x86: adds paravirt hook for swapgs
This patch adds paravirt hook for swapgs operation, which is a privileged operation in x86_64. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -390,6 +390,7 @@ struct pv_cpu_ops pv_cpu_ops = {
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.irq_enable_syscall_ret = native_irq_enable_syscall_ret,
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.irq_enable_syscall_ret = native_irq_enable_syscall_ret,
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.iret = native_iret,
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.iret = native_iret,
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.swapgs = native_swapgs,
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.set_iopl_mask = native_set_iopl_mask,
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.set_iopl_mask = native_set_iopl_mask,
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.io_delay = native_io_delay,
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.io_delay = native_io_delay,
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@ -127,6 +127,8 @@ struct pv_cpu_ops {
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void (*irq_enable_syscall_ret)(void);
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void (*irq_enable_syscall_ret)(void);
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void (*iret)(void);
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void (*iret)(void);
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void (*swapgs)(void);
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struct pv_lazy_ops lazy_mode;
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struct pv_lazy_ops lazy_mode;
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};
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};
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@ -1228,6 +1230,13 @@ static inline unsigned long __raw_local_irq_save(void)
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call *pv_cpu_ops+PV_CPU_read_cr0; \
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call *pv_cpu_ops+PV_CPU_read_cr0; \
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pop %edx; pop %ecx
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pop %edx; pop %ecx
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#else
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#else
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#define SWAPGS \
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PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \
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PV_SAVE_REGS; \
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call *pv_cpu_ops+PV_CPU_swapgs; \
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PV_RESTORE_REGS \
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)
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#define GET_CR2_INTO_RCX \
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#define GET_CR2_INTO_RCX \
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call *pv_mmu_ops+PV_MMU_read_cr2; \
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call *pv_mmu_ops+PV_MMU_read_cr2; \
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movq %rax, %rcx; \
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movq %rax, %rcx; \
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@ -435,6 +435,13 @@ static inline void native_load_sp0(struct tss_struct *tss,
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#endif
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#endif
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}
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}
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static inline void native_swapgs(void)
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{
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#ifdef CONFIG_X86_64
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asm volatile("swapgs" ::: "memory");
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#endif
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}
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#ifdef CONFIG_PARAVIRT
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#ifdef CONFIG_PARAVIRT
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#include <asm/paravirt.h>
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#include <asm/paravirt.h>
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#else
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#else
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@ -456,6 +463,7 @@ static inline void load_sp0(struct tss_struct *tss,
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}
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}
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#define set_iopl_mask native_set_iopl_mask
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#define set_iopl_mask native_set_iopl_mask
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#define SWAPGS swapgs
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#endif /* CONFIG_PARAVIRT */
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#endif /* CONFIG_PARAVIRT */
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/*
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/*
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