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authorThomas Gleixner <tglx@linutronix.de>2020-05-21 23:05:26 +0300
committerThomas Gleixner <tglx@linutronix.de>2020-06-11 16:15:08 +0300
commit2f6474e4636bcc68af6c44abb2703f12d7f083da (patch)
tree317a6b92fc169077e1eb9c3d7a10e3c62869109d /include/xen
parent1de16e0c17155d138282f3a9f65914a9a5da757e (diff)
downloadlinux-2f6474e4636bcc68af6c44abb2703f12d7f083da.tar.xz
x86/entry: Switch XEN/PV hypercall entry to IDTENTRY
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
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/xen-ops.h19
1 files changed, 7 insertions, 12 deletions
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 095be1d66f31..39a5580f8feb 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -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 */