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authorJeremy Fitzhardinge <jeremy@xensource.com>2007-07-18 05:37:07 +0400
committerJeremy Fitzhardinge <jeremy@goop.org>2007-07-18 19:47:45 +0400
commit60223a326fc8fa6e90e2c3fd28ae6de4a311d731 (patch)
treecf4e667a56402b846488373bfaf5bf840395e219 /include/xen
parent3e2b8fbeec8f005672f2a2e862fb9c26a0bafedc (diff)
downloadlinux-60223a326fc8fa6e90e2c3fd28ae6de4a311d731.tar.xz
xen: Place vcpu_info structure into per-cpu memory
An experimental patch for Xen allows guests to place their vcpu_info structs anywhere. We try to use this to place the vcpu_info into the PDA, which allows direct access. If this works, then switch to using direct access operations for irq_enable, disable, save_fl and restore_fl. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: Keir Fraser <keir@xensource.com>
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/interface/vcpu.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/xen/interface/vcpu.h b/include/xen/interface/vcpu.h
index c6218f1ad3ca..ff61ea365997 100644
--- a/include/xen/interface/vcpu.h
+++ b/include/xen/interface/vcpu.h
@@ -151,4 +151,17 @@ struct vcpu_set_singleshot_timer {
#define _VCPU_SSHOTTMR_future (0)
#define VCPU_SSHOTTMR_future (1U << _VCPU_SSHOTTMR_future)
+/*
+ * Register a memory location in the guest address space for the
+ * vcpu_info structure. This allows the guest to place the vcpu_info
+ * structure in a convenient place, such as in a per-cpu data area.
+ * The pointer need not be page aligned, but the structure must not
+ * cross a page boundary.
+ */
+#define VCPUOP_register_vcpu_info 10 /* arg == struct vcpu_info */
+struct vcpu_register_vcpu_info {
+ uint32_t mfn; /* mfn of page to place vcpu_info */
+ uint32_t offset; /* offset within page */
+};
+
#endif /* __XEN_PUBLIC_VCPU_H__ */