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x86/paravirt: Move the Xen-only pv_cpu_ops under the PARAVIRT_XXL umbrella 

Most of the paravirt ops defined in pv_cpu_ops are for Xen PV guests
only. Define them only if CONFIG_PARAVIRT_XXL is set.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel@lists.xenproject.org
Cc: virtualization@lists.linux-foundation.org
Cc: akataria@vmware.com
Cc: rusty@rustcorp.com.au
Cc: boris.ostrovsky@oracle.com
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/20180828074026.820-13-jgross@suse.com
This commit is contained in:
Juergen Gross 2018-08-28 09:40:23 +02:00 committed by Thomas Gleixner
parent 40181646db
commit 9bad5658ea
16 changed files with 78 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/debugreg.h
View File

@ -8,7 +8,7 @@
DECLARE_PER_CPU(unsigned long, cpu_dr7);
#ifndef CONFIG_PARAVIRT
#ifndef CONFIG_PARAVIRT_XXL
/*
* These special macros can be used to get or set a debugging register
*/

4
arch/x86/include/asm/desc.h
View File

@ -108,7 +108,7 @@ static inline int desc_empty(const void *ptr)
return !(desc[0] | desc[1]);
}
#ifdef CONFIG_PARAVIRT
#ifdef CONFIG_PARAVIRT_XXL
#include <asm/paravirt.h>
#else
#define load_TR_desc() native_load_tr_desc()
@ -134,7 +134,7 @@ static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
{
}
#endif /* CONFIG_PARAVIRT */
#endif /* CONFIG_PARAVIRT_XXL */
#define store_ldt(ldt) asm("sldt %0" : "=m"(ldt))

16
arch/x86/include/asm/irqflags.h
View File

@ -122,6 +122,16 @@ static inline notrace unsigned long arch_local_irq_save(void)
#define ENABLE_INTERRUPTS(x) sti
#define DISABLE_INTERRUPTS(x) cli
#ifdef CONFIG_X86_64
#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
/*
@ -143,16 +153,12 @@ static inline notrace unsigned long arch_local_irq_save(void)
swapgs; \
sysretl
#ifdef CONFIG_DEBUG_ENTRY
#define SAVE_FLAGS(x) pushfq; popq %rax
#endif
#else
#define INTERRUPT_RETURN iret
#endif
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_PARAVIRT */
#endif /* CONFIG_PARAVIRT_XXL */
#ifndef __ASSEMBLY__
static inline int arch_irqs_disabled_flags(unsigned long flags)

4
arch/x86/include/asm/msr.h
View File

@ -242,7 +242,7 @@ static inline unsigned long long native_read_pmc(int counter)
return EAX_EDX_VAL(val, low, high);
}
#ifdef CONFIG_PARAVIRT
#ifdef CONFIG_PARAVIRT_XXL
#include <asm/paravirt.h>
#else
#include <linux/errno.h>
@ -305,7 +305,7 @@ do { \
#define rdpmcl(counter, val) ((val) = native_read_pmc(counter))
#endif /* !CONFIG_PARAVIRT */
#endif /* !CONFIG_PARAVIRT_XXL */
/*
* 64-bit version of wrmsr_safe():

19
arch/x86/include/asm/paravirt.h
View File

@ -17,6 +17,7 @@
#include <linux/cpumask.h>
#include <asm/frame.h>
#ifdef CONFIG_PARAVIRT_XXL
static inline void load_sp0(unsigned long sp0)
{
PVOP_VCALL1(cpu.load_sp0, sp0);
@ -51,6 +52,7 @@ static inline void write_cr0(unsigned long x)
{
PVOP_VCALL1(cpu.write_cr0, x);
}
#endif
static inline unsigned long read_cr2(void)
{
@ -72,6 +74,7 @@ static inline void write_cr3(unsigned long x)
PVOP_VCALL1(mmu.write_cr3, x);
}
#ifdef CONFIG_PARAVIRT_XXL
static inline void __write_cr4(unsigned long x)
{
PVOP_VCALL1(cpu.write_cr4, x);
@ -88,6 +91,7 @@ static inline void write_cr8(unsigned long x)
PVOP_VCALL1(cpu.write_cr8, x);
}
#endif
#endif
static inline void arch_safe_halt(void)
{
@ -99,14 +103,13 @@ static inline void halt(void)
PVOP_VCALL0(irq.halt);
}
#ifdef CONFIG_PARAVIRT_XXL
static inline void wbinvd(void)
{
PVOP_VCALL0(cpu.wbinvd);
}
#ifdef CONFIG_PARAVIRT_XXL
#define get_kernel_rpl() (pv_info.kernel_rpl)
#endif
static inline u64 paravirt_read_msr(unsigned msr)
{
@ -171,6 +174,7 @@ static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
*p = paravirt_read_msr_safe(msr, &err);
return err;
}
#endif
static inline unsigned long long paravirt_sched_clock(void)
{
@ -186,6 +190,7 @@ static inline u64 paravirt_steal_clock(int cpu)
return PVOP_CALL1(u64, time.steal_clock, cpu);
}
#ifdef CONFIG_PARAVIRT_XXL
static inline unsigned long long paravirt_read_pmc(int counter)
{
return PVOP_CALL1(u64, cpu.read_pmc, counter);
@ -230,6 +235,7 @@ static inline unsigned long paravirt_store_tr(void)
{
return PVOP_CALL0(unsigned long, cpu.store_tr);
}
#define store_tr(tr) ((tr) = paravirt_store_tr())
static inline void load_TLS(struct thread_struct *t, unsigned cpu)
{
@ -263,6 +269,7 @@ static inline void set_iopl_mask(unsigned mask)
{
PVOP_VCALL1(cpu.set_iopl_mask, mask);
}
#endif
/* The paravirtualized I/O functions */
static inline void slow_down_io(void)
@ -618,6 +625,7 @@ static inline void pmd_clear(pmd_t *pmdp)
}
#endif /* CONFIG_X86_PAE */
#ifdef CONFIG_PARAVIRT_XXL
#define __HAVE_ARCH_START_CONTEXT_SWITCH
static inline void arch_start_context_switch(struct task_struct *prev)
{
@ -628,6 +636,7 @@ static inline void arch_end_context_switch(struct task_struct *next)
{
PVOP_VCALL1(cpu.end_context_switch, next);
}
#endif
#define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
static inline void arch_enter_lazy_mmu_mode(void)
@ -870,10 +879,12 @@ extern void default_banner(void);
#define PARA_INDIRECT(addr) *%cs:addr
#endif
#ifdef CONFIG_PARAVIRT_XXL
#define INTERRUPT_RETURN \
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), \
@ -890,6 +901,7 @@ extern void default_banner(void);
PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
#ifdef CONFIG_X86_64
#ifdef CONFIG_PARAVIRT_XXL
/*
* If swapgs is used while the userspace stack is still current,
* there's no way to call a pvop. The PV replacement *must* be
@ -909,15 +921,18 @@ extern void default_banner(void);
ANNOTATE_RETPOLINE_SAFE; \
call PARA_INDIRECT(pv_ops+PV_CPU_swapgs); \
)
#endif
#define GET_CR2_INTO_RAX \
ANNOTATE_RETPOLINE_SAFE; \
call PARA_INDIRECT(pv_ops+PV_MMU_read_cr2);
#ifdef CONFIG_PARAVIRT_XXL
#define USERGS_SYSRET64 \
PARA_SITE(PARA_PATCH(PV_CPU_usergs_sysret64), \
ANNOTATE_RETPOLINE_SAFE; \
jmp PARA_INDIRECT(pv_ops+PV_CPU_usergs_sysret64);)
#endif
#ifdef CONFIG_DEBUG_ENTRY
#define SAVE_FLAGS(clobbers) \

5
arch/x86/include/asm/paravirt_types.h
View File

@ -106,6 +106,9 @@ struct pv_time_ops {
struct pv_cpu_ops {
/* hooks for various privileged instructions */
void (*io_delay)(void);
#ifdef CONFIG_PARAVIRT_XXL
unsigned long (*get_debugreg)(int regno);
void (*set_debugreg)(int regno, unsigned long value);
@ -143,7 +146,6 @@ 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 */
void (*cpuid)(unsigned int *eax, unsigned int *ebx,
@ -178,6 +180,7 @@ struct pv_cpu_ops {
void (*start_context_switch)(struct task_struct *prev);
void (*end_context_switch)(struct task_struct *next);
#endif
} __no_randomize_layout;
struct pv_irq_ops {

6
arch/x86/include/asm/pgtable.h
View File

@ -111,10 +111,12 @@ extern pmdval_t early_pmd_flags;
#define pte_val(x) native_pte_val(x)
#define __pte(x) native_make_pte(x)
#define arch_end_context_switch(prev) do {} while(0)
#endif /* CONFIG_PARAVIRT */
#ifndef CONFIG_PARAVIRT_XXL
#define arch_end_context_switch(prev) do {} while(0)
#endif /* CONFIG_PARAVIRT_XXL */
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..

4
arch/x86/include/asm/processor.h
View File

@ -578,7 +578,7 @@ static inline bool on_thread_stack(void)
current_stack_pointer) < THREAD_SIZE;
}
#ifdef CONFIG_PARAVIRT
#ifdef CONFIG_PARAVIRT_XXL
#include <asm/paravirt.h>
#else
#define __cpuid native_cpuid
@ -589,7 +589,7 @@ static inline void load_sp0(unsigned long sp0)
}
#define set_iopl_mask native_set_iopl_mask
#endif /* CONFIG_PARAVIRT */
#endif /* CONFIG_PARAVIRT_XXL */
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);

9
arch/x86/include/asm/special_insns.h
View File

@ -143,8 +143,9 @@ static inline unsigned long __read_cr4(void)
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
#endif
#ifndef CONFIG_PARAVIRT_XXL
static inline unsigned long read_cr0(void)
{
return native_read_cr0();
@ -154,7 +155,9 @@ static inline void write_cr0(unsigned long x)
{
native_write_cr0(x);
}
#endif
#ifndef CONFIG_PARAVIRT
static inline unsigned long read_cr2(void)
{
return native_read_cr2();
@ -178,7 +181,9 @@ static inline void write_cr3(unsigned long x)
{
native_write_cr3(x);
}
#endif
#ifndef CONFIG_PARAVIRT_XXL
static inline void __write_cr4(unsigned long x)
{
native_write_cr4(x);
@ -208,7 +213,7 @@ static inline void load_gs_index(unsigned selector)
#endif
#endif/* CONFIG_PARAVIRT */
#endif/* CONFIG_PARAVIRT_XXL */
static inline void clflush(volatile void *__p)
{

2
arch/x86/kernel/asm-offsets.c
View File

@ -68,7 +68,9 @@ void common(void) {
BLANK();
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);
#endif

2
arch/x86/kernel/asm-offsets_64.c
View File

@ -21,9 +21,11 @@ static char syscalls_ia32[] = {
int main(void)
{
#ifdef CONFIG_PARAVIRT
#ifdef CONFIG_PARAVIRT_XXL
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

2
arch/x86/kernel/cpu/common.c
View File

@ -1240,7 +1240,7 @@ static void generic_identify(struct cpuinfo_x86 *c)
* ESPFIX issue, we can change this.
*/
#ifdef CONFIG_X86_32
# ifdef CONFIG_PARAVIRT
# ifdef CONFIG_PARAVIRT_XXL
do {
extern void native_iret(void);
if (pv_ops.cpu.iret == native_iret)

2
arch/x86/kernel/head_64.S
View File

@ -31,6 +31,8 @@
#define GET_CR2_INTO(reg) GET_CR2_INTO_RAX ; movq %rax, reg
#else
#define GET_CR2_INTO(reg) movq %cr2, reg
#endif
#ifndef CONFIG_PARAVIRT_XXL
#define INTERRUPT_RETURN iretq
#endif

13
arch/x86/kernel/paravirt.c
View File

@ -101,6 +101,7 @@ static unsigned paravirt_patch_call(void *insnbuf, const void *target,
return 5;
}
#ifdef CONFIG_PARAVIRT_XXL
static unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
unsigned long addr, unsigned len)
{
@ -119,6 +120,7 @@ static unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
return 5;
}
#endif
DEFINE_STATIC_KEY_TRUE(virt_spin_lock_key);
@ -150,10 +152,12 @@ unsigned paravirt_patch_default(u8 type, void *insnbuf,
else if (opfunc == _paravirt_ident_64)
ret = paravirt_patch_ident_64(insnbuf, len);
#ifdef CONFIG_PARAVIRT_XXL
else if (type == PARAVIRT_PATCH(cpu.iret) ||
type == PARAVIRT_PATCH(cpu.usergs_sysret64))
/* If operation requires a jmp, then jmp */
ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
#endif
else
/* Otherwise call the function. */
ret = paravirt_patch_call(insnbuf, opfunc, addr, len);
@ -262,6 +266,7 @@ void paravirt_flush_lazy_mmu(void)
preempt_enable();
}
#ifdef CONFIG_PARAVIRT_XXL
void paravirt_start_context_switch(struct task_struct *prev)
{
BUG_ON(preemptible());
@ -282,6 +287,7 @@ void paravirt_end_context_switch(struct task_struct *next)
if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES))
arch_enter_lazy_mmu_mode();
}
#endif
enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
{
@ -320,6 +326,9 @@ struct paravirt_patch_template pv_ops = {
.time.steal_clock = native_steal_clock,
/* Cpu ops. */
.cpu.io_delay = native_io_delay,
#ifdef CONFIG_PARAVIRT_XXL
.cpu.cpuid = native_cpuid,
.cpu.get_debugreg = native_get_debugreg,
.cpu.set_debugreg = native_set_debugreg,
@ -361,10 +370,10 @@ struct paravirt_patch_template pv_ops = {
.cpu.swapgs = native_swapgs,
.cpu.set_iopl_mask = native_set_iopl_mask,
.cpu.io_delay = native_io_delay,
.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),
@ -464,10 +473,12 @@ struct paravirt_patch_template pv_ops = {
#endif
};
#ifdef CONFIG_PARAVIRT_XXL
/* At this point, native_get/set_debugreg has real function entries */
NOKPROBE_SYMBOL(native_get_debugreg);
NOKPROBE_SYMBOL(native_set_debugreg);
NOKPROBE_SYMBOL(native_load_idt);
#endif
EXPORT_SYMBOL_GPL(pv_ops);
EXPORT_SYMBOL_GPL(pv_info);

4
arch/x86/kernel/paravirt_patch_32.c
View File

@ -5,7 +5,9 @@ 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");
DEF_NATIVE(mmu, write_cr3, "mov %eax, %cr3");
DEF_NATIVE(mmu, read_cr3, "mov %cr3, %eax");
@ -45,7 +47,9 @@ unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
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);
PATCH_SITE(mmu, read_cr3);
PATCH_SITE(mmu, write_cr3);

6
arch/x86/kernel/paravirt_patch_64.c
View File

@ -10,10 +10,12 @@ DEF_NATIVE(irq, save_fl, "pushfq; popq %rax");
DEF_NATIVE(mmu, read_cr2, "movq %cr2, %rax");
DEF_NATIVE(mmu, read_cr3, "movq %cr3, %rax");
DEF_NATIVE(mmu, write_cr3, "movq %rdi, %cr3");
#ifdef CONFIG_PARAVIRT_XXL
DEF_NATIVE(cpu, wbinvd, "wbinvd");
DEF_NATIVE(cpu, usergs_sysret64, "swapgs; sysretq");
DEF_NATIVE(cpu, swapgs, "swapgs");
#endif
DEF_NATIVE(, mov32, "mov %edi, %eax");
DEF_NATIVE(, mov64, "mov %rdi, %rax");
@ -53,12 +55,14 @@ unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
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);
#endif
PATCH_SITE(mmu, read_cr2);
PATCH_SITE(mmu, read_cr3);
PATCH_SITE(mmu, write_cr3);
PATCH_SITE(cpu, wbinvd);
#if defined(CONFIG_PARAVIRT_SPINLOCKS)
case PARAVIRT_PATCH(lock.queued_spin_unlock):
if (pv_is_native_spin_unlock()) {