lguest: the host code

This is the code for the "lg.ko" module, which allows lguest guests to
be launched.

[akpm@linux-foundation.org: update for futex-new-private-futexes]
[akpm@linux-foundation.org: build fix]
[jmorris@namei.org: lguest: use hrtimers]
[akpm@linux-foundation.org: x86_64 build fix]
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>
Cc: Eric Dumazet <dada1@cosmosbay.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 73 insertions, 0 deletions

diff --git a/include/linux/lguest_launcher.h b/include/linux/lguest_launcher.h
new file mode 100644
index 000000000000..0ba414a40c80
--- /dev/null
+++ b/include/linux/lguest_launcher.h
@@ -0,0 +1,73 @@
+#ifndef _ASM_LGUEST_USER
+#define _ASM_LGUEST_USER
+/* Everything the "lguest" userspace program needs to know. */
+/* They can register up to 32 arrays of lguest_dma. */
+#define LGUEST_MAX_DMA          32
+/* At most we can dma 16 lguest_dma in one op. */
+#define LGUEST_MAX_DMA_SECTIONS 16
+
+/* How many devices?  Assume each one wants up to two dma arrays per device. */
+#define LGUEST_MAX_DEVICES (LGUEST_MAX_DMA/2)
+
+struct lguest_dma
+{
+        /* 0 if free to be used, filled by hypervisor. */
+        u32 used_len;
+        unsigned long addr[LGUEST_MAX_DMA_SECTIONS];
+        u16 len[LGUEST_MAX_DMA_SECTIONS];
+};
+
+struct lguest_block_page
+{
+        /* 0 is a read, 1 is a write. */
+        int type;
+        u32 sector;     /* Offset in device = sector * 512. */
+        u32 bytes;      /* Length expected to be read/written in bytes */
+        /* 0 = pending, 1 = done, 2 = done, error */
+        int result;
+        u32 num_sectors; /* Disk length = num_sectors * 512 */
+};
+
+/* There is a shared page of these. */
+struct lguest_net
+{
+        /* Simply the mac address (with multicast bit meaning promisc). */
+        unsigned char mac[6];
+};
+
+/* Where the Host expects the Guest to SEND_DMA console output to. */
+#define LGUEST_CONSOLE_DMA_KEY 0
+
+/* We have a page of these descriptors in the lguest_device page. */
+struct lguest_device_desc {
+        u16 type;
+#define LGUEST_DEVICE_T_CONSOLE 1
+#define LGUEST_DEVICE_T_NET     2
+#define LGUEST_DEVICE_T_BLOCK   3
+
+        u16 features;
+#define LGUEST_NET_F_NOCSUM             0x4000 /* Don't bother checksumming */
+#define LGUEST_DEVICE_F_RANDOMNESS      0x8000 /* IRQ is fairly random */
+
+        u16 status;
+/* 256 and above are device specific. */
+#define LGUEST_DEVICE_S_ACKNOWLEDGE     1 /* We have seen device. */
+#define LGUEST_DEVICE_S_DRIVER          2 /* We have found a driver */
+#define LGUEST_DEVICE_S_DRIVER_OK       4 /* Driver says OK! */
+#define LGUEST_DEVICE_S_REMOVED         8 /* Device has gone away. */
+#define LGUEST_DEVICE_S_REMOVED_ACK     16 /* Driver has been told. */
+#define LGUEST_DEVICE_S_FAILED          128 /* Something actually failed */
+
+        u16 num_pages;
+        u32 pfn;
+};
+
+/* Write command first word is a request. */
+enum lguest_req
+{
+        LHREQ_INITIALIZE, /* + pfnlimit, pgdir, start, pageoffset */
+        LHREQ_GETDMA, /* + addr (returns &lguest_dma, irq in ->used_len) */
+        LHREQ_IRQ, /* + irq */
+        LHREQ_BREAK, /* + on/off flag (on blocks until someone does off) */
+};
+#endif /* _ASM_LGUEST_USER */