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Add -rtc-td-hack option to fix time drift with RTC on Windows (Gleb Natapov)

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After my last patch to fix interrupt coalescing was rejected
on the basis that it is too intrusive we decided to make the
fix much more localized and only fix the problem for RTC time
source. Unfortunately it is impossible to fix the problem entirely
inside RTC code like Andrzej proposed since Windows reads RTC
register C more then once on each time interrupt so it is impossible
to count reliably how many interrupt windows actually handled.
Proposed solution is localized to I386 target and is disabled by
default. To enable it "-rtc-td-hack" flag should be used.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6320 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-01-15 20:11:34 +00:00
parent 5fc1503efc
commit 73822ec806
6 changed files with 94 additions and 0 deletions
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7
vl.c
View file

@ -212,6 +212,7 @@ CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];
CharDriverState *virtcon_hds[MAX_VIRTIO_CONSOLES];
#ifdef TARGET_I386
int win2k_install_hack = 0;
int rtc_td_hack = 0;
#endif
int usb_enabled = 0;
int smp_cpus = 1;
@ -3878,6 +3879,7 @@ static void help(int exitcode)
"-full-screen start in full screen\n"
#ifdef TARGET_I386
"-win2k-hack use it when installing Windows 2000 to avoid a disk full bug\n"
"-rtc-td-hack use it to fix time drift in Windows ACPI HAL\n"
#endif
"-usb enable the USB driver (will be the default soon)\n"
"-usbdevice name add the host or guest USB device 'name'\n"
@ -4074,6 +4076,7 @@ enum {
QEMU_OPTION_kernel_kqemu,
QEMU_OPTION_enable_kvm,
QEMU_OPTION_win2k_hack,
QEMU_OPTION_rtc_td_hack,
QEMU_OPTION_usb,
QEMU_OPTION_usbdevice,
QEMU_OPTION_smp,
@ -4183,6 +4186,7 @@ static const QEMUOption qemu_options[] = {
#endif
{ "pidfile", HAS_ARG, QEMU_OPTION_pidfile },
{ "win2k-hack", 0, QEMU_OPTION_win2k_hack },
{ "rtc-td-hack", 0, QEMU_OPTION_rtc_td_hack },
{ "usbdevice", HAS_ARG, QEMU_OPTION_usbdevice },
{ "smp", HAS_ARG, QEMU_OPTION_smp },
{ "vnc", HAS_ARG, QEMU_OPTION_vnc },
@ -5011,6 +5015,9 @@ int main(int argc, char **argv, char **envp)
case QEMU_OPTION_win2k_hack:
win2k_install_hack = 1;
break;
case QEMU_OPTION_rtc_td_hack:
rtc_td_hack = 1;
break;
#endif
#ifdef USE_KQEMU
case QEMU_OPTION_no_kqemu: