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hv: add Service VM write physical RTC register

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Service VM write physical RTC register.
Both RTC time modify and Configuration register is available.

Tracked-On: #7440
Signed-off-by: Yuanyuan Zhao <yuanyuan.zhao@linux.intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
This commit is contained in:
Yuanyuan Zhao 2022-04-25 14:45:37 +08:00 committed by acrnsi-robot
parent dfdf79ffa9
commit bca21648a3
1 changed files with 25 additions and 1 deletions
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26
hypervisor/dm/vrtc.c
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@ -395,6 +395,12 @@ static uint8_t cmos_read(uint8_t addr)
return pio_read8(CMOS_DATA_PORT); return pio_read8(CMOS_DATA_PORT);
} }
static void cmos_write(uint8_t addr, uint8_t value)
{
pio_write8(addr, CMOS_ADDR_PORT);
pio_write8(value, CMOS_DATA_PORT);
}
static bool cmos_update_in_progress(void) static bool cmos_update_in_progress(void)
{ {
return (cmos_read(RTC_STATUSA) & RTCSA_TUP) ? 1 : 0; return (cmos_read(RTC_STATUSA) & RTCSA_TUP) ? 1 : 0;
@ -418,6 +424,22 @@ static uint8_t cmos_get_reg_val(uint8_t addr)
return reg; return reg;
} }
static void cmos_set_reg_val(uint8_t addr, uint8_t value)
{
int32_t tries = 2000;
spinlock_obtain(&cmos_lock);
/* Make sure an update isn't in progress */
while (cmos_update_in_progress() && (tries != 0)) {
tries -= 1;
}
cmos_write(addr, value);
spinlock_release(&cmos_lock);
}
#define TRIGGER_ALARM (RTCIR_ALARM | RTCIR_INT) #define TRIGGER_ALARM (RTCIR_ALARM | RTCIR_INT)
#define RTC_DELTA 1 /* For RTC and system time may out of sync for no more than 1s */ #define RTC_DELTA 1 /* For RTC and system time may out of sync for no more than 1s */
static inline bool rtc_halted(struct acrn_vrtc *rtc) static inline bool rtc_halted(struct acrn_vrtc *rtc)
@ -510,7 +532,9 @@ static bool vrtc_write(struct acrn_vcpu *vcpu, uint16_t addr, size_t width,
if ((width == 1U) && (addr == CMOS_ADDR_PORT)) { if ((width == 1U) && (addr == CMOS_ADDR_PORT)) {
vrtc->addr = (uint8_t)(value & 0x7FU); vrtc->addr = (uint8_t)(value & 0x7FU);
} else { } else {
if (!is_service_vm(vcpu->vm)) { if (is_service_vm(vcpu->vm)) {
cmos_set_reg_val(vrtc->addr, (uint8_t)(value & 0xFFU));
} else {
switch (vrtc->addr) { switch (vrtc->addr) {
case RTC_STATUSA: case RTC_STATUSA:
case RTC_INTR: case RTC_INTR: