linux-kernel - [PATCH 1/3] x86/paravirt: Drop pv_cpu

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Message-Id: <20180119121821.77018-2-kirill.shutemov@linux.intel.com>
Date:   Fri, 19 Jan 2018 15:18:19 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 1/3] x86/paravirt: Drop pv_cpu_ops::wbinvd()

lguest was the last user of non-native pv_cpu_ops::wbinvd()
implementation. lguest has gone and we can drop support of the
operation.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/x86/include/asm/paravirt.h       | 5 -----
 arch/x86/include/asm/paravirt_types.h | 1 -
 arch/x86/include/asm/special_insns.h  | 7 +------
 arch/x86/kernel/paravirt.c            | 1 -
 arch/x86/kernel/paravirt_patch_64.c   | 2 --
 arch/x86/xen/enlighten_pv.c           | 2 --
 6 files changed, 1 insertion(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 892df375b615..4d6bd43733f9 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -98,11 +98,6 @@ static inline void halt(void)
 	PVOP_VCALL0(pv_irq_ops.halt);
 }
 
-static inline void wbinvd(void)
-{
-	PVOP_VCALL0(pv_cpu_ops.wbinvd);
-}
-
 #define get_kernel_rpl()  (pv_info.kernel_rpl)
 
 static inline u64 paravirt_read_msr(unsigned msr)
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 6ec54d01972d..1d003607dd1c 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -138,7 +138,6 @@ struct pv_cpu_ops {
 
 	void (*set_iopl_mask)(unsigned mask);
 
-	void (*wbinvd)(void);
 	void (*io_delay)(void);
 
 	/* cpuid emulation, mostly so that caps bits can be disabled */
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
index 317fc59b512c..0d9c28a7833d 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -129,7 +129,7 @@ static inline void __write_pkru(u32 pkru)
 }
 #endif
 
-static inline void native_wbinvd(void)
+static inline void wbinvd(void)
 {
 	asm volatile("wbinvd": : :"memory");
 }
@@ -184,11 +184,6 @@ static inline void __write_cr4(unsigned long x)
 	native_write_cr4(x);
 }
 
-static inline void wbinvd(void)
-{
-	native_wbinvd();
-}
-
 #ifdef CONFIG_X86_64
 
 static inline unsigned long read_cr8(void)
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 041096bdef86..5ce5bf145e36 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -342,7 +342,6 @@ __visible struct pv_cpu_ops pv_cpu_ops = {
 	.read_cr8 = native_read_cr8,
 	.write_cr8 = native_write_cr8,
 #endif
-	.wbinvd = native_wbinvd,
 	.read_msr = native_read_msr,
 	.write_msr = native_write_msr,
 	.read_msr_safe = native_read_msr_safe,
diff --git a/arch/x86/kernel/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch_64.c
index 9edadabf04f6..ee81ce4593d4 100644
--- a/arch/x86/kernel/paravirt_patch_64.c
+++ b/arch/x86/kernel/paravirt_patch_64.c
@@ -10,7 +10,6 @@ DEF_NATIVE(pv_irq_ops, save_fl, "pushfq; popq %rax");
 DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
 DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
 DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
-DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");
 
 DEF_NATIVE(pv_cpu_ops, usergs_sysret64, "swapgs; sysretq");
 DEF_NATIVE(pv_cpu_ops, swapgs, "swapgs");
@@ -59,7 +58,6 @@ unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
 		PATCH_SITE(pv_mmu_ops, read_cr2);
 		PATCH_SITE(pv_mmu_ops, read_cr3);
 		PATCH_SITE(pv_mmu_ops, write_cr3);
-		PATCH_SITE(pv_cpu_ops, wbinvd);
 #if defined(CONFIG_PARAVIRT_SPINLOCKS)
 		case PARAVIRT_PATCH(pv_lock_ops.queued_spin_unlock):
 			if (pv_is_native_spin_unlock()) {
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index c047f42552e1..5ea6bb0bd3e5 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -1055,8 +1055,6 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
 	.write_cr8 = xen_write_cr8,
 #endif
 
-	.wbinvd = native_wbinvd,
-
 	.read_msr = xen_read_msr,
 	.write_msr = xen_write_msr,
 
-- 
2.15.1