15045275c3
This patch gets rid of the old lguest host I/O infrastructure and replaces it with a single hypercall "LHCALL_NOTIFY" which takes an address. The main change is the removal of io.c: that mainly did inter-guest I/O, which virtio doesn't yet support. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
69 lines
2.5 KiB
C
69 lines
2.5 KiB
C
#ifndef _ASM_LGUEST_USER
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#define _ASM_LGUEST_USER
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/* Everything the "lguest" userspace program needs to know. */
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#include <linux/types.h>
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/* They can register up to 32 arrays of lguest_dma. */
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#define LGUEST_MAX_DMA 32
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/* At most we can dma 16 lguest_dma in one op. */
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#define LGUEST_MAX_DMA_SECTIONS 16
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/* How many devices? Assume each one wants up to two dma arrays per device. */
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#define LGUEST_MAX_DEVICES (LGUEST_MAX_DMA/2)
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/* Where the Host expects the Guest to SEND_DMA console output to. */
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#define LGUEST_CONSOLE_DMA_KEY 0
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/*D:010
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* Drivers
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*
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* The Guest needs devices to do anything useful. Since we don't let it touch
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* real devices (think of the damage it could do!) we provide virtual devices.
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* We could emulate a PCI bus with various devices on it, but that is a fairly
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* complex burden for the Host and suboptimal for the Guest, so we have our own
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* "lguest" bus and simple drivers.
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*
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* Devices are described by an array of LGUEST_MAX_DEVICES of these structs,
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* placed by the Launcher just above the top of physical memory:
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*/
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struct lguest_device_desc {
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/* The device type: console, network, disk etc. */
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__u16 type;
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#define LGUEST_DEVICE_T_CONSOLE 1
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#define LGUEST_DEVICE_T_NET 2
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#define LGUEST_DEVICE_T_BLOCK 3
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/* The specific features of this device: these depends on device type
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* except for LGUEST_DEVICE_F_RANDOMNESS. */
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__u16 features;
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#define LGUEST_NET_F_NOCSUM 0x4000 /* Don't bother checksumming */
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#define LGUEST_DEVICE_F_RANDOMNESS 0x8000 /* IRQ is fairly random */
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/* This is how the Guest reports status of the device: the Host can set
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* LGUEST_DEVICE_S_REMOVED to indicate removal, but the rest are only
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* ever manipulated by the Guest, and only ever set. */
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__u16 status;
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/* 256 and above are device specific. */
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#define LGUEST_DEVICE_S_ACKNOWLEDGE 1 /* We have seen device. */
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#define LGUEST_DEVICE_S_DRIVER 2 /* We have found a driver */
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#define LGUEST_DEVICE_S_DRIVER_OK 4 /* Driver says OK! */
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#define LGUEST_DEVICE_S_REMOVED 8 /* Device has gone away. */
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#define LGUEST_DEVICE_S_REMOVED_ACK 16 /* Driver has been told. */
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#define LGUEST_DEVICE_S_FAILED 128 /* Something actually failed */
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/* Each device exists somewhere in Guest physical memory, over some
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* number of pages. */
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__u16 num_pages;
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__u32 pfn;
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};
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/*:*/
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/* Write command first word is a request. */
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enum lguest_req
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{
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LHREQ_INITIALIZE, /* + pfnlimit, pgdir, start, pageoffset */
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LHREQ_GETDMA, /* No longer used */
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LHREQ_IRQ, /* + irq */
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LHREQ_BREAK, /* + on/off flag (on blocks until someone does off) */
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};
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#endif /* _ASM_LGUEST_USER */
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