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kvm tools: Emulate RTC to fix system time in guests

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This patch fixes system time in guests by implementing proper CMOS RTC clock
support.

  # Before:

  sh-2.05b# date
  Fri Aug  7 04:02:01 UTC 2009

  # After:

  sh-2.05b# date
  Thu Apr 28 19:12:21 UTC 2011

Cc: Asias He <asias.hejun@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Prasad Joshi <prasadjoshi124@gmail.com>
Cc: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Pekka Enberg
2015-06-01 16:39:43 +01:00
committed by Will Deacon
parent 8e5accedb8
commit 64136c1c52
5 changed files with 101 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Makefile
+5 -4
View File
@@ -26,12 +26,13 @@ OBJS += kvm-cpu.o
OBJS += main.o
OBJS += mmio.o
OBJS += pci.o
OBJS += util.o
OBJS += rtc.o
OBJS += term.o
OBJS += util.o
OBJS += virtio.o
OBJS += util/parse-options.o
OBJS += util/strbuf.o
OBJS += kvm-help.o
OBJS += util/parse-options.o
OBJS += util/strbuf.o
OBJS += kvm-help.o
OBJS += kvm-cmd.o
OBJS += kvm-run.o
OBJS += qcow.o
include/kvm/rtc.h
+6
View File
@@ -0,0 +1,6 @@
#ifndef KVM__RTC_H
#define KVM__RTC_H
void rtc__init(void);
#endif /* KVM__RTC_H */
ioport.c
-26
View File
@@ -12,28 +12,6 @@
bool ioport_debug;
static uint8_t ioport_to_uint8(void *data)
{
uint8_t *p = data;
return *p;
}
static bool cmos_ram_rtc_io_out(struct kvm *self, uint16_t port, void *data, int size, uint32_t count)
{
uint8_t value;
value = ioport_to_uint8(data);
self->nmi_disabled = value & (1UL << 7);
return true;
}
static struct ioport_operations cmos_ram_rtc_ops = {
.io_out = cmos_ram_rtc_io_out,
};
static bool debug_io_out(struct kvm *self, uint16_t port, void *data, int size, uint32_t count)
{
exit(EXIT_SUCCESS);
@@ -128,10 +106,6 @@ void ioport__setup_legacy(void)
ioport__register(0x0060, &dummy_read_write_ioport_ops, 2);
ioport__register(0x0064, &dummy_read_write_ioport_ops, 1);
/* PORT 0070-007F - CMOS RAM/RTC (REAL TIME CLOCK) */
ioport__register(0x0070, &cmos_ram_rtc_ops, 1);
ioport__register(0x0071, &dummy_read_write_ioport_ops, 1);
/* 0x00A0 - 0x00AF - 8259A PIC 2 */
ioport__register(0x00A0, &dummy_read_write_ioport_ops, 2);
kvm-run.c
+3
View File
@@ -22,6 +22,7 @@
#include <kvm/disk-image.h>
#include <kvm/util.h>
#include <kvm/pci.h>
#include <kvm/rtc.h>
#include <kvm/term.h>
#include <kvm/ioport.h>
#include <kvm/threadpool.h>
@@ -416,6 +417,8 @@ int kvm_cmd_run(int argc, const char **argv, const char *prefix)
ioport__setup_legacy();
rtc__init();
kvm__setup_bios(kvm);
serial8250__init(kvm);
rtc.c
+87
View File
@@ -0,0 +1,87 @@
#include "kvm/rtc.h"
#include "kvm/ioport.h"
#include "kvm/kvm.h"
#include <time.h>
static uint8_t cmos_index;
#define CMOS_RTC_SECONDS 0x00
#define CMOS_RTC_MINUTES 0x02
#define CMOS_RTC_HOURS 0x04
#define CMOS_RTC_DATE_OF_MONTH 0x07
#define CMOS_RTC_MONTH 0x08
#define CMOS_RTC_YEAR 0x09
static inline unsigned char bin2bcd(unsigned val)
{
return ((val / 10) << 4) + val % 10;
}
static bool cmos_ram_data_in(struct kvm *self, uint16_t port, void *data, int size, uint32_t count)
{
struct tm *tm;
time_t ti;
time(&ti);
tm = gmtime(&ti);
switch (cmos_index) {
case CMOS_RTC_SECONDS:
ioport__write8(data, bin2bcd(tm->tm_sec));
break;
case CMOS_RTC_MINUTES:
ioport__write8(data, bin2bcd(tm->tm_min));
break;
case CMOS_RTC_HOURS:
ioport__write8(data, bin2bcd(tm->tm_hour));
break;
case CMOS_RTC_DATE_OF_MONTH:
ioport__write8(data, bin2bcd(tm->tm_mday));
break;
case CMOS_RTC_MONTH:
ioport__write8(data, bin2bcd(tm->tm_mon + 1));
break;
case CMOS_RTC_YEAR:
ioport__write8(data, bin2bcd(tm->tm_year));
break;
}
return true;
}
static bool cmos_ram_data_out(struct kvm *self, uint16_t port, void *data, int size, uint32_t count)
{
return true;
}
static struct ioport_operations cmos_ram_data_ioport_ops = {
.io_out = cmos_ram_data_out,
.io_in = cmos_ram_data_in,
};
static bool cmos_ram_index_out(struct kvm *self, uint16_t port, void *data, int size, uint32_t count)
{
uint8_t value;
value = ioport__read8(data);
self->nmi_disabled = value & (1UL << 7);
cmos_index = value & ~(1UL << 7);
return true;
}
static struct ioport_operations cmos_ram_index_ioport_ops = {
.io_out = cmos_ram_index_out,
};
void rtc__init(void)
{
/* PORT 0070-007F - CMOS RAM/RTC (REAL TIME CLOCK) */
ioport__register(0x0070, &cmos_ram_index_ioport_ops, 1);
ioport__register(0x0071, &cmos_ram_data_ioport_ops, 1);
}