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From:   Lai Jiangshan <jiangshanlai@gmail.com>
To:     linux-kernel@vger.kernel.org
Cc:     Lai Jiangshan <laijs@linux.alibaba.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Sean Christopherson <seanjc@google.com>,
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        Andy Lutomirski <luto@kernel.org>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>, kvm@vger.kernel.org,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Uros Bizjak <ubizjak@gmail.com>,
        Maxim Levitsky <mlevitsk@redhat.com>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
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        Juergen Gross <jgross@suse.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Alexandre Chartre <alexandre.chartre@oracle.com>,
        Joerg Roedel <jroedel@suse.de>, Jian Cai <caij2003@gmail.com>,
        xen-devel@lists.xenproject.org
Subject: [PATCH 1/4] x86/xen/entry: Rename xenpv_exc_nmi to noist_exc_nmi
Date:   Tue, 27 Apr 2021 07:09:46 +0800
Message-Id: <20210426230949.3561-2-jiangshanlai@gmail.com>
In-Reply-To: <20210426230949.3561-1-jiangshanlai@gmail.com>
References: <20210426230949.3561-1-jiangshanlai@gmail.com>
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From: Lai Jiangshan <laijs@linux.alibaba.com>

There is no any functionality change intended.  Just rename it and
move it to arch/x86/kernel/nmi.c so that we can resue it later in
next patch for early NMI and kvm.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Wanpeng Li <wanpengli@tencent.com>
Cc: Jim Mattson <jmattson@google.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: kvm@vger.kernel.org
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Uros Bizjak <ubizjak@gmail.com>
Cc: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
---
 arch/x86/include/asm/idtentry.h | 2 +-
 arch/x86/kernel/nmi.c           | 8 ++++++++
 arch/x86/xen/enlighten_pv.c     | 9 +++------
 arch/x86/xen/xen-asm.S          | 2 +-
 4 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index e35e342673c7..5b11d2ddbb5c 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -590,7 +590,7 @@ DECLARE_IDTENTRY_RAW(X86_TRAP_MC,	xenpv_exc_machine_check);
 /* NMI */
 DECLARE_IDTENTRY_NMI(X86_TRAP_NMI,	exc_nmi);
 #ifdef CONFIG_XEN_PV
-DECLARE_IDTENTRY_RAW(X86_TRAP_NMI,	xenpv_exc_nmi);
+DECLARE_IDTENTRY_RAW(X86_TRAP_NMI,	noist_exc_nmi);
 #endif
 
 /* #DB */
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index bf250a339655..2b907a76d0a1 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -524,6 +524,14 @@ DEFINE_IDTENTRY_RAW(exc_nmi)
 		mds_user_clear_cpu_buffers();
 }
 
+#ifdef CONFIG_XEN_PV
+DEFINE_IDTENTRY_RAW(noist_exc_nmi)
+{
+	/* On Xen PV, NMI doesn't use IST.  The C part is the same as native. */
+	exc_nmi(regs);
+}
+#endif
+
 void stop_nmi(void)
 {
 	ignore_nmis++;
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 4f18cd9eacd8..5efbdb0905b7 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -565,12 +565,6 @@ static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
 
 void noist_exc_debug(struct pt_regs *regs);
 
-DEFINE_IDTENTRY_RAW(xenpv_exc_nmi)
-{
-	/* On Xen PV, NMI doesn't use IST.  The C part is the same as native. */
-	exc_nmi(regs);
-}
-
 DEFINE_IDTENTRY_RAW_ERRORCODE(xenpv_exc_double_fault)
 {
 	/* On Xen PV, DF doesn't use IST.  The C part is the same as native. */
@@ -626,6 +620,9 @@ struct trap_array_entry {
 	.xen		= xen_asm_xenpv_##func,		\
 	.ist_okay	= ist_ok }
 
+/* Alias to make TRAP_ENTRY_REDIR() happy for nmi */
+#define xen_asm_xenpv_exc_nmi	xen_asm_noist_exc_nmi
+
 static struct trap_array_entry trap_array[] = {
 	TRAP_ENTRY_REDIR(exc_debug,			true  ),
 	TRAP_ENTRY_REDIR(exc_double_fault,		true  ),
diff --git a/arch/x86/xen/xen-asm.S b/arch/x86/xen/xen-asm.S
index 1e626444712b..12e7cbbb2a8d 100644
--- a/arch/x86/xen/xen-asm.S
+++ b/arch/x86/xen/xen-asm.S
@@ -130,7 +130,7 @@ _ASM_NOKPROBE(xen_\name)
 xen_pv_trap asm_exc_divide_error
 xen_pv_trap asm_xenpv_exc_debug
 xen_pv_trap asm_exc_int3
-xen_pv_trap asm_xenpv_exc_nmi
+xen_pv_trap asm_noist_exc_nmi
 xen_pv_trap asm_exc_overflow
 xen_pv_trap asm_exc_bounds
 xen_pv_trap asm_exc_invalid_op
-- 
2.19.1.6.gb485710b