x86/lguest: Remove lguest support

Lguest seems to be rather unused these days. It has seen only patches
ensuring it still builds the last two years and its official state is
"Odd Fixes".

Remove it in order to be able to clean up the paravirt code.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: boris.ostrovsky@oracle.com
Cc: lguest@lists.ozlabs.org
Cc: rusty@rustcorp.com.au
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/20170816173157.8633-3-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 2 insertions, 119 deletions

diff --git a/include/linux/lguest.h b/include/linux/lguest.h
deleted file mode 100644
index 6db19f3..0000000
--- a/include/linux/lguest.h
+++ /dev/null
@@ -1,73 +0,0 @@
-/*
- * 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 */
diff --git a/include/linux/lguest_launcher.h b/include/linux/lguest_launcher.h
deleted file mode 100644
index acd5b12..0000000
--- a/include/linux/lguest_launcher.h
+++ /dev/null
@@ -1,44 +0,0 @@
-#ifndef _LINUX_LGUEST_LAUNCHER
-#define _LINUX_LGUEST_LAUNCHER
-/* Everything the "lguest" userspace program needs to know. */
-#include <linux/types.h>
-
-/*D:010
- * Drivers
- *
- * The Guest needs devices to do anything useful.  Since we don't let it touch
- * real devices (think of the damage it could do!) we provide virtual devices.
- * We emulate a PCI bus with virtio devices on it; we used to have our own
- * lguest bus which was far simpler, but this tests the virtio 1.0 standard.
- *
- * Virtio devices are also used by kvm, so we can simply reuse their optimized
- * device drivers.  And one day when everyone uses virtio, my plan will be
- * complete.  Bwahahahah!
- */
-
-/* Write command first word is a request. */
-enum lguest_req
-{
-	LHREQ_INITIALIZE, /* + base, pfnlimit, start */
-	LHREQ_GETDMA, /* No longer used */
-	LHREQ_IRQ, /* + irq */
-	LHREQ_BREAK, /* No longer used */
-	LHREQ_EVENTFD, /* No longer used. */
-	LHREQ_GETREG, /* + offset within struct pt_regs (then read value). */
-	LHREQ_SETREG, /* + offset within struct pt_regs, value. */
-	LHREQ_TRAP, /* + trap number to deliver to guest. */
-};
-
-/*
- * This is what read() of the lguest fd populates.  trap ==
- * LGUEST_TRAP_ENTRY for an LHCALL_NOTIFY (addr is the
- * argument), 14 for a page fault in the MMIO region (addr is
- * the trap address, insn is the instruction), or 13 for a GPF
- * (insn is the instruction).
- */
-struct lguest_pending {
-	__u8 trap;
-	__u8 insn[7];
-	__u32 addr;
-};
-#endif /* _LINUX_LGUEST_LAUNCHER */
diff --git a/include/uapi/linux/virtio_ring.h b/include/uapi/linux/virtio_ring.h
index c072959..6d5d5fa 100644
--- a/include/uapi/linux/virtio_ring.h
+++ b/include/uapi/linux/virtio_ring.h
@@ -1,7 +1,7 @@
 #ifndef _UAPI_LINUX_VIRTIO_RING_H
 #define _UAPI_LINUX_VIRTIO_RING_H
-/* An interface for efficient virtio implementation, currently for use by KVM
- * and lguest, but hopefully others soon.  Do NOT change this since it will
+/* An interface for efficient virtio implementation, currently for use by KVM,
+ * but hopefully others soon.  Do NOT change this since it will
  * break existing servers and clients.
  *
  * This header is BSD licensed so anyone can use the definitions to implement