[tip:x86/paravirt] x86/paravirt: Move the pv_irq_ops under the PARAVIRT_XXL umbrella

From: tip-bot for Juergen Gross
Date: Mon Sep 03 2018 - 11:01:52 EST

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Commit-ID: 6da63eb241a05b0e676d68975e793c0521387141
Gitweb: https://git.kernel.org/tip/6da63eb241a05b0e676d68975e793c0521387141
Author: Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Tue, 28 Aug 2018 09:40:24 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 3 Sep 2018 16:50:36 +0200

x86/paravirt: Move the pv_irq_ops under the PARAVIRT_XXL umbrella

All of the paravirt ops defined in pv_irq_ops are for Xen PV guests
or VSMP only. Define them only if CONFIG_PARAVIRT_XXL is set.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: akataria@xxxxxxxxxx
Cc: rusty@xxxxxxxxxxxxxxx
Cc: boris.ostrovsky@xxxxxxxxxx
Cc: hpa@xxxxxxxxx
Link: https://lkml.kernel.org/r/20180828074026.820-14-jgross@xxxxxxxx

---
arch/x86/include/asm/irqflags.h | 8 +-------
arch/x86/include/asm/paravirt.h | 6 +++---
arch/x86/include/asm/paravirt_types.h | 3 ++-
arch/x86/kernel/asm-offsets.c | 2 +-
arch/x86/kernel/asm-offsets_64.c | 2 +-
arch/x86/kernel/paravirt.c | 2 +-
arch/x86/kernel/paravirt_patch_32.c | 4 ++--
arch/x86/kernel/paravirt_patch_64.c | 4 +++-
arch/x86/kernel/vsmp_64.c | 2 +-
9 files changed, 15 insertions(+), 18 deletions(-)

diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h
index 025a1986170c..058e40fed167 100644
--- a/arch/x86/include/asm/irqflags.h
+++ b/arch/x86/include/asm/irqflags.h
@@ -64,7 +64,7 @@ static inline __cpuidle void native_halt(void)

#endif

-#ifdef CONFIG_PARAVIRT
+#ifdef CONFIG_PARAVIRT_XXL
#include <asm/paravirt.h>
#else
#ifndef __ASSEMBLY__
@@ -126,13 +126,7 @@ static inline notrace unsigned long arch_local_irq_save(void)
#ifdef CONFIG_DEBUG_ENTRY
#define SAVE_FLAGS(x) pushfq; popq %rax
#endif
-#endif
-#endif /* __ASSEMBLY__ */
-#endif /* CONFIG_PARAVIRT */

-#ifndef CONFIG_PARAVIRT_XXL
-#ifdef __ASSEMBLY__
-#ifdef CONFIG_X86_64
#define SWAPGS swapgs
/*
* Currently paravirt can't handle swapgs nicely when we
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 686a68004b5f..512433c56c33 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -91,7 +91,6 @@ static inline void write_cr8(unsigned long x)
PVOP_VCALL1(cpu.write_cr8, x);
}
#endif
-#endif

static inline void arch_safe_halt(void)
{
@@ -103,7 +102,6 @@ static inline void halt(void)
PVOP_VCALL0(irq.halt);
}

-#ifdef CONFIG_PARAVIRT_XXL
static inline void wbinvd(void)
{
PVOP_VCALL0(cpu.wbinvd);
@@ -770,6 +768,7 @@ bool __raw_callee_save___native_vcpu_is_preempted(long cpu);
#define __PV_IS_CALLEE_SAVE(func) \
((struct paravirt_callee_save) { func })

+#ifdef CONFIG_PARAVIRT_XXL
static inline notrace unsigned long arch_local_save_flags(void)
{
return PVOP_CALLEE0(unsigned long, irq.save_fl);
@@ -798,6 +797,7 @@ static inline notrace unsigned long arch_local_irq_save(void)
arch_local_irq_disable();
return f;
}
+#endif

/* Make sure as little as possible of this mess escapes. */
@@ -884,7 +884,6 @@ extern void default_banner(void);
PARA_SITE(PARA_PATCH(PV_CPU_iret), \
ANNOTATE_RETPOLINE_SAFE; \
jmp PARA_INDIRECT(pv_ops+PV_CPU_iret);)
-#endif

#define DISABLE_INTERRUPTS(clobbers) \
PARA_SITE(PARA_PATCH(PV_IRQ_irq_disable), \
@@ -899,6 +898,7 @@ extern void default_banner(void);
ANNOTATE_RETPOLINE_SAFE; \
call PARA_INDIRECT(pv_ops+PV_IRQ_irq_enable); \
PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
+#endif

#ifdef CONFIG_X86_64
#ifdef CONFIG_PARAVIRT_XXL
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index ad87379b2332..f582093b52dd 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -184,6 +184,7 @@ struct pv_cpu_ops {
} __no_randomize_layout;

struct pv_irq_ops {
+#ifdef CONFIG_PARAVIRT_XXL
/*
* Get/set interrupt state. save_fl and restore_fl are only
* expected to use X86_EFLAGS_IF; all other bits
@@ -200,7 +201,7 @@ struct pv_irq_ops {

void (*safe_halt)(void);
void (*halt)(void);
-
+#endif
} __no_randomize_layout;

struct pv_mmu_ops {
diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
index 0fe233d98d17..28e7572ff74d 100644
--- a/arch/x86/kernel/asm-offsets.c
+++ b/arch/x86/kernel/asm-offsets.c
@@ -66,9 +66,9 @@ void common(void) {

#ifdef CONFIG_PARAVIRT
BLANK();
+#ifdef CONFIG_PARAVIRT_XXL
OFFSET(PV_IRQ_irq_disable, paravirt_patch_template, irq.irq_disable);
OFFSET(PV_IRQ_irq_enable, paravirt_patch_template, irq.irq_enable);
-#ifdef CONFIG_PARAVIRT_XXL
OFFSET(PV_CPU_iret, paravirt_patch_template, cpu.iret);
#endif
OFFSET(PV_MMU_read_cr2, paravirt_patch_template, mmu.read_cr2);
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
index 2a15d420a84d..ddced33184b5 100644
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -25,9 +25,9 @@ int main(void)
OFFSET(PV_CPU_usergs_sysret64, paravirt_patch_template,
cpu.usergs_sysret64);
OFFSET(PV_CPU_swapgs, paravirt_patch_template, cpu.swapgs);
-#endif
#ifdef CONFIG_DEBUG_ENTRY
OFFSET(PV_IRQ_save_fl, paravirt_patch_template, irq.save_fl);
+#endif
#endif
BLANK();
#endif
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 1d5f40cc872a..5e8226335eac 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -373,7 +373,6 @@ struct paravirt_patch_template pv_ops = {

.cpu.start_context_switch = paravirt_nop,
.cpu.end_context_switch = paravirt_nop,
-#endif /* CONFIG_PARAVIRT_XXL */

/* Irq ops. */
.irq.save_fl = __PV_IS_CALLEE_SAVE(native_save_fl),
@@ -382,6 +381,7 @@ struct paravirt_patch_template pv_ops = {
.irq.irq_enable = __PV_IS_CALLEE_SAVE(native_irq_enable),
.irq.safe_halt = native_safe_halt,
.irq.halt = native_halt,
+#endif /* CONFIG_PARAVIRT_XXL */

/* Mmu ops. */
.mmu.read_cr2 = native_read_cr2,
diff --git a/arch/x86/kernel/paravirt_patch_32.c b/arch/x86/kernel/paravirt_patch_32.c
index 5a20aa56efc0..1d44705c6528 100644
--- a/arch/x86/kernel/paravirt_patch_32.c
+++ b/arch/x86/kernel/paravirt_patch_32.c
@@ -1,11 +1,11 @@
// SPDX-License-Identifier: GPL-2.0
#include <asm/paravirt.h>

+#ifdef CONFIG_PARAVIRT_XXL
DEF_NATIVE(irq, irq_disable, "cli");
DEF_NATIVE(irq, irq_enable, "sti");
DEF_NATIVE(irq, restore_fl, "push %eax; popf");
DEF_NATIVE(irq, save_fl, "pushf; pop %eax");
-#ifdef CONFIG_PARAVIRT_XXL
DEF_NATIVE(cpu, iret, "iret");
#endif
DEF_NATIVE(mmu, read_cr2, "mov %cr2, %eax");
@@ -43,11 +43,11 @@ unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
end = end_##ops##_##x; \
goto patch_site
switch (type) {
+#ifdef CONFIG_PARAVIRT_XXL
PATCH_SITE(irq, irq_disable);
PATCH_SITE(irq, irq_enable);
PATCH_SITE(irq, restore_fl);
PATCH_SITE(irq, save_fl);
-#ifdef CONFIG_PARAVIRT_XXL
PATCH_SITE(cpu, iret);
#endif
PATCH_SITE(mmu, read_cr2);
diff --git a/arch/x86/kernel/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch_64.c
index 461aba038ada..b00937963a0f 100644
--- a/arch/x86/kernel/paravirt_patch_64.c
+++ b/arch/x86/kernel/paravirt_patch_64.c
@@ -3,10 +3,12 @@
#include <asm/asm-offsets.h>
#include <linux/stringify.h>

+#ifdef CONFIG_PARAVIRT_XXL
DEF_NATIVE(irq, irq_disable, "cli");
DEF_NATIVE(irq, irq_enable, "sti");
DEF_NATIVE(irq, restore_fl, "pushq %rdi; popfq");
DEF_NATIVE(irq, save_fl, "pushfq; popq %rax");
+#endif
DEF_NATIVE(mmu, read_cr2, "movq %cr2, %rax");
DEF_NATIVE(mmu, read_cr3, "movq %cr3, %rax");
DEF_NATIVE(mmu, write_cr3, "movq %rdi, %cr3");
@@ -51,11 +53,11 @@ unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
end = end_##ops##_##x; \
goto patch_site
switch(type) {
+#ifdef CONFIG_PARAVIRT_XXL
PATCH_SITE(irq, restore_fl);
PATCH_SITE(irq, save_fl);
PATCH_SITE(irq, irq_enable);
PATCH_SITE(irq, irq_disable);
-#ifdef CONFIG_PARAVIRT_XXL
PATCH_SITE(cpu, usergs_sysret64);
PATCH_SITE(cpu, swapgs);
PATCH_SITE(cpu, wbinvd);
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index 789918d78697..1eae5af491c2 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -26,7 +26,7 @@

#define TOPOLOGY_REGISTER_OFFSET 0x10

-#if defined CONFIG_PCI && defined CONFIG_PARAVIRT
+#if defined CONFIG_PCI && defined CONFIG_PARAVIRT_XXL
/*
* Interrupt control on vSMPowered systems:
* ~AC is a shadow of IF. If IF is 'on' AC should be 'off'

Next message: Andy Shevchenko: "Re: [PATCH v13 08/13] x86/sgx: Add wrappers for ENCLS leaf functions"
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Next in thread: Borislav Petkov: "Re: [tip:x86/paravirt] x86/paravirt: Move the pv_irq_ops under the PARAVIRT_XXL umbrella"
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