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[Qemu-devel] Re: Windows 2000 disk full problem during install...
From: |
Vladimir N. Oleynik |
Subject: |
[Qemu-devel] Re: Windows 2000 disk full problem during install... |
Date: |
Fri, 17 Dec 2004 14:23:38 +0300 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040117 |
Leo,
> I was wondering if anyone had a chance to look into this problem more.
> I've done a great deal of research myself on it so far, but do not yet have
> a solution. Most of the c:\winnt\security\edb*.log files that fill up the disk
> are created during the hardware scan stage in the GUI portion of the install.
> I'm using Windows 2000 Professional, on QEMU 0.6.2 (latest from CVS) and have
> encountered the problem on any flavor of Linux I try.
> I also tried a small patch to hw/ide.c (without the multithread bits),
> from Vladimir N. Oleynik. Basically only the s->status is set to READY_STAT
> instead of READY_STAT | SEEK_STAT in/around hw/ide.c:1472 from that patch.
> This did not solve the problem at all.
O my God!
This problem consists not in these flags, you looked corrections
to the previous version of the ide emulator.
I have made new hack specially for elimination of a Subject problem only.
This correction adds waiting one (or zero, autorandomly) period before
sending interruption after positioning before write. (see attach)
But this a HACK, do not use after w2k install!
Me other idea interested - to make asynchronous input-output.
The received effect of elimination of a Subject problem was
completely unexpected.
But the author of the QEmu has not supported idea.
(The sended a patch do not contain asynchronous input-output.)
--w
vodz
diff -rbu qemu.orig/hw/ide.c qemu/hw/ide.c
--- qemu.orig/hw/ide.c 2004-12-02 23:20:21.000000000 +0300
+++ qemu/hw/ide.c 2004-12-17 14:06:15.000000000 +0300
@@ -332,8 +332,12 @@
uint8_t *data_ptr;
uint8_t *data_end;
uint8_t io_buffer[MAX_MULT_SECTORS*512 + 4];
+ int ide_set_irq_from_timer;
} IDEState;
+volatile int ide_set_irq_from_timer;
+static IDEState *IDEStates[4];
+
#define BM_STATUS_DMAING 0x01
#define BM_STATUS_ERROR 0x02
#define BM_STATUS_INT 0x04
@@ -512,6 +516,21 @@
}
}
+void make_ide_set_irq(void)
+{
+ int i;
+ IDEState *s;
+
+ ide_set_irq_from_timer--;
+ for(i = 0; (s=IDEStates[i]) != NULL; i++) {
+ if(s->ide_set_irq_from_timer) {
+ s->ide_set_irq_from_timer--;
+ ide_set_irq(s);
+ break;
+ }
+ }
+}
+
/* prepare data transfer and tell what to do after */
static void ide_transfer_start(IDEState *s, uint8_t *buf, int size,
EndTransferFunc *end_transfer_func)
@@ -667,7 +686,11 @@
ide_transfer_start(s, s->io_buffer, 512 * n1, ide_sector_write);
}
ide_set_sector(s, sector_num + n);
+ if(s->ide_set_irq_from_timer) {
+ ide_set_irq_from_timer++;
+ } else {
ide_set_irq(s);
+ }
}
static int ide_write_dma_cb(IDEState *s,
@@ -1511,6 +1534,7 @@
s->error = 0;
s->status = SEEK_STAT | READY_STAT;
s->req_nb_sectors = 1;
+ s->ide_set_irq_from_timer = 1;
ide_transfer_start(s, s->io_buffer, 512, ide_sector_write);
break;
case WIN_MULTREAD:
@@ -1528,6 +1552,7 @@
n = s->nsector;
if (n > s->req_nb_sectors)
n = s->req_nb_sectors;
+ s->ide_set_irq_from_timer = 1;
ide_transfer_start(s, s->io_buffer, 512 * n, ide_sector_write);
break;
case WIN_READDMA:
@@ -1883,6 +1908,7 @@
for(i = 0; i < 2; i++) {
s = ide_state + i;
+ IDEStates[drive_serial-1] = s;
if (i == 0)
s->bs = hd0;
else
diff -rbu qemu.orig/vl.c qemu/vl.c
--- qemu.orig/vl.c 2004-12-13 01:20:04.000000000 +0300
+++ qemu/vl.c 2004-12-17 12:41:16.000000000 +0300
@@ -911,7 +911,7 @@
/* timer signal */
sigfillset(&act.sa_mask);
- act.sa_flags = 0;
+ act.sa_flags = SA_RESTART;
#if defined (TARGET_I386) && defined(USE_CODE_COPY)
act.sa_flags |= SA_ONSTACK;
#endif
@@ -2403,7 +2403,12 @@
int n, max_size;
#endif
int ret;
+ /* ide.c hack */
+ extern volatile int ide_set_irq_from_timer;
+ extern void make_ide_set_irq(void);
+ if(ide_set_irq_from_timer)
+ make_ide_set_irq();
#ifdef _WIN32
if (timeout > 0)
Sleep(timeout);
@@ -2449,8 +2454,6 @@
n = read(ioh->fd, buf, ioh->max_size);
if (n >= 0) {
ioh->fd_read(ioh->opaque, buf, n);
- } else if (errno != EAGAIN) {
- ioh->fd_read(ioh->opaque, NULL, -errno);
}
}
}
- [Qemu-devel] Re: Windows 2000 disk full problem during install...,
Vladimir N. Oleynik <=