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lguest: write more information to userspace about pending traps.

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This is preparation for userspace handling MMIO and ioport accesses.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2015-02-11 15:15:09 +10:30
parent 18c137371b
commit 69a09dc174
6 changed files with 42 additions and 18 deletions
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16
tools/lguest/lguest.c
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@@ -1820,17 +1820,21 @@ static void __attribute__((noreturn)) restart_guest(void)
static void __attribute__((noreturn)) run_guest(void)
{
for (;;) {
unsigned long notify_addr;
struct lguest_pending notify;
int readval;
/* We read from the /dev/lguest device to run the Guest. */
readval = pread(lguest_fd, &notify_addr,
sizeof(notify_addr), cpu_id);
readval = pread(lguest_fd, &notify, sizeof(notify), cpu_id);
/* One unsigned long means the Guest did HCALL_NOTIFY */
if (readval == sizeof(notify_addr)) {
verbose("Notify on address %#lx\n", notify_addr);
handle_output(notify_addr);
if (readval == sizeof(notify)) {
if (notify.trap == 0x1F) {
verbose("Notify on address %#08x\n",
notify.addr);
handle_output(notify.addr);
} else
errx(1, "Unknown trap %i addr %#08x\n",
notify.trap, notify.addr);
/* ENOENT means the Guest died. Reading tells us why. */
} else if (errno == ENOENT) {
char reason[1024] = { 0 };