Kees Cook <keescook@...omium.org>
Link: https://lore.kernel.org/r/20200724160336.5435-35-joro@8bytes.org
---
 arch/x86/include/asm/setup.h | 10 ++++++++++
 arch/x86/kernel/head64.c     |  5 -----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 5c2fd05bd52c..8aa6ba0427b0 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -74,6 +74,16 @@ static inline void x86_ce4100_early_setup(void) { }
 extern struct boot_params boot_params;
 extern char _text[];
 
+/*
+ * This function is used in C code that runs while the kernel still runs on
+ * identity mapped addresses to get the correct address of kernel pointers in
+ * the identity mapping.
+ */
+static __always_inline void *fixup_pointer(void *ptr, unsigned long physaddr)
+{
+	return ptr - (void *)_text + (void *)physaddr;
+}
+
 static inline bool kaslr_enabled(void)
 {
 	return IS_ENABLED(CONFIG_RANDOMIZE_MEMORY) &&
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index b0ab5627900b..8703292a35e9 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -82,11 +82,6 @@ static struct desc_ptr startup_gdt_descr = {
 
 #define __head	__section(.head.text)
 
-static void __head *fixup_pointer(void *ptr, unsigned long physaddr)
-{
-	return ptr - (void *)_text + (void *)physaddr;
-}
-
 static unsigned long __head *fixup_long(void *ptr, unsigned long physaddr)
 {
 	return fixup_pointer(ptr, physaddr);
-- 
2.28.0