Replace bhyve's minimal RTC emulation with a fully featured one in vmm.ko.

The new RTC emulation supports all interrupt modes: periodic, update ended
and alarm. It is also capable of maintaining the date/time and NVRAM contents
across virtual machine reset. Also, the date/time fields can now be modified
by the guest.

Since bhyve now emulates both the PIT and the RTC there is no need for
"Legacy Replacement Routing" in the HPET so get rid of it.

The RTC device state can be inspected via bhyvectl as follows:
bhyvectl --vm=vm --get-rtc-time
bhyvectl --vm=vm --set-rtc-time=<unix_time_secs>
bhyvectl --vm=vm --rtc-nvram-offset=<offset> --get-rtc-nvram
bhyvectl --vm=vm --rtc-nvram-offset=<offset> --set-rtc-nvram=<value>

Reviewed by:	tychon
Discussed with:	grehan
Differential Revision:	https://reviews.freebsd.org/D1385
MFC after:	2 weeks

1 files changed, 15 insertions, 0 deletions

diff --git a/sys/amd64/vmm/vmm.c b/sys/amd64/vmm/vmm.c
index d9cb6f3c1254..6c55271f4269 100644
--- a/sys/amd64/vmm/vmm.c
+++ b/sys/amd64/vmm/vmm.c
@@ -75,6 +75,7 @@ __FBSDID("$FreeBSD$");
 #include "vioapic.h"
 #include "vlapic.h"
 #include "vpmtmr.h"
+#include "vrtc.h"
 #include "vmm_ipi.h"
 #include "vmm_stat.h"
 #include "vmm_lapic.h"
@@ -136,6 +137,7 @@ struct vm {
 	struct vatpic	*vatpic;		/* (i) virtual atpic */
 	struct vatpit	*vatpit;		/* (i) virtual atpit */
 	struct vpmtmr	*vpmtmr;		/* (i) virtual ACPI PM timer */
+	struct vrtc	*vrtc;			/* (o) virtual RTC */
 	volatile cpuset_t active_cpus;		/* (i) active vcpus */
 	int		suspend;		/* (i) stop VM execution */
 	volatile cpuset_t suspended_cpus; 	/* (i) suspended vcpus */
@@ -375,6 +377,8 @@ vm_init(struct vm *vm, bool create)
 	vm->vatpic = vatpic_init(vm);
 	vm->vatpit = vatpit_init(vm);
 	vm->vpmtmr = vpmtmr_init(vm);
+	if (create)
+		vm->vrtc = vrtc_init(vm);
 
 	CPU_ZERO(&vm->active_cpus);
 
@@ -437,6 +441,10 @@ vm_cleanup(struct vm *vm, bool destroy)
 	if (vm->iommu != NULL)
 		iommu_destroy_domain(vm->iommu);
 
+	if (destroy)
+		vrtc_cleanup(vm->vrtc);
+	else
+		vrtc_reset(vm->vrtc);
 	vpmtmr_cleanup(vm->vpmtmr);
 	vatpit_cleanup(vm->vatpit);
 	vhpet_cleanup(vm->vhpet);
@@ -2222,6 +2230,13 @@ vm_pmtmr(struct vm *vm)
 	return (vm->vpmtmr);
 }
 
+struct vrtc *
+vm_rtc(struct vm *vm)
+{
+
+	return (vm->vrtc);
+}
+
 enum vm_reg_name
 vm_segment_name(int seg)
 {