x86: adds paravirt hook for swapgs (e801f864) · Commits · 戴 / test

arch/x86/kernel/paravirt.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -390,6 +390,7 @@ struct pv_cpu_ops pv_cpu_ops = {

		.irq_enable_syscall_ret = native_irq_enable_syscall_ret,
		.iret = native_iret,
		.swapgs = native_swapgs,

		.set_iopl_mask = native_set_iopl_mask,
		.io_delay = native_io_delay,

+9 −0

Original line number	Diff line number	Diff line
		@@ -127,6 +127,8 @@ struct pv_cpu_ops {
		void (*irq_enable_syscall_ret)(void);
		void (*iret)(void);

		void (*swapgs)(void);

		struct pv_lazy_ops lazy_mode;
		};

		@@ -1228,6 +1230,13 @@ static inline unsigned long __raw_local_irq_save(void)
		call *pv_cpu_ops+PV_CPU_read_cr0; \
		pop %edx; pop %ecx
		#else
		#define SWAPGS \
		PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \
		PV_SAVE_REGS; \
		call *pv_cpu_ops+PV_CPU_swapgs; \
		PV_RESTORE_REGS \
		)

		#define GET_CR2_INTO_RCX \
		call *pv_mmu_ops+PV_MMU_read_cr2; \
		movq %rax, %rcx; \

+8 −0

Original line number	Diff line number	Diff line
		@@ -435,6 +435,13 @@ static inline void native_load_sp0(struct tss_struct *tss,
		#endif
		}

		static inline void native_swapgs(void)
		{
		#ifdef CONFIG_X86_64
		asm volatile("swapgs" ::: "memory");
		#endif
		}

		#ifdef CONFIG_PARAVIRT
		#include <asm/paravirt.h>
		#else
		@@ -456,6 +463,7 @@ static inline void load_sp0(struct tss_struct *tss,
		}

		#define set_iopl_mask native_set_iopl_mask
		#define SWAPGS swapgs
		#endif /* CONFIG_PARAVIRT */

		/*