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x86/entry: Switch XEN/PV hypercall entry to IDTENTRY

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Convert the XEN/PV hypercall to IDTENTRY:

  - Emit the ASM stub with DECLARE_IDTENTRY
  - Remove the ASM idtentry in 64-bit
  - Remove the open coded ASM entry code in 32-bit
  - Remove the old prototypes

The handler stubs need to stay in ASM code as they need corner case handling
and adjustment of the stack pointer.

Provide a new C function which invokes the entry/exit handling and calls
into the XEN handler on the interrupt stack if required.

The exit code is slightly different from the regular idtentry_exit() on
non-preemptible kernels. If the hypercall is preemptible and need_resched()
is set then XEN provides a preempt hypercall scheduling function.

Move this functionality into the entry code so it can use the existing
idtentry functionality.

[ mingo: Build fixes. ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Juergen Gross <jgross@suse.com>
Tested-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20200521202118.055270078@linutronix.de
This commit is contained in:
Thomas Gleixner
2020-05-21 22:05:26 +02:00
parent 1de16e0c17
commit 2f6474e463
12 changed files with 151 additions and 86 deletions
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19
include/xen/xen-ops.h
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@@ -215,17 +215,7 @@ bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
void xen_efi_runtime_setup(void);
#ifdef CONFIG_PREEMPTION
static inline void xen_preemptible_hcall_begin(void)
{
}
static inline void xen_preemptible_hcall_end(void)
{
}
#else
#if defined(CONFIG_XEN_PV) && !defined(CONFIG_PREEMPTION)
DECLARE_PER_CPU(bool, xen_in_preemptible_hcall);
@@ -239,6 +229,11 @@ static inline void xen_preemptible_hcall_end(void)
__this_cpu_write(xen_in_preemptible_hcall, false);
}
#endif /* CONFIG_PREEMPTION */
#else
static inline void xen_preemptible_hcall_begin(void) { }
static inline void xen_preemptible_hcall_end(void) { }
#endif /* CONFIG_XEN_PV && !CONFIG_PREEMPTION */
#endif /* INCLUDE_XEN_OPS_H */