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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /include/linux/lguest.h
Initial import
Diffstat (limited to 'include/linux/lguest.h')
-rw-r--r--include/linux/lguest.h73
1 files changed, 73 insertions, 0 deletions
diff --git a/include/linux/lguest.h b/include/linux/lguest.h
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+++ b/include/linux/lguest.h
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+/*
+ * Things the lguest guest needs to know. Note: like all lguest interfaces,
+ * this is subject to wild and random change between versions.
+ */
+#ifndef _LINUX_LGUEST_H
+#define _LINUX_LGUEST_H
+
+#ifndef __ASSEMBLY__
+#include <linux/time.h>
+#include <asm/irq.h>
+#include <asm/lguest_hcall.h>
+
+#define LG_CLOCK_MIN_DELTA 100UL
+#define LG_CLOCK_MAX_DELTA ULONG_MAX
+
+/*G:031
+ * The second method of communicating with the Host is to via "struct
+ * lguest_data". Once the Guest's initialization hypercall tells the Host where
+ * this is, the Guest and Host both publish information in it.
+:*/
+struct lguest_data {
+ /*
+ * 512 == enabled (same as eflags in normal hardware). The Guest
+ * changes interrupts so often that a hypercall is too slow.
+ */
+ unsigned int irq_enabled;
+ /* Fine-grained interrupt disabling by the Guest */
+ DECLARE_BITMAP(blocked_interrupts, LGUEST_IRQS);
+
+ /*
+ * The Host writes the virtual address of the last page fault here,
+ * which saves the Guest a hypercall. CR2 is the native register where
+ * this address would normally be found.
+ */
+ unsigned long cr2;
+
+ /* Wallclock time set by the Host. */
+ struct timespec time;
+
+ /*
+ * Interrupt pending set by the Host. The Guest should do a hypercall
+ * if it re-enables interrupts and sees this set (to X86_EFLAGS_IF).
+ */
+ int irq_pending;
+
+ /*
+ * Async hypercall ring. Instead of directly making hypercalls, we can
+ * place them in here for processing the next time the Host wants.
+ * This batching can be quite efficient.
+ */
+
+ /* 0xFF == done (set by Host), 0 == pending (set by Guest). */
+ u8 hcall_status[LHCALL_RING_SIZE];
+ /* The actual registers for the hypercalls. */
+ struct hcall_args hcalls[LHCALL_RING_SIZE];
+
+/* Fields initialized by the Host at boot: */
+ /* Memory not to try to access */
+ unsigned long reserve_mem;
+ /* KHz for the TSC clock. */
+ u32 tsc_khz;
+
+/* Fields initialized by the Guest at boot: */
+ /* Instruction to suppress interrupts even if enabled */
+ unsigned long noirq_iret;
+ /* Address above which page tables are all identical. */
+ unsigned long kernel_address;
+ /* The vector to try to use for system calls (0x40 or 0x80). */
+ unsigned int syscall_vec;
+};
+extern struct lguest_data lguest_data;
+#endif /* __ASSEMBLY__ */
+#endif /* _LINUX_LGUEST_H */