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vmm.c
8627 lines (7691 loc) · 226 KB
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vmm.c
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/* $OpenBSD: vmm.c,v 1.251 2019/07/30 06:21:23 mlarkin Exp $ */
/*
* Copyright (c) 2014 Mike Larkin <mlarkin@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/rwlock.h>
#include <sys/pledge.h>
#include <sys/memrange.h>
#include <sys/timetc.h>
#include <uvm/uvm_extern.h>
#include <machine/fpu.h>
#include <machine/pmap.h>
#include <machine/biosvar.h>
#include <machine/segments.h>
#include <machine/cpufunc.h>
#include <machine/vmmvar.h>
#include <dev/isa/isareg.h>
#include <dev/pv/pvreg.h>
/* #define VMM_DEBUG */
void *l1tf_flush_region;
#ifdef VMM_DEBUG
#define DPRINTF(x...) do { printf(x); } while(0)
#else
#define DPRINTF(x...)
#endif /* VMM_DEBUG */
#define DEVNAME(s) ((s)->sc_dev.dv_xname)
#define CTRL_DUMP(x,y,z) printf(" %s: Can set:%s Can clear:%s\n", #z , \
vcpu_vmx_check_cap(x, IA32_VMX_##y ##_CTLS, \
IA32_VMX_##z, 1) ? "Yes" : "No", \
vcpu_vmx_check_cap(x, IA32_VMX_##y ##_CTLS, \
IA32_VMX_##z, 0) ? "Yes" : "No");
#define VMX_EXIT_INFO_HAVE_RIP 0x1
#define VMX_EXIT_INFO_HAVE_REASON 0x2
#define VMX_EXIT_INFO_COMPLETE \
(VMX_EXIT_INFO_HAVE_RIP | VMX_EXIT_INFO_HAVE_REASON)
struct vm {
vm_map_t vm_map;
uint32_t vm_id;
pid_t vm_creator_pid;
size_t vm_nmemranges;
size_t vm_memory_size;
char vm_name[VMM_MAX_NAME_LEN];
struct vm_mem_range vm_memranges[VMM_MAX_MEM_RANGES];
struct vcpu_head vm_vcpu_list;
uint32_t vm_vcpu_ct;
u_int vm_vcpus_running;
struct rwlock vm_vcpu_lock;
SLIST_ENTRY(vm) vm_link;
};
SLIST_HEAD(vmlist_head, vm);
struct vmm_softc {
struct device sc_dev;
/* Capabilities */
uint32_t nr_vmx_cpus;
uint32_t nr_svm_cpus;
uint32_t nr_rvi_cpus;
uint32_t nr_ept_cpus;
/* Managed VMs */
struct vmlist_head vm_list;
int mode;
struct rwlock vm_lock;
size_t vm_ct; /* number of in-memory VMs */
size_t vm_idx; /* next unique VM index */
struct rwlock vpid_lock;
uint16_t max_vpid;
uint8_t vpids[512]; /* bitmap of used VPID/ASIDs */
};
void vmx_dump_vmcs_field(uint16_t, const char *);
int vmm_enabled(void);
int vmm_probe(struct device *, void *, void *);
void vmm_attach(struct device *, struct device *, void *);
int vmmopen(dev_t, int, int, struct proc *);
int vmmioctl(dev_t, u_long, caddr_t, int, struct proc *);
int vmmclose(dev_t, int, int, struct proc *);
int vmm_start(void);
int vmm_stop(void);
size_t vm_create_check_mem_ranges(struct vm_create_params *);
int vm_create(struct vm_create_params *, struct proc *);
int vm_run(struct vm_run_params *);
int vm_terminate(struct vm_terminate_params *);
int vm_get_info(struct vm_info_params *);
int vm_resetcpu(struct vm_resetcpu_params *);
int vm_intr_pending(struct vm_intr_params *);
int vm_rwregs(struct vm_rwregs_params *, int);
int vm_rwvmparams(struct vm_rwvmparams_params *, int);
int vm_find(uint32_t, struct vm **);
int vcpu_readregs_vmx(struct vcpu *, uint64_t, struct vcpu_reg_state *);
int vcpu_readregs_svm(struct vcpu *, uint64_t, struct vcpu_reg_state *);
int vcpu_writeregs_vmx(struct vcpu *, uint64_t, int, struct vcpu_reg_state *);
int vcpu_writeregs_svm(struct vcpu *, uint64_t, struct vcpu_reg_state *);
int vcpu_reset_regs(struct vcpu *, struct vcpu_reg_state *);
int vcpu_reset_regs_vmx(struct vcpu *, struct vcpu_reg_state *);
int vcpu_reset_regs_svm(struct vcpu *, struct vcpu_reg_state *);
int vcpu_reload_vmcs_vmx(uint64_t *);
int vcpu_init(struct vcpu *);
int vcpu_init_vmx(struct vcpu *);
int vcpu_init_svm(struct vcpu *);
int vcpu_must_stop(struct vcpu *);
int vcpu_run_vmx(struct vcpu *, struct vm_run_params *);
int vcpu_run_svm(struct vcpu *, struct vm_run_params *);
void vcpu_deinit(struct vcpu *);
void vcpu_deinit_vmx(struct vcpu *);
void vcpu_deinit_svm(struct vcpu *);
int vm_impl_init(struct vm *, struct proc *);
int vm_impl_init_vmx(struct vm *, struct proc *);
int vm_impl_init_svm(struct vm *, struct proc *);
void vm_impl_deinit(struct vm *);
void vm_impl_deinit_vmx(struct vm *);
void vm_impl_deinit_svm(struct vm *);
void vm_teardown(struct vm *);
int vcpu_vmx_check_cap(struct vcpu *, uint32_t, uint32_t, int);
int vcpu_vmx_compute_ctrl(uint64_t, uint16_t, uint32_t, uint32_t, uint32_t *);
int vmx_get_exit_info(uint64_t *, uint64_t *);
int vmx_load_pdptes(struct vcpu *);
int vmx_handle_exit(struct vcpu *);
int svm_handle_exit(struct vcpu *);
int svm_handle_msr(struct vcpu *);
int vmm_handle_xsetbv(struct vcpu *, uint64_t *);
int vmx_handle_xsetbv(struct vcpu *);
int svm_handle_xsetbv(struct vcpu *);
int vmm_handle_cpuid(struct vcpu *);
int vmx_handle_rdmsr(struct vcpu *);
int vmx_handle_wrmsr(struct vcpu *);
int vmx_handle_cr0_write(struct vcpu *, uint64_t);
int vmx_handle_cr4_write(struct vcpu *, uint64_t);
int vmx_handle_cr(struct vcpu *);
int svm_handle_inout(struct vcpu *);
int vmx_handle_inout(struct vcpu *);
int svm_handle_hlt(struct vcpu *);
int vmx_handle_hlt(struct vcpu *);
int vmm_inject_ud(struct vcpu *);
int vmm_inject_gp(struct vcpu *);
int vmm_inject_db(struct vcpu *);
void vmx_handle_intr(struct vcpu *);
void vmx_handle_intwin(struct vcpu *);
void vmx_handle_misc_enable_msr(struct vcpu *);
int vmm_get_guest_memtype(struct vm *, paddr_t);
int vmm_get_guest_faulttype(void);
int vmx_get_guest_faulttype(void);
int svm_get_guest_faulttype(struct vmcb *);
int vmx_get_exit_qualification(uint64_t *);
int vmm_get_guest_cpu_cpl(struct vcpu *);
int vmm_get_guest_cpu_mode(struct vcpu *);
int svm_fault_page(struct vcpu *, paddr_t);
int vmx_fault_page(struct vcpu *, paddr_t);
int vmx_handle_np_fault(struct vcpu *);
int svm_handle_np_fault(struct vcpu *);
int vmm_alloc_vpid(uint16_t *);
void vmm_free_vpid(uint16_t);
const char *vcpu_state_decode(u_int);
const char *vmx_exit_reason_decode(uint32_t);
const char *svm_exit_reason_decode(uint32_t);
const char *vmx_instruction_error_decode(uint32_t);
void svm_setmsrbr(struct vcpu *, uint32_t);
void svm_setmsrbw(struct vcpu *, uint32_t);
void svm_setmsrbrw(struct vcpu *, uint32_t);
void vmx_setmsrbr(struct vcpu *, uint32_t);
void vmx_setmsrbw(struct vcpu *, uint32_t);
void vmx_setmsrbrw(struct vcpu *, uint32_t);
void svm_set_clean(struct vcpu *, uint32_t);
void svm_set_dirty(struct vcpu *, uint32_t);
void vmm_init_pvclock(struct vcpu *, paddr_t);
int vmm_update_pvclock(struct vcpu *);
#ifdef VMM_DEBUG
void dump_vcpu(struct vcpu *);
void vmx_vcpu_dump_regs(struct vcpu *);
void vmx_dump_vmcs(struct vcpu *);
const char *msr_name_decode(uint32_t);
void vmm_segment_desc_decode(uint64_t);
void vmm_decode_cr0(uint64_t);
void vmm_decode_cr3(uint64_t);
void vmm_decode_cr4(uint64_t);
void vmm_decode_msr_value(uint64_t, uint64_t);
void vmm_decode_apicbase_msr_value(uint64_t);
void vmm_decode_ia32_fc_value(uint64_t);
void vmm_decode_mtrrcap_value(uint64_t);
void vmm_decode_perf_status_value(uint64_t);
void vmm_decode_perf_ctl_value(uint64_t);
void vmm_decode_mtrrdeftype_value(uint64_t);
void vmm_decode_efer_value(uint64_t);
void vmm_decode_rflags(uint64_t);
void vmm_decode_misc_enable_value(uint64_t);
const char *vmm_decode_cpu_mode(struct vcpu *);
extern int mtrr2mrt(int);
struct vmm_reg_debug_info {
uint64_t vrdi_bit;
const char *vrdi_present;
const char *vrdi_absent;
};
#endif /* VMM_DEBUG */
extern uint64_t tsc_frequency;
extern int tsc_is_invariant;
const char *vmm_hv_signature = VMM_HV_SIGNATURE;
const struct kmem_pa_mode vmm_kp_contig = {
.kp_constraint = &no_constraint,
.kp_maxseg = 1,
.kp_align = 4096,
.kp_zero = 1,
};
struct cfdriver vmm_cd = {
NULL, "vmm", DV_DULL
};
const struct cfattach vmm_ca = {
sizeof(struct vmm_softc), vmm_probe, vmm_attach, NULL, NULL
};
/*
* Helper struct to easily get the VMCS field IDs needed in vmread/vmwrite
* to access the individual fields of the guest segment registers. This
* struct is indexed by VCPU_REGS_* id.
*/
const struct {
uint64_t selid;
uint64_t limitid;
uint64_t arid;
uint64_t baseid;
} vmm_vmx_sreg_vmcs_fields[] = {
{ VMCS_GUEST_IA32_CS_SEL, VMCS_GUEST_IA32_CS_LIMIT,
VMCS_GUEST_IA32_CS_AR, VMCS_GUEST_IA32_CS_BASE },
{ VMCS_GUEST_IA32_DS_SEL, VMCS_GUEST_IA32_DS_LIMIT,
VMCS_GUEST_IA32_DS_AR, VMCS_GUEST_IA32_DS_BASE },
{ VMCS_GUEST_IA32_ES_SEL, VMCS_GUEST_IA32_ES_LIMIT,
VMCS_GUEST_IA32_ES_AR, VMCS_GUEST_IA32_ES_BASE },
{ VMCS_GUEST_IA32_FS_SEL, VMCS_GUEST_IA32_FS_LIMIT,
VMCS_GUEST_IA32_FS_AR, VMCS_GUEST_IA32_FS_BASE },
{ VMCS_GUEST_IA32_GS_SEL, VMCS_GUEST_IA32_GS_LIMIT,
VMCS_GUEST_IA32_GS_AR, VMCS_GUEST_IA32_GS_BASE },
{ VMCS_GUEST_IA32_SS_SEL, VMCS_GUEST_IA32_SS_LIMIT,
VMCS_GUEST_IA32_SS_AR, VMCS_GUEST_IA32_SS_BASE },
{ VMCS_GUEST_IA32_LDTR_SEL, VMCS_GUEST_IA32_LDTR_LIMIT,
VMCS_GUEST_IA32_LDTR_AR, VMCS_GUEST_IA32_LDTR_BASE },
{ VMCS_GUEST_IA32_TR_SEL, VMCS_GUEST_IA32_TR_LIMIT,
VMCS_GUEST_IA32_TR_AR, VMCS_GUEST_IA32_TR_BASE }
};
/* Pools for VMs and VCPUs */
struct pool vm_pool;
struct pool vcpu_pool;
struct vmm_softc *vmm_softc;
/* IDT information used when populating host state area */
extern vaddr_t idt_vaddr;
extern struct gate_descriptor *idt;
/* Constants used in "CR access exit" */
#define CR_WRITE 0
#define CR_READ 1
#define CR_CLTS 2
#define CR_LMSW 3
/*
* vmm_enabled
*
* Checks if we have at least one CPU with either VMX or SVM.
* Returns 1 if we have at least one of either type, but not both, 0 otherwise.
*/
int
vmm_enabled(void)
{
struct cpu_info *ci;
CPU_INFO_ITERATOR cii;
int found_vmx = 0, found_svm = 0;
/* Check if we have at least one CPU with either VMX or SVM */
CPU_INFO_FOREACH(cii, ci) {
if (ci->ci_vmm_flags & CI_VMM_VMX)
found_vmx = 1;
if (ci->ci_vmm_flags & CI_VMM_SVM)
found_svm = 1;
}
/* Don't support both SVM and VMX at the same time */
if (found_vmx && found_svm)
return (0);
if (found_vmx || found_svm)
return 1;
return 0;
}
int
vmm_probe(struct device *parent, void *match, void *aux)
{
const char **busname = (const char **)aux;
if (strcmp(*busname, vmm_cd.cd_name) != 0)
return (0);
return (1);
}
/*
* vmm_attach
*
* Calculates how many of each type of CPU we have, prints this into dmesg
* during attach. Initializes various locks, pools, and list structures for the
* VMM.
*/
void
vmm_attach(struct device *parent, struct device *self, void *aux)
{
struct vmm_softc *sc = (struct vmm_softc *)self;
struct cpu_info *ci;
CPU_INFO_ITERATOR cii;
sc->nr_vmx_cpus = 0;
sc->nr_svm_cpus = 0;
sc->nr_rvi_cpus = 0;
sc->nr_ept_cpus = 0;
sc->vm_ct = 0;
sc->vm_idx = 0;
/* Calculate CPU features */
CPU_INFO_FOREACH(cii, ci) {
if (ci->ci_vmm_flags & CI_VMM_VMX)
sc->nr_vmx_cpus++;
if (ci->ci_vmm_flags & CI_VMM_SVM)
sc->nr_svm_cpus++;
if (ci->ci_vmm_flags & CI_VMM_RVI)
sc->nr_rvi_cpus++;
if (ci->ci_vmm_flags & CI_VMM_EPT)
sc->nr_ept_cpus++;
}
SLIST_INIT(&sc->vm_list);
rw_init(&sc->vm_lock, "vmlistlock");
if (sc->nr_ept_cpus) {
printf(": VMX/EPT");
sc->mode = VMM_MODE_EPT;
} else if (sc->nr_vmx_cpus) {
printf(": VMX");
sc->mode = VMM_MODE_VMX;
} else if (sc->nr_rvi_cpus) {
printf(": SVM/RVI");
sc->mode = VMM_MODE_RVI;
} else if (sc->nr_svm_cpus) {
printf(": SVM");
sc->mode = VMM_MODE_SVM;
} else {
printf(": unknown");
sc->mode = VMM_MODE_UNKNOWN;
}
if (sc->mode == VMM_MODE_EPT || sc->mode == VMM_MODE_VMX) {
if (!(curcpu()->ci_vmm_cap.vcc_vmx.vmx_has_l1_flush_msr)) {
l1tf_flush_region = km_alloc(VMX_L1D_FLUSH_SIZE,
&kv_any, &vmm_kp_contig, &kd_waitok);
if (!l1tf_flush_region) {
printf(" (failing, no memory)");
sc->mode = VMM_MODE_UNKNOWN;
} else {
printf(" (using slow L1TF mitigation)");
memset(l1tf_flush_region, 0xcc,
VMX_L1D_FLUSH_SIZE);
}
}
}
printf("\n");
if (sc->mode == VMM_MODE_SVM || sc->mode == VMM_MODE_RVI) {
sc->max_vpid = curcpu()->ci_vmm_cap.vcc_svm.svm_max_asid;
} else {
sc->max_vpid = 0xFFF;
}
bzero(&sc->vpids, sizeof(sc->vpids));
rw_init(&sc->vpid_lock, "vpidlock");
pool_init(&vm_pool, sizeof(struct vm), 0, IPL_NONE, PR_WAITOK,
"vmpool", NULL);
pool_init(&vcpu_pool, sizeof(struct vcpu), 64, IPL_NONE, PR_WAITOK,
"vcpupl", NULL);
vmm_softc = sc;
}
/*
* vmmopen
*
* Called during open of /dev/vmm. Presently unused.
*/
int
vmmopen(dev_t dev, int flag, int mode, struct proc *p)
{
/* Don't allow open if we didn't attach */
if (vmm_softc == NULL)
return (ENODEV);
/* Don't allow open if we didn't detect any supported CPUs */
if (vmm_softc->mode != VMM_MODE_EPT && vmm_softc->mode != VMM_MODE_RVI)
return (ENODEV);
return 0;
}
/*
* vmmioctl
*
* Main ioctl dispatch routine for /dev/vmm. Parses ioctl type and calls
* appropriate lower level handler routine. Returns result to ioctl caller.
*/
int
vmmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
{
int ret;
switch (cmd) {
case VMM_IOC_CREATE:
if ((ret = vmm_start()) != 0) {
vmm_stop();
break;
}
ret = vm_create((struct vm_create_params *)data, p);
break;
case VMM_IOC_RUN:
ret = vm_run((struct vm_run_params *)data);
break;
case VMM_IOC_INFO:
ret = vm_get_info((struct vm_info_params *)data);
break;
case VMM_IOC_TERM:
ret = vm_terminate((struct vm_terminate_params *)data);
break;
case VMM_IOC_RESETCPU:
ret = vm_resetcpu((struct vm_resetcpu_params *)data);
break;
case VMM_IOC_INTR:
ret = vm_intr_pending((struct vm_intr_params *)data);
break;
case VMM_IOC_READREGS:
ret = vm_rwregs((struct vm_rwregs_params *)data, 0);
break;
case VMM_IOC_WRITEREGS:
ret = vm_rwregs((struct vm_rwregs_params *)data, 1);
break;
case VMM_IOC_READVMPARAMS:
ret = vm_rwvmparams((struct vm_rwvmparams_params *)data, 0);
break;
case VMM_IOC_WRITEVMPARAMS:
ret = vm_rwvmparams((struct vm_rwvmparams_params *)data, 1);
break;
default:
DPRINTF("%s: unknown ioctl code 0x%lx\n", __func__, cmd);
ret = ENOTTY;
}
return (ret);
}
/*
* pledge_ioctl_vmm
*
* Restrict the allowed ioctls in a pledged process context.
* Is called from pledge_ioctl().
*/
int
pledge_ioctl_vmm(struct proc *p, long com)
{
switch (com) {
case VMM_IOC_CREATE:
case VMM_IOC_INFO:
/* The "parent" process in vmd forks and manages VMs */
if (p->p_p->ps_pledge & PLEDGE_PROC)
return (0);
break;
case VMM_IOC_TERM:
/* XXX VM processes should only terminate themselves */
case VMM_IOC_RUN:
case VMM_IOC_RESETCPU:
case VMM_IOC_INTR:
case VMM_IOC_READREGS:
case VMM_IOC_WRITEREGS:
case VMM_IOC_READVMPARAMS:
case VMM_IOC_WRITEVMPARAMS:
return (0);
}
return (EPERM);
}
/*
* vmmclose
*
* Called when /dev/vmm is closed. Presently unused.
*/
int
vmmclose(dev_t dev, int flag, int mode, struct proc *p)
{
return 0;
}
/*
* vm_resetcpu
*
* Resets the vcpu defined in 'vrp' to power-on-init register state
*
* Parameters:
* vrp: ioctl structure defining the vcpu to reset (see vmmvar.h)
*
* Returns 0 if successful, or various error codes on failure:
* ENOENT if the VM id contained in 'vrp' refers to an unknown VM or
* if vrp describes an unknown vcpu for this VM
* EBUSY if the indicated VCPU is not stopped
* EIO if the indicated VCPU failed to reset
*/
int
vm_resetcpu(struct vm_resetcpu_params *vrp)
{
struct vm *vm;
struct vcpu *vcpu;
int error;
/* Find the desired VM */
rw_enter_read(&vmm_softc->vm_lock);
error = vm_find(vrp->vrp_vm_id, &vm);
rw_exit_read(&vmm_softc->vm_lock);
/* Not found? exit. */
if (error != 0) {
DPRINTF("%s: vm id %u not found\n", __func__,
vrp->vrp_vm_id);
return (error);
}
rw_enter_read(&vm->vm_vcpu_lock);
SLIST_FOREACH(vcpu, &vm->vm_vcpu_list, vc_vcpu_link) {
if (vcpu->vc_id == vrp->vrp_vcpu_id)
break;
}
rw_exit_read(&vm->vm_vcpu_lock);
if (vcpu == NULL) {
DPRINTF("%s: vcpu id %u of vm %u not found\n", __func__,
vrp->vrp_vcpu_id, vrp->vrp_vm_id);
return (ENOENT);
}
if (vcpu->vc_state != VCPU_STATE_STOPPED) {
DPRINTF("%s: reset of vcpu %u on vm %u attempted "
"while vcpu was in state %u (%s)\n", __func__,
vrp->vrp_vcpu_id, vrp->vrp_vm_id, vcpu->vc_state,
vcpu_state_decode(vcpu->vc_state));
return (EBUSY);
}
DPRINTF("%s: resetting vm %d vcpu %d to power on defaults\n", __func__,
vm->vm_id, vcpu->vc_id);
if (vcpu_reset_regs(vcpu, &vrp->vrp_init_state)) {
printf("%s: failed\n", __func__);
#ifdef VMM_DEBUG
dump_vcpu(vcpu);
#endif /* VMM_DEBUG */
return (EIO);
}
return (0);
}
/*
* vm_intr_pending
*
* IOCTL handler routine for VMM_IOC_INTR messages, sent from vmd when an
* interrupt is pending and needs acknowledgment
*
* Parameters:
* vip: Describes the vm/vcpu for which the interrupt is pending
*
* Return values:
* 0: if successful
* ENOENT: if the VM/VCPU defined by 'vip' cannot be found
*/
int
vm_intr_pending(struct vm_intr_params *vip)
{
struct vm *vm;
struct vcpu *vcpu;
int error;
/* Find the desired VM */
rw_enter_read(&vmm_softc->vm_lock);
error = vm_find(vip->vip_vm_id, &vm);
/* Not found? exit. */
if (error != 0) {
rw_exit_read(&vmm_softc->vm_lock);
return (error);
}
rw_enter_read(&vm->vm_vcpu_lock);
SLIST_FOREACH(vcpu, &vm->vm_vcpu_list, vc_vcpu_link) {
if (vcpu->vc_id == vip->vip_vcpu_id)
break;
}
rw_exit_read(&vm->vm_vcpu_lock);
rw_exit_read(&vmm_softc->vm_lock);
if (vcpu == NULL)
return (ENOENT);
vcpu->vc_intr = vip->vip_intr;
#ifdef MULTIPROCESSOR
/*
* If the vcpu is running on another PCPU, attempt to force it
* to exit to process the pending interrupt. This could race as
* it could be running when we do the check but be stopped by the
* time we send the IPI. In this case, there is a small extra
* overhead to process the IPI but no other side effects.
*
* There is also a chance that the vcpu may have interrupts blocked.
* That's ok as that condition will be checked on exit, and we will
* simply re-enter the guest. This "fast notification" is done only
* as an optimization.
*/
if (vcpu->vc_state == VCPU_STATE_RUNNING &&
vip->vip_intr == 1)
x86_send_ipi(vcpu->vc_last_pcpu, X86_IPI_NOP);
#endif /* MULTIPROCESSOR */
return (0);
}
/*
* vm_rwvmparams
*
* IOCTL handler to read/write the current vmm params like pvclock gpa, pvclock
* version, etc.
*
* Parameters:
* vrwp: Describes the VM and VCPU to get/set the params from
* dir: 0 for reading, 1 for writing
*
* Return values:
* 0: if successful
* ENOENT: if the VM/VCPU defined by 'vpp' cannot be found
* EINVAL: if an error occured reading the registers of the guest
*/
int
vm_rwvmparams(struct vm_rwvmparams_params *vpp, int dir) {
struct vm *vm;
struct vcpu *vcpu;
int error;
/* Find the desired VM */
rw_enter_read(&vmm_softc->vm_lock);
error = vm_find(vpp->vpp_vm_id, &vm);
/* Not found? exit. */
if (error != 0) {
rw_exit_read(&vmm_softc->vm_lock);
return (error);
}
rw_enter_read(&vm->vm_vcpu_lock);
SLIST_FOREACH(vcpu, &vm->vm_vcpu_list, vc_vcpu_link) {
if (vcpu->vc_id == vpp->vpp_vcpu_id)
break;
}
rw_exit_read(&vm->vm_vcpu_lock);
rw_exit_read(&vmm_softc->vm_lock);
if (vcpu == NULL)
return (ENOENT);
if (dir == 0) {
if (vpp->vpp_mask & VM_RWVMPARAMS_PVCLOCK_VERSION)
vpp->vpp_pvclock_version = vcpu->vc_pvclock_version;
if (vpp->vpp_mask & VM_RWVMPARAMS_PVCLOCK_SYSTEM_GPA)
vpp->vpp_pvclock_system_gpa = \
vcpu->vc_pvclock_system_gpa;
return (0);
}
if (vpp->vpp_mask & VM_RWVMPARAMS_PVCLOCK_VERSION)
vcpu->vc_pvclock_version = vpp->vpp_pvclock_version;
if (vpp->vpp_mask & VM_RWVMPARAMS_PVCLOCK_SYSTEM_GPA) {
vmm_init_pvclock(vcpu, vpp->vpp_pvclock_system_gpa);
}
return (0);
}
/*
* vm_readregs
*
* IOCTL handler to read/write the current register values of a guest VCPU.
* The VCPU must not be running.
*
* Parameters:
* vrwp: Describes the VM and VCPU to get/set the registers from. The
* register values are returned here as well.
* dir: 0 for reading, 1 for writing
*
* Return values:
* 0: if successful
* ENOENT: if the VM/VCPU defined by 'vrwp' cannot be found
* EINVAL: if an error occured accessing the registers of the guest
* EPERM: if the vm cannot be accessed from the calling process
*/
int
vm_rwregs(struct vm_rwregs_params *vrwp, int dir)
{
struct vm *vm;
struct vcpu *vcpu;
struct vcpu_reg_state *vrs = &vrwp->vrwp_regs;
int error;
/* Find the desired VM */
rw_enter_read(&vmm_softc->vm_lock);
error = vm_find(vrwp->vrwp_vm_id, &vm);
/* Not found? exit. */
if (error != 0) {
rw_exit_read(&vmm_softc->vm_lock);
return (error);
}
rw_enter_read(&vm->vm_vcpu_lock);
SLIST_FOREACH(vcpu, &vm->vm_vcpu_list, vc_vcpu_link) {
if (vcpu->vc_id == vrwp->vrwp_vcpu_id)
break;
}
rw_exit_read(&vm->vm_vcpu_lock);
rw_exit_read(&vmm_softc->vm_lock);
if (vcpu == NULL)
return (ENOENT);
if (vmm_softc->mode == VMM_MODE_VMX ||
vmm_softc->mode == VMM_MODE_EPT)
return (dir == 0) ?
vcpu_readregs_vmx(vcpu, vrwp->vrwp_mask, vrs) :
vcpu_writeregs_vmx(vcpu, vrwp->vrwp_mask, 1, vrs);
else if (vmm_softc->mode == VMM_MODE_SVM ||
vmm_softc->mode == VMM_MODE_RVI)
return (dir == 0) ?
vcpu_readregs_svm(vcpu, vrwp->vrwp_mask, vrs) :
vcpu_writeregs_svm(vcpu, vrwp->vrwp_mask, vrs);
else {
DPRINTF("%s: unknown vmm mode", __func__);
return (EINVAL);
}
}
/*
* vm_find
*
* Function to find an existing VM by its identifier.
* Must be called under the global vm_lock.
*
* Parameters:
* id: The VM identifier.
* *res: A pointer to the VM or NULL if not found
*
* Return values:
* 0: if successful
* ENOENT: if the VM defined by 'id' cannot be found
* EPERM: if the VM cannot be accessed by the current process
*/
int
vm_find(uint32_t id, struct vm **res)
{
struct proc *p = curproc;
struct vm *vm;
*res = NULL;
SLIST_FOREACH(vm, &vmm_softc->vm_list, vm_link) {
if (vm->vm_id == id) {
/*
* In the pledged VM process, only allow to find
* the VM that is running in the current process.
* The managing vmm parent process can lookup all
* all VMs and is indicated by PLEDGE_PROC.
*/
if (((p->p_p->ps_pledge &
(PLEDGE_VMM|PLEDGE_PROC)) == PLEDGE_VMM) &&
(vm->vm_creator_pid != p->p_p->ps_pid))
return (pledge_fail(p, EPERM, PLEDGE_VMM));
*res = vm;
return (0);
}
}
return (ENOENT);
}
/*
* vmm_start
*
* Starts VMM mode on the system
*/
int
vmm_start(void)
{
struct cpu_info *self = curcpu();
int ret = 0;
#ifdef MULTIPROCESSOR
struct cpu_info *ci;
CPU_INFO_ITERATOR cii;
int i;
#endif
/* VMM is already running */
if (self->ci_flags & CPUF_VMM)
return (0);
#ifdef MULTIPROCESSOR
/* Broadcast start VMM IPI */
x86_broadcast_ipi(X86_IPI_START_VMM);
CPU_INFO_FOREACH(cii, ci) {
if (ci == self)
continue;
for (i = 100000; (!(ci->ci_flags & CPUF_VMM)) && i>0;i--)
delay(10);
if (!(ci->ci_flags & CPUF_VMM)) {
printf("%s: failed to enter VMM mode\n",
ci->ci_dev->dv_xname);
ret = EIO;
}
}
#endif /* MULTIPROCESSOR */
/* Start VMM on this CPU */
start_vmm_on_cpu(self);
if (!(self->ci_flags & CPUF_VMM)) {
printf("%s: failed to enter VMM mode\n",
self->ci_dev->dv_xname);
ret = EIO;
}
return (ret);
}
/*
* vmm_stop
*
* Stops VMM mode on the system
*/
int
vmm_stop(void)
{
struct cpu_info *self = curcpu();
int ret = 0;
#ifdef MULTIPROCESSOR
struct cpu_info *ci;
CPU_INFO_ITERATOR cii;
int i;
#endif
/* VMM is not running */
if (!(self->ci_flags & CPUF_VMM))
return (0);
#ifdef MULTIPROCESSOR
/* Stop VMM on other CPUs */
x86_broadcast_ipi(X86_IPI_STOP_VMM);
CPU_INFO_FOREACH(cii, ci) {
if (ci == self)
continue;
for (i = 100000; (ci->ci_flags & CPUF_VMM) && i>0 ;i--)
delay(10);
if (ci->ci_flags & CPUF_VMM) {
printf("%s: failed to exit VMM mode\n",
ci->ci_dev->dv_xname);
ret = EIO;
}
}
#endif /* MULTIPROCESSOR */
/* Stop VMM on this CPU */
stop_vmm_on_cpu(self);
if (self->ci_flags & CPUF_VMM) {
printf("%s: failed to exit VMM mode\n",
self->ci_dev->dv_xname);
ret = EIO;
}
return (ret);
}
/*
* start_vmm_on_cpu
*
* Starts VMM mode on 'ci' by executing the appropriate CPU-specific insn
* sequence to enter VMM mode (eg, VMXON)
*/
void
start_vmm_on_cpu(struct cpu_info *ci)
{
uint64_t msr;
uint32_t cr4;
/* No VMM mode? exit. */
if ((ci->ci_vmm_flags & CI_VMM_VMX) == 0 &&
(ci->ci_vmm_flags & CI_VMM_SVM) == 0)
return;
/*
* AMD SVM
*/
if (ci->ci_vmm_flags & CI_VMM_SVM) {
msr = rdmsr(MSR_EFER);
msr |= EFER_SVME;
wrmsr(MSR_EFER, msr);
}
/*
* Intel VMX
*/
if (ci->ci_vmm_flags & CI_VMM_VMX) {
if (ci->ci_vmxon_region == 0)
return;
else {
bzero(ci->ci_vmxon_region, PAGE_SIZE);
ci->ci_vmxon_region->vr_revision =
ci->ci_vmm_cap.vcc_vmx.vmx_vmxon_revision;
/* Set CR4.VMXE */
cr4 = rcr4();
cr4 |= CR4_VMXE;
lcr4(cr4);
/* Enable VMX */
msr = rdmsr(MSR_IA32_FEATURE_CONTROL);
if (msr & IA32_FEATURE_CONTROL_LOCK) {
if (!(msr & IA32_FEATURE_CONTROL_VMX_EN))
return;
} else {
msr |= IA32_FEATURE_CONTROL_VMX_EN |
IA32_FEATURE_CONTROL_LOCK;
wrmsr(MSR_IA32_FEATURE_CONTROL, msr);
}
/* Enter VMX mode */
if (vmxon((uint64_t *)&ci->ci_vmxon_region_pa))
return;
}
}
ci->ci_flags |= CPUF_VMM;
}