Commit a6bd8e13 authored by Rusty Russell's avatar Rusty Russell

lguest: comment documentation update.

Took some cycles to re-read the Lguest Journey end-to-end, fix some
rot and tighten some phrases.

Only comments change.  No new jokes, but a couple of recycled old jokes.
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent e18b094f
/*P:100 This is the Launcher code, a simple program which lays out the
* "physical" memory for the new Guest by mapping the kernel image and the
* virtual devices, then reads repeatedly from /dev/lguest to run the Guest.
:*/
* "physical" memory for the new Guest by mapping the kernel image and
* the virtual devices, then opens /dev/lguest to tell the kernel
* about the Guest and control it. :*/
#define _LARGEFILE64_SOURCE
#define _GNU_SOURCE
#include <stdio.h>
......@@ -43,7 +43,7 @@
#include "linux/virtio_console.h"
#include "linux/virtio_ring.h"
#include "asm-x86/bootparam.h"
/*L:110 We can ignore the 38 include files we need for this program, but I do
/*L:110 We can ignore the 39 include files we need for this program, but I do
* want to draw attention to the use of kernel-style types.
*
* As Linus said, "C is a Spartan language, and so should your naming be." I
......@@ -320,7 +320,7 @@ static unsigned long map_elf(int elf_fd, const Elf32_Ehdr *ehdr)
err(1, "Reading program headers");
/* Try all the headers: there are usually only three. A read-only one,
* a read-write one, and a "note" section which isn't loadable. */
* a read-write one, and a "note" section which we don't load. */
for (i = 0; i < ehdr->e_phnum; i++) {
/* If this isn't a loadable segment, we ignore it */
if (phdr[i].p_type != PT_LOAD)
......@@ -387,7 +387,7 @@ static unsigned long load_kernel(int fd)
if (memcmp(hdr.e_ident, ELFMAG, SELFMAG) == 0)
return map_elf(fd, &hdr);
/* Otherwise we assume it's a bzImage, and try to unpack it */
/* Otherwise we assume it's a bzImage, and try to load it. */
return load_bzimage(fd);
}
......@@ -433,12 +433,12 @@ static unsigned long load_initrd(const char *name, unsigned long mem)
return len;
}
/* Once we know how much memory we have, we can construct simple linear page
/* Once we know how much memory we have we can construct simple linear page
* tables which set virtual == physical which will get the Guest far enough
* into the boot to create its own.
*
* We lay them out of the way, just below the initrd (which is why we need to
* know its size). */
* know its size here). */
static unsigned long setup_pagetables(unsigned long mem,
unsigned long initrd_size)
{
......@@ -850,7 +850,8 @@ static void handle_console_output(int fd, struct virtqueue *vq)
*
* Handling output for network is also simple: we get all the output buffers
* and write them (ignoring the first element) to this device's file descriptor
* (stdout). */
* (/dev/net/tun).
*/
static void handle_net_output(int fd, struct virtqueue *vq)
{
unsigned int head, out, in;
......@@ -924,7 +925,7 @@ static void enable_fd(int fd, struct virtqueue *vq)
write(waker_fd, &vq->dev->fd, sizeof(vq->dev->fd));
}
/* Resetting a device is fairly easy. */
/* When the Guest asks us to reset a device, it's is fairly easy. */
static void reset_device(struct device *dev)
{
struct virtqueue *vq;
......@@ -1003,8 +1004,8 @@ static void handle_input(int fd)
if (select(devices.max_infd+1, &fds, NULL, NULL, &poll) == 0)
break;
/* Otherwise, call the device(s) which have readable
* file descriptors and a method of handling them. */
/* Otherwise, call the device(s) which have readable file
* descriptors and a method of handling them. */
for (i = devices.dev; i; i = i->next) {
if (i->handle_input && FD_ISSET(i->fd, &fds)) {
int dev_fd;
......@@ -1015,8 +1016,7 @@ static void handle_input(int fd)
* should no longer service it. Networking and
* console do this when there's no input
* buffers to deliver into. Console also uses
* it when it discovers that stdin is
* closed. */
* it when it discovers that stdin is closed. */
FD_CLR(i->fd, &devices.infds);
/* Tell waker to ignore it too, by sending a
* negative fd number (-1, since 0 is a valid
......@@ -1033,7 +1033,8 @@ static void handle_input(int fd)
*
* All devices need a descriptor so the Guest knows it exists, and a "struct
* device" so the Launcher can keep track of it. We have common helper
* routines to allocate and manage them. */
* routines to allocate and manage them.
*/
/* The layout of the device page is a "struct lguest_device_desc" followed by a
* number of virtqueue descriptors, then two sets of feature bits, then an
......@@ -1078,7 +1079,7 @@ static void add_virtqueue(struct device *dev, unsigned int num_descs,
struct virtqueue **i, *vq = malloc(sizeof(*vq));
void *p;
/* First we need some pages for this virtqueue. */
/* First we need some memory for this virtqueue. */
pages = (vring_size(num_descs, getpagesize()) + getpagesize() - 1)
/ getpagesize();
p = get_pages(pages);
......@@ -1122,7 +1123,7 @@ static void add_virtqueue(struct device *dev, unsigned int num_descs,
}
/* The first half of the feature bitmask is for us to advertise features. The
* second half if for the Guest to accept features. */
* second half is for the Guest to accept features. */
static void add_feature(struct device *dev, unsigned bit)
{
u8 *features = get_feature_bits(dev);
......@@ -1151,7 +1152,9 @@ static void set_config(struct device *dev, unsigned len, const void *conf)
}
/* This routine does all the creation and setup of a new device, including
* calling new_dev_desc() to allocate the descriptor and device memory. */
* calling new_dev_desc() to allocate the descriptor and device memory.
*
* See what I mean about userspace being boring? */
static struct device *new_device(const char *name, u16 type, int fd,
bool (*handle_input)(int, struct device *))
{
......@@ -1492,7 +1495,10 @@ static int io_thread(void *_dev)
while (read(vblk->workpipe[0], &c, 1) == 1) {
/* We acknowledge each request immediately to reduce latency,
* rather than waiting until we've done them all. I haven't
* measured to see if it makes any difference. */
* measured to see if it makes any difference.
*
* That would be an interesting test, wouldn't it? You could
* also try having more than one I/O thread. */
while (service_io(dev))
write(vblk->done_fd, &c, 1);
}
......@@ -1500,7 +1506,7 @@ static int io_thread(void *_dev)
}
/* Now we've seen the I/O thread, we return to the Launcher to see what happens
* when the thread tells us it's completed some I/O. */
* when that thread tells us it's completed some I/O. */
static bool handle_io_finish(int fd, struct device *dev)
{
char c;
......@@ -1572,11 +1578,12 @@ static void setup_block_file(const char *filename)
* more work. */
pipe(vblk->workpipe);
/* Create stack for thread and run it */
/* Create stack for thread and run it. Since stack grows upwards, we
* point the stack pointer to the end of this region. */
stack = malloc(32768);
/* SIGCHLD - We dont "wait" for our cloned thread, so prevent it from
* becoming a zombie. */
if (clone(io_thread, stack + 32768, CLONE_VM | SIGCHLD, dev) == -1)
if (clone(io_thread, stack + 32768, CLONE_VM | SIGCHLD, dev) == -1)
err(1, "Creating clone");
/* We don't need to keep the I/O thread's end of the pipes open. */
......@@ -1586,14 +1593,14 @@ static void setup_block_file(const char *filename)
verbose("device %u: virtblock %llu sectors\n",
devices.device_num, le64_to_cpu(conf.capacity));
}
/* That's the end of device setup. :*/
/* That's the end of device setup. */
/* Reboot */
/*L:230 Reboot is pretty easy: clean up and exec() the Launcher afresh. */
static void __attribute__((noreturn)) restart_guest(void)
{
unsigned int i;
/* Closing pipes causes the waker thread and io_threads to die, and
/* Closing pipes causes the Waker thread and io_threads to die, and
* closing /dev/lguest cleans up the Guest. Since we don't track all
* open fds, we simply close everything beyond stderr. */
for (i = 3; i < FD_SETSIZE; i++)
......@@ -1602,7 +1609,7 @@ static void __attribute__((noreturn)) restart_guest(void)
err(1, "Could not exec %s", main_args[0]);
}
/*L:220 Finally we reach the core of the Launcher, which runs the Guest, serves
/*L:220 Finally we reach the core of the Launcher which runs the Guest, serves
* its input and output, and finally, lays it to rest. */
static void __attribute__((noreturn)) run_guest(int lguest_fd)
{
......@@ -1643,7 +1650,7 @@ static void __attribute__((noreturn)) run_guest(int lguest_fd)
err(1, "Resetting break");
}
}
/*
/*L:240
* This is the end of the Launcher. The good news: we are over halfway
* through! The bad news: the most fiendish part of the code still lies ahead
* of us.
......@@ -1690,8 +1697,8 @@ int main(int argc, char *argv[])
* device receive input from a file descriptor, we keep an fdset
* (infds) and the maximum fd number (max_infd) with the head of the
* list. We also keep a pointer to the last device. Finally, we keep
* the next interrupt number to hand out (1: remember that 0 is used by
* the timer). */
* the next interrupt number to use for devices (1: remember that 0 is
* used by the timer). */
FD_ZERO(&devices.infds);
devices.max_infd = -1;
devices.lastdev = NULL;
......@@ -1792,8 +1799,8 @@ int main(int argc, char *argv[])
lguest_fd = tell_kernel(pgdir, start);
/* We fork off a child process, which wakes the Launcher whenever one
* of the input file descriptors needs attention. Otherwise we would
* run the Guest until it tries to output something. */
* of the input file descriptors needs attention. We call this the
* Waker, and we'll cover it in a moment. */
waker_fd = setup_waker(lguest_fd);
/* Finally, run the Guest. This doesn't return. */
......
This diff is collapsed.
......@@ -5,13 +5,20 @@
#include <asm/thread_info.h>
#include <asm/processor-flags.h>
/*G:020 This is where we begin: head.S notes that the boot header's platform
* type field is "1" (lguest), so calls us here.
/*G:020 Our story starts with the kernel booting into startup_32 in
* arch/x86/kernel/head_32.S. It expects a boot header, which is created by
* the bootloader (the Launcher in our case).
*
* The startup_32 function does very little: it clears the uninitialized global
* C variables which we expect to be zero (ie. BSS) and then copies the boot
* header and kernel command line somewhere safe. Finally it checks the
* 'hardware_subarch' field. This was introduced in 2.6.24 for lguest and Xen:
* if it's set to '1' (lguest's assigned number), then it calls us here.
*
* WARNING: be very careful here! We're running at addresses equal to physical
* addesses (around 0), not above PAGE_OFFSET as most code expectes
* (eg. 0xC0000000). Jumps are relative, so they're OK, but we can't touch any
* data.
* data without remembering to subtract __PAGE_OFFSET!
*
* The .section line puts this code in .init.text so it will be discarded after
* boot. */
......@@ -24,7 +31,7 @@ ENTRY(lguest_entry)
int $LGUEST_TRAP_ENTRY
/* The Host put the toplevel pagetable in lguest_data.pgdir. The movsl
* instruction uses %esi implicitly as the source for the copy we'
* instruction uses %esi implicitly as the source for the copy we're
* about to do. */
movl lguest_data - __PAGE_OFFSET + LGUEST_DATA_pgdir, %esi
......
/*P:400 This contains run_guest() which actually calls into the Host<->Guest
* Switcher and analyzes the return, such as determining if the Guest wants the
* Host to do something. This file also contains useful helper routines, and a
* couple of non-obvious setup and teardown pieces which were implemented after
* days of debugging pain. :*/
* Host to do something. This file also contains useful helper routines. :*/
#include <linux/module.h>
#include <linux/stringify.h>
#include <linux/stddef.h>
......@@ -49,8 +47,8 @@ static __init int map_switcher(void)
* easy.
*/
/* We allocate an array of "struct page"s. map_vm_area() wants the
* pages in this form, rather than just an array of pointers. */
/* We allocate an array of struct page pointers. map_vm_area() wants
* this, rather than just an array of pages. */
switcher_page = kmalloc(sizeof(switcher_page[0])*TOTAL_SWITCHER_PAGES,
GFP_KERNEL);
if (!switcher_page) {
......@@ -172,7 +170,7 @@ void __lgread(struct lg_cpu *cpu, void *b, unsigned long addr, unsigned bytes)
}
}
/* This is the write (copy into guest) version. */
/* This is the write (copy into Guest) version. */
void __lgwrite(struct lg_cpu *cpu, unsigned long addr, const void *b,
unsigned bytes)
{
......@@ -209,9 +207,9 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
if (cpu->break_out)
return -EAGAIN;
/* Check if there are any interrupts which can be delivered
* now: if so, this sets up the hander to be executed when we
* next run the Guest. */
/* Check if there are any interrupts which can be delivered now:
* if so, this sets up the hander to be executed when we next
* run the Guest. */
maybe_do_interrupt(cpu);
/* All long-lived kernel loops need to check with this horrible
......@@ -246,8 +244,10 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
lguest_arch_handle_trap(cpu);
}
/* Special case: Guest is 'dead' but wants a reboot. */
if (cpu->lg->dead == ERR_PTR(-ERESTART))
return -ERESTART;
/* The Guest is dead => "No such file or directory" */
return -ENOENT;
}
......
......@@ -29,7 +29,7 @@
#include "lg.h"
/*H:120 This is the core hypercall routine: where the Guest gets what it wants.
* Or gets killed. Or, in the case of LHCALL_CRASH, both. */
* Or gets killed. Or, in the case of LHCALL_SHUTDOWN, both. */
static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args)
{
switch (args->arg0) {
......@@ -190,6 +190,13 @@ static void initialize(struct lg_cpu *cpu)
* pagetable. */
guest_pagetable_clear_all(cpu);
}
/*:*/
/*M:013 If a Guest reads from a page (so creates a mapping) that it has never
* written to, and then the Launcher writes to it (ie. the output of a virtual
* device), the Guest will still see the old page. In practice, this never
* happens: why would the Guest read a page which it has never written to? But
* a similar scenario might one day bite us, so it's worth mentioning. :*/
/*H:100
* Hypercalls
......@@ -227,7 +234,7 @@ void do_hypercalls(struct lg_cpu *cpu)
* However, if we are signalled or the Guest sends I/O to the
* Launcher, the run_guest() loop will exit without running the
* Guest. When it comes back it would try to re-run the
* hypercall. */
* hypercall. Finding that bug sucked. */
cpu->hcall = NULL;
}
}
......
......@@ -144,7 +144,6 @@ void maybe_do_interrupt(struct lg_cpu *cpu)
if (copy_from_user(&blk, cpu->lg->lguest_data->blocked_interrupts,
sizeof(blk)))
return;
bitmap_andnot(blk, cpu->irqs_pending, blk, LGUEST_IRQS);
/* Find the first interrupt. */
......@@ -237,9 +236,9 @@ void free_interrupts(void)
clear_bit(syscall_vector, used_vectors);
}
/*H:220 Now we've got the routines to deliver interrupts, delivering traps
* like page fault is easy. The only trick is that Intel decided that some
* traps should have error codes: */
/*H:220 Now we've got the routines to deliver interrupts, delivering traps like
* page fault is easy. The only trick is that Intel decided that some traps
* should have error codes: */
static int has_err(unsigned int trap)
{
return (trap == 8 || (trap >= 10 && trap <= 14) || trap == 17);
......
/*P:050 Lguest guests use a very simple method to describe devices. It's a
* series of device descriptors contained just above the top of normal
* series of device descriptors contained just above the top of normal Guest
* memory.
*
* We use the standard "virtio" device infrastructure, which provides us with a
* console, a network and a block driver. Each one expects some configuration
* information and a "virtqueue" mechanism to send and receive data. :*/
* information and a "virtqueue" or two to send and receive data. :*/
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/lguest_launcher.h>
......@@ -53,7 +53,7 @@ struct lguest_device {
* Device configurations
*
* The configuration information for a device consists of one or more
* virtqueues, a feature bitmaks, and some configuration bytes. The
* virtqueues, a feature bitmap, and some configuration bytes. The
* configuration bytes don't really matter to us: the Launcher sets them up, and
* the driver will look at them during setup.
*
......@@ -179,7 +179,7 @@ struct lguest_vq_info
};
/* When the virtio_ring code wants to prod the Host, it calls us here and we
* make a hypercall. We hand the page number of the virtqueue so the Host
* make a hypercall. We hand the physical address of the virtqueue so the Host
* knows which virtqueue we're talking about. */
static void lg_notify(struct virtqueue *vq)
{
......@@ -199,7 +199,8 @@ static void lg_notify(struct virtqueue *vq)
* allocate its own pages and tell the Host where they are, but for lguest it's
* simpler for the Host to simply tell us where the pages are.
*
* So we provide devices with a "find virtqueue and set it up" function. */
* So we provide drivers with a "find the Nth virtqueue and set it up"
* function. */
static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
unsigned index,
void (*callback)(struct virtqueue *vq))
......
......@@ -73,7 +73,7 @@ static ssize_t read(struct file *file, char __user *user, size_t size,loff_t*o)
if (current != cpu->tsk)
return -EPERM;
/* If the guest is already dead, we indicate why */
/* If the Guest is already dead, we indicate why */
if (lg->dead) {
size_t len;
......@@ -88,7 +88,7 @@ static ssize_t read(struct file *file, char __user *user, size_t size,loff_t*o)
return len;
}
/* If we returned from read() last time because the Guest notified,
/* If we returned from read() last time because the Guest sent I/O,
* clear the flag. */
if (cpu->pending_notify)
cpu->pending_notify = 0;
......@@ -97,14 +97,20 @@ static ssize_t read(struct file *file, char __user *user, size_t size,loff_t*o)
return run_guest(cpu, (unsigned long __user *)user);
}
/*L:025 This actually initializes a CPU. For the moment, a Guest is only
* uniprocessor, so "id" is always 0. */
static int lg_cpu_start(struct lg_cpu *cpu, unsigned id, unsigned long start_ip)
{
/* We have a limited number the number of CPUs in the lguest struct. */
if (id >= NR_CPUS)
return -EINVAL;
/* Set up this CPU's id, and pointer back to the lguest struct. */
cpu->id = id;
cpu->lg = container_of((cpu - id), struct lguest, cpus[0]);
cpu->lg->nr_cpus++;
/* Each CPU has a timer it can set. */
init_clockdev(cpu);
/* We need a complete page for the Guest registers: they are accessible
......@@ -120,11 +126,11 @@ static int lg_cpu_start(struct lg_cpu *cpu, unsigned id, unsigned long start_ip)
* address. */
lguest_arch_setup_regs(cpu, start_ip);
/* Initialize the queue for the waker to wait on */
/* Initialize the queue for the Waker to wait on */
init_waitqueue_head(&cpu->break_wq);
/* We keep a pointer to the Launcher task (ie. current task) for when
* other Guests want to wake this one (inter-Guest I/O). */
* other Guests want to wake this one (eg. console input). */
cpu->tsk = current;
/* We need to keep a pointer to the Launcher's memory map, because if
......@@ -136,6 +142,7 @@ static int lg_cpu_start(struct lg_cpu *cpu, unsigned id, unsigned long start_ip)
* when the same Guest runs on the same CPU twice. */
cpu->last_pages = NULL;
/* No error == success. */
return 0;
}
......@@ -185,14 +192,13 @@ static int initialize(struct file *file, const unsigned long __user *input)
lg->mem_base = (void __user *)(long)args[0];
lg->pfn_limit = args[1];
/* This is the first cpu */
/* This is the first cpu (cpu 0) and it will start booting at args[3] */
err = lg_cpu_start(&lg->cpus[0], 0, args[3]);
if (err)
goto release_guest;
/* Initialize the Guest's shadow page tables, using the toplevel
* address the Launcher gave us. This allocates memory, so can
* fail. */
* address the Launcher gave us. This allocates memory, so can fail. */
err = init_guest_pagetable(lg, args[2]);
if (err)
goto free_regs;
......@@ -218,11 +224,16 @@ unlock:
/*L:010 The first operation the Launcher does must be a write. All writes
* start with an unsigned long number: for the first write this must be
* LHREQ_INITIALIZE to set up the Guest. After that the Launcher can use
* writes of other values to send interrupts. */
* writes of other values to send interrupts.
*
* Note that we overload the "offset" in the /dev/lguest file to indicate what
* CPU number we're dealing with. Currently this is always 0, since we only
* support uniprocessor Guests, but you can see the beginnings of SMP support
* here. */
static ssize_t write(struct file *file, const char __user *in,
size_t size, loff_t *off)
{
/* Once the guest is initialized, we hold the "struct lguest" in the
/* Once the Guest is initialized, we hold the "struct lguest" in the
* file private data. */
struct lguest *lg = file->private_data;
const unsigned long __user *input = (const unsigned long __user *)in;
......@@ -230,6 +241,7 @@ static ssize_t write(struct file *file, const char __user *in,
struct lg_cpu *uninitialized_var(cpu);
unsigned int cpu_id = *off;
/* The first value tells us what this request is. */
if (get_user(req, input) != 0)
return -EFAULT;
input++;
......
......@@ -2,8 +2,8 @@
* previous encounters. It's functional, and as neat as it can be in the
* circumstances, but be wary, for these things are subtle and break easily.
* The Guest provides a virtual to physical mapping, but we can neither trust
* it nor use it: we verify and convert it here to point the hardware to the
* actual Guest pages when running the Guest. :*/
* it nor use it: we verify and convert it here then point the CPU to the
* converted Guest pages when running the Guest. :*/
/* Copyright (C) Rusty Russell IBM Corporation 2006.
* GPL v2 and any later version */
......@@ -106,6 +106,11 @@ static unsigned long gpte_addr(pgd_t gpgd, unsigned long vaddr)
BUG_ON(!(pgd_flags(gpgd) & _PAGE_PRESENT));
return gpage + ((vaddr>>PAGE_SHIFT) % PTRS_PER_PTE) * sizeof(pte_t);
}
/*:*/
/*M:014 get_pfn is slow; it takes the mmap sem and calls get_user_pages. We
* could probably try to grab batches of pages here as an optimization
* (ie. pre-faulting). :*/
/*H:350 This routine takes a page number given by the Guest and converts it to
* an actual, physical page number. It can fail for several reasons: the
......@@ -113,8 +118,8 @@ static unsigned long gpte_addr(pgd_t gpgd, unsigned long vaddr)
* and the page is read-only, or the write flag was set and the page was
* shared so had to be copied, but we ran out of memory.
*
* This holds a reference to the page, so release_pte() is careful to
* put that back. */
* This holds a reference to the page, so release_pte() is careful to put that
* back. */
static unsigned long get_pfn(unsigned long virtpfn, int write)
{
struct page *page;
......@@ -532,13 +537,13 @@ static void do_set_pte(struct lg_cpu *cpu, int idx,
* all processes. So when the page table above that address changes, we update
* all the page tables, not just the current one. This is rare.
*
* The benefit is that when we have to track a new page table, we can copy keep
* all the kernel mappings. This speeds up context switch immensely. */
* The benefit is that when we have to track a new page table, we can keep all
* the kernel mappings. This speeds up context switch immensely. */
void guest_set_pte(struct lg_cpu *cpu,
unsigned long gpgdir, unsigned long vaddr, pte_t gpte)
{
/* Kernel mappings must be changed on all top levels. Slow, but
* doesn't happen often. */
/* Kernel mappings must be changed on all top levels. Slow, but doesn't
* happen often. */
if (vaddr >= cpu->lg->kernel_address) {
unsigned int i;
for (i = 0; i < ARRAY_SIZE(cpu->lg->pgdirs); i++)
......@@ -704,12 +709,11 @@ static __init void populate_switcher_pte_page(unsigned int cpu,
/* We've made it through the page table code. Perhaps our tired brains are
* still processing the details, or perhaps we're simply glad it's over.
*
* If nothing else, note that all this complexity in juggling shadow page
* tables in sync with the Guest's page tables is for one reason: for most
* Guests this page table dance determines how bad performance will be. This
* is why Xen uses exotic direct Guest pagetable manipulation, and why both
* Intel and AMD have implemented shadow page table support directly into
* hardware.
* If nothing else, note that all this complexity in juggling shadow page tables
* in sync with the Guest's page tables is for one reason: for most Guests this
* page table dance determines how bad performance will be. This is why Xen
* uses exotic direct Guest pagetable manipulation, and why both Intel and AMD
* have implemented shadow page table support directly into hardware.
*
* There is just one file remaining in the Host. */
......
......@@ -17,6 +17,13 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*P:450 This file contains the x86-specific lguest code. It used to be all
* mixed in with drivers/lguest/core.c but several foolhardy code slashers
* wrestled most of the dependencies out to here in preparation for porting
* lguest to other architectures (see what I mean by foolhardy?).
*
* This also contains a couple of non-obvious setup and teardown pieces which
* were implemented after days of debugging pain. :*/
#include <linux/kernel.h>
#include <linux/start_kernel.h>
#include <linux/string.h>
......@@ -157,6 +164,8 @@ static void run_guest_once(struct lg_cpu *cpu, struct lguest_pages *pages)
* also simplify copy_in_guest_info(). Note that we'd still need to restore
* things when we exit to Launcher userspace, but that's fairly easy.
*
* We could also try using this hooks for PGE, but that might be too expensive.
*
* The hooks were designed for KVM, but we can also put them to good use. :*/
/*H:040 This is the i386-specific code to setup and run the Guest. Interrupts
......@@ -182,7 +191,7 @@ void lguest_arch_run_guest(struct lg_cpu *cpu)
* was doing. */
run_guest_once(cpu, lguest_pages(raw_smp_processor_id()));
/* Note that the "regs" pointer contains two extra entries which are
/* Note that the "regs" structure contains two extra entries which are
* not really registers: a trap number which says what interrupt or
* trap made the switcher code come back, and an error code which some
* traps set. */
......@@ -293,11 +302,10 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu)
break;
case 14: /* We've intercepted a Page Fault. */
/* The Guest accessed a virtual address that wasn't mapped.
* This happens a lot: we don't actually set up most of the
* page tables for the Guest at all when we start: as it runs
* it asks for more and more, and we set them up as
* required. In this case, we don't even tell the Guest that
* the fault happened.
* This happens a lot: we don't actually set up most of the page
* tables for the Guest at all when we start: as it runs it asks
* for more and more, and we set them up as required. In this
* case, we don't even tell the Guest that the fault happened.
*
* The errcode tells whether this was a read or a write, and
* whether kernel or userspace code. */
......@@ -342,7 +350,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu)
if (!deliver_trap(cpu, cpu->regs->trapnum))
/* If the Guest doesn't have a handler (either it hasn't
* registered any yet, or it's one of the faults we don't let
* it handle), it dies with a cryptic error message. */
* it handle), it dies with this cryptic error message. */
kill_guest(cpu, "unhandled trap %li at %#lx (%#lx)",
cpu->regs->trapnum, cpu->regs->eip,
cpu->regs->trapnum == 14 ? cpu->arch.last_pagefault
......@@ -375,8 +383,8 @@ void __init lguest_arch_host_init(void)
* The only exception is the interrupt handlers in switcher.S: their
* addresses are placed in a table (default_idt_entries), so we need to
* update the table with the new addresses. switcher_offset() is a
* convenience function which returns the distance between the builtin
* switcher code and the high-mapped copy we just made. */
* convenience function which returns the distance between the
* compiled-in switcher code and the high-mapped copy we just made. */
for (i = 0; i < IDT_ENTRIES; i++)
default_idt_entries[i] += switcher_offset();
......@@ -416,7 +424,7 @@ void __init lguest_arch_host_init(void)
state->guest_gdt_desc.address = (long)&state->guest_gdt;
/* We know where we want the stack to be when the Guest enters
* the switcher: in pages->regs. The stack grows upwards, so
* the Switcher: in pages->regs. The stack grows upwards, so
* we start it at the end of that structure. */
state->guest_tss.sp0 = (long)(&pages->regs + 1);
/* And this is the GDT entry to use for the stack: we keep a
......@@ -513,8 +521,8 @@ int lguest_arch_init_hypercalls(struct lg_cpu *cpu)
{
u32 tsc_speed;
/* The pointer to the Guest's "struct lguest_data" is the only
* argument. We check that address now. */
/* The pointer to the Guest's "struct lguest_data" is the only argument.
* We check that address now. */
if (!lguest_address_ok(cpu->lg, cpu->hcall->arg1,
sizeof(*cpu->lg->lguest_data)))
return -EFAULT;
......@@ -546,6 +554,7 @@ int lguest_arch_init_hypercalls(struct lg_cpu *cpu)
return 0;
}
/*:*/
/*L:030 lguest_arch_setup_regs()
*
......
/*P:900 This is the Switcher: code which sits at 0xFFC00000 to do the low-level
* Guest<->Host switch. It is as simple as it can be made, but it's naturally
* very specific to x86.
/*P:900 This is the Switcher: code which sits at 0xFFC00000 astride both the
* Host and Guest to do the low-level Guest<->Host switch. It is as simple as
* it can be made, but it's naturally very specific to x86.
*
* You have now completed Preparation. If this has whet your appetite; if you
* are feeling invigorated and refreshed then the next, more challenging stage
......@@ -189,7 +189,7 @@ ENTRY(switch_to_guest)
// Interrupts are turned back on: we are Guest.
iret
// We treat two paths to switch back to the Host
// We tread two paths to switch back to the Host
// Yet both must save Guest state and restore Host
// So we put the routine in a macro.
#define SWITCH_TO_HOST \
......
......@@ -27,7 +27,7 @@
#ifndef __ASSEMBLY__
#include <asm/hw_irq.h>
/*G:031 First, how does our Guest contact the Host to ask for privileged
/*G:031 But first, how does our Guest contact the Host to ask for privileged
* operations? There are two ways: the direct way is to make a "hypercall",
* to make requests of the Host Itself.
*
......
......@@ -16,6 +16,10 @@
* a new device, we simply need to write a new virtio driver and create support
* for it in the Launcher: this code won't need to change.
*
* 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!
*
* Devices are described by a simplified ID, a status byte, and some "config"
* bytes which describe this device's configuration. This is placed by the
* Launcher just above the top of physical memory:
......@@ -26,7 +30,7 @@ struct lguest_device_desc {
/* The number of virtqueues (first in config array) */
__u8 num_vq;
/* The number of bytes of feature bits. Multiply by 2: one for host
* features and one for guest acknowledgements. */
* features and one for Guest acknowledgements. */
__u8 feature_len;
/* The number of bytes of the config array after virtqueues. */
__u8 config_len;
......
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