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hyperv: Allow userland to ro-mmap reference TSC page
This paves way to implement VDSO for the enlightened time counter. Reviewed by: kib MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D8768
This commit is contained in:
Sepherosa Ziehau
parent
1de8c69de7
commit
9622c93ae8
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=310101
@ -185,6 +185,9 @@ copies: .PHONY .META
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${DESTDIR}${INCLUDEDIR}/dev/evdev; \
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${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 uinput.h \
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${DESTDIR}${INCLUDEDIR}/dev/evdev
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cd ${.CURDIR}/../sys/dev/hyperv/include; \
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${INSTALL} -C ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 444 hyperv.h \
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${DESTDIR}${INCLUDEDIR}/dev/hyperv
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cd ${.CURDIR}/../sys/dev/hyperv/utilities; \
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${INSTALL} -C ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 444 hv_snapshot.h \
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${DESTDIR}${INCLUDEDIR}/dev/hyperv
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@ -293,6 +296,11 @@ symlinks: .PHONY .META
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ln -fs ../../../../sys/dev/evdev/$$h \
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${DESTDIR}${INCLUDEDIR}/dev/evdev; \
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done
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cd ${.CURDIR}/../sys/dev/hyperv/include; \
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for h in hyperv.h; do \
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${INSTALL_SYMLINK} ${TAG_ARGS} ../../../../sys/dev/hyperv/include/$$h \
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${DESTDIR}${INCLUDEDIR}/dev/hyperv; \
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done
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cd ${.CURDIR}/../sys/dev/hyperv/utilities; \
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for h in hv_snapshot.h; do \
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${INSTALL_SYMLINK} ${TAG_ARGS} ../../../../sys/dev/hyperv/utilities/$$h \
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@ -31,10 +31,10 @@
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#ifndef _HYPERV_H_
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#define _HYPERV_H_
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#include <sys/param.h>
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#ifdef _KERNEL
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#define MSR_HV_TIME_REF_COUNT 0x40000020
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@ -54,14 +54,35 @@
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#define HYPERV_TIMER_NS_FACTOR 100ULL
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#define HYPERV_TIMER_FREQ (NANOSEC / HYPERV_TIMER_NS_FACTOR)
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#endif /* _KERNEL */
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#define HYPERV_REFTSC_DEVNAME "hv_tsc"
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/*
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* Hyper-V Reference TSC
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*/
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struct hyperv_reftsc {
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volatile uint32_t tsc_seq;
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volatile uint32_t tsc_rsvd1;
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volatile uint64_t tsc_scale;
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volatile int64_t tsc_ofs;
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} __packed __aligned(PAGE_SIZE);
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#ifdef CTASSERT
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CTASSERT(sizeof(struct hyperv_reftsc) == PAGE_SIZE);
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#endif
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#ifdef _KERNEL
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struct hyperv_guid {
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uint8_t hv_guid[16];
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uint8_t hv_guid[16];
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} __packed;
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#define HYPERV_GUID_STRLEN 40
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#define HYPERV_GUID_STRLEN 40
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int hyperv_guid2str(const struct hyperv_guid *, char *, size_t);
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extern u_int hyperv_features; /* CPUID_HV_MSR_ */
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#endif /* _KERNEL */
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#endif /* _HYPERV_H_ */
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@ -28,6 +28,8 @@
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/timetc.h>
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@ -35,6 +37,9 @@ __FBSDID("$FreeBSD$");
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#include <machine/cpufunc.h>
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#include <machine/cputypes.h>
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#include <machine/md_var.h>
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#include <machine/specialreg.h>
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#include <vm/vm.h>
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#include <dev/hyperv/include/hyperv.h>
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#include <dev/hyperv/include/hyperv_busdma.h>
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@ -47,6 +52,9 @@ struct hyperv_reftsc_ctx {
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struct hyperv_dma tsc_ref_dma;
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};
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static d_open_t hyperv_tsc_open;
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static d_mmap_t hyperv_tsc_mmap;
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static struct timecounter hyperv_tsc_timecounter = {
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.tc_get_timecount = NULL, /* based on CPU vendor. */
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.tc_poll_pps = NULL,
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@ -58,6 +66,13 @@ static struct timecounter hyperv_tsc_timecounter = {
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.tc_priv = NULL
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};
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static struct cdevsw hyperv_tsc_cdevsw = {
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.d_version = D_VERSION,
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.d_open = hyperv_tsc_open,
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.d_mmap = hyperv_tsc_mmap,
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.d_name = HYPERV_REFTSC_DEVNAME
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};
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static struct hyperv_reftsc_ctx hyperv_ref_tsc;
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uint64_t
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@ -72,6 +87,36 @@ hypercall_md(volatile void *hc_addr, uint64_t in_val,
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return (status);
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}
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static int
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hyperv_tsc_open(struct cdev *dev __unused, int oflags, int devtype __unused,
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struct thread *td __unused)
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{
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if (oflags & FWRITE)
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return (EPERM);
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return (0);
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}
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static int
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hyperv_tsc_mmap(struct cdev *dev __unused, vm_ooffset_t offset,
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vm_paddr_t *paddr, int nprot __unused, vm_memattr_t *memattr __unused)
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{
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KASSERT(hyperv_ref_tsc.tsc_ref != NULL, ("reftsc has not been setup"));
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/*
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* NOTE:
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* 'nprot' does not contain information interested to us;
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* WR-open is blocked by d_open.
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*/
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if (offset != 0)
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return (EOPNOTSUPP);
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*paddr = hyperv_ref_tsc.tsc_ref_dma.hv_paddr;
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return (0);
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}
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#define HYPERV_TSC_TIMECOUNT(fence) \
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static u_int \
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hyperv_tsc_timecount_##fence(struct timecounter *tc) \
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@ -150,6 +195,10 @@ hyperv_tsc_tcinit(void *dummy __unused)
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/* Register "enlightened" timecounter. */
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tc_init(&hyperv_tsc_timecounter);
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/* Add device for mmap(2). */
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make_dev(&hyperv_tsc_cdevsw, 0, UID_ROOT, GID_WHEEL, 0444,
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HYPERV_REFTSC_DEVNAME);
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}
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SYSINIT(hyperv_tsc_init, SI_SUB_DRIVERS, SI_ORDER_FIRST, hyperv_tsc_tcinit,
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NULL);
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@ -128,17 +128,6 @@
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#define CPUID_LEAF_HV_LIMITS 0x40000005
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#define CPUID_LEAF_HV_HWFEATURES 0x40000006
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/*
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* Hyper-V Reference TSC
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*/
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struct hyperv_reftsc {
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volatile uint32_t tsc_seq;
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volatile uint32_t tsc_rsvd1;
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volatile uint64_t tsc_scale;
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volatile int64_t tsc_ofs;
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} __packed __aligned(PAGE_SIZE);
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CTASSERT(sizeof(struct hyperv_reftsc) == PAGE_SIZE);
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/*
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* Hyper-V Monitor Notification Facility
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*/
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