svn commit: r249353 - projects/bhyve_svm/sys/amd64/vmm/amd
Neel Natu
neel at FreeBSD.org
Thu Apr 11 06:52:20 UTC 2013
Author: neel
Date: Thu Apr 11 06:52:19 2013
New Revision: 249353
URL: http://svnweb.freebsd.org/changeset/base/249353
Log:
Provide functions to manipulate the guest state in the VMCB.
Submitted by: Anish Gupta (akgupt3 at gmail.com)
Added:
projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c (contents, props changed)
Modified:
projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.h
Added: projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.c Thu Apr 11 06:52:19 2013 (r249353)
@@ -0,0 +1,383 @@
+/*-
+ * Copyright (c) 2013 Anish Gupta (akgupt3 at gmail.com)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/cpuset.h>
+
+#include <machine/segments.h>
+#include <machine/specialreg.h>
+#include <machine/vmm.h>
+
+#include "vmcb.h"
+
+/*
+ * Initialize SVM h/w context i.e. the VMCB control and saved state areas.
+ */
+int
+svm_init_vmcb(struct vmcb *vmcb, uint64_t iopm_base_pa,
+ uint64_t msrpm_base_pa, uint64_t np_pml4)
+{
+ struct vmcb_ctrl *ctrl;
+ struct vmcb_state *state;
+
+ ctrl = &vmcb->ctrl;
+ state = &vmcb->state;
+
+ ctrl->iopm_base_pa = iopm_base_pa;
+ ctrl->msrpm_base_pa = msrpm_base_pa;
+
+ /* Enable nested paging */
+ ctrl->np_enable = 1;
+ ctrl->n_cr3 = np_pml4;
+
+ /* EFER_SVM must always be set when the guest is executing */
+ state->efer = EFER_SVM;
+
+ return (0);
+}
+
+/*
+ * Set non-persistent fields of VMCB that are cleared by VMEXIT and must
+ * be set before restarting the guest (e.g. ASID, intercepts etc).
+ *
+ * APM2, Section 15.6, VMEXIT
+ */
+int
+svm_set_vmcb(struct vmcb *vmcb, uint8_t asid)
+{
+ struct vmcb_ctrl *ctrl;
+ struct vmcb_state *state;
+ uint16_t cr_shadow;
+
+ ctrl = &vmcb->ctrl;
+ state = &vmcb->state;
+
+ /*
+ * Intercept accesses to the control registers that are not shadowed
+ * in the VMCB - i.e. all except cr0, cr2, cr3, cr4 and cr8.
+ */
+ cr_shadow = BIT(0) | BIT(2) | BIT(3) | BIT(4) | BIT(8);
+ ctrl->cr_write = ctrl->cr_read = ~cr_shadow;
+
+ /* Intercept Machine Check exceptions. */
+ ctrl->exception = BIT(IDT_MC);
+
+ /* Intercept various events (for e.g. I/O, MSR and CPUID accesses) */
+ ctrl->ctrl1 = VMCB_INTCPT_IO |
+ VMCB_INTCPT_MSR |
+ VMCB_INTCPT_HLT |
+ VMCB_INTCPT_CPUID |
+ VMCB_INTCPT_INTR |
+ VMCB_INTCPT_VINTR |
+ VMCB_INTCPT_INIT |
+ VMCB_INTCPT_NMI |
+ VMCB_INTCPT_SMI |
+ VMCB_INTCPT_FERR_FREEZE |
+ VMCB_INTCPT_SHUTDOWN;
+
+ /* VMRUN intercept is required, see APM2 */
+ ctrl->ctrl2 = VMCB_INTCPT_VMRUN;
+
+ /* ASID is cleared after every #VMEXIT. */
+ ctrl->asid = asid;
+
+ /*
+ * Section 15.21.1, Interrupt Masking in EFLAGS
+ * Section 15.21.2, Virtualizing APIC.TPR
+ *
+ * This must be set for %rflag and %cr8 isolation of guest and host.
+ */
+ ctrl->v_intr_masking = 1;
+
+ /* Enable Last Branch Record aka LBR for debugging */
+ ctrl->lbr_virt_en = 1;
+ state->dbgctl = BIT(0);
+
+ return (0);
+}
+
+/*
+ * Read from segment selector, control and general purpose register of VMCB.
+ */
+int
+vmcb_read(struct vmcb *vmcb, int ident, uint64_t *retval)
+{
+ struct vmcb_state *state;
+ struct vmcb_segment *seg;
+ int err;
+
+ state = &vmcb->state;
+ err = 0;
+
+ switch (ident) {
+ case VM_REG_GUEST_CR0:
+ *retval = state->cr0;
+ break;
+
+ case VM_REG_GUEST_CR3:
+ *retval = state->cr3;
+ break;
+
+ case VM_REG_GUEST_CR4:
+ *retval = state->cr4;
+ break;
+
+ case VM_REG_GUEST_DR7:
+ *retval = state->dr7;
+ break;
+
+ case VM_REG_GUEST_EFER:
+ *retval = state->efer;
+ break;
+
+ case VM_REG_GUEST_RAX:
+ *retval = state->rax;
+ break;
+
+ case VM_REG_GUEST_RFLAGS:
+ *retval = state->rflags;
+ break;
+
+ case VM_REG_GUEST_RIP:
+ *retval = state->rip;
+ break;
+
+ case VM_REG_GUEST_RSP:
+ *retval = state->rsp;
+ break;
+
+ case VM_REG_GUEST_CS:
+ case VM_REG_GUEST_DS:
+ case VM_REG_GUEST_ES:
+ case VM_REG_GUEST_FS:
+ case VM_REG_GUEST_GS:
+ case VM_REG_GUEST_SS:
+ case VM_REG_GUEST_GDTR:
+ case VM_REG_GUEST_IDTR:
+ case VM_REG_GUEST_LDTR:
+ case VM_REG_GUEST_TR:
+ seg = vmcb_seg(vmcb, ident);
+ if (seg == NULL) {
+ ERR("Invalid seg type %d\n", ident);
+ err = EINVAL;
+ break;
+ }
+
+ *retval = seg->selector;
+ break;
+
+ default:
+ err = EINVAL;
+ break;
+ }
+
+ return (err);
+}
+
+/*
+ * Write to segment selector, control and general purpose register of VMCB.
+ */
+int
+vmcb_write(struct vmcb *vmcb, int ident, uint64_t val)
+{
+ struct vmcb_state *state;
+ struct vmcb_segment *seg;
+ int err;
+
+ state = &vmcb->state;
+ err = 0;
+
+ switch (ident) {
+ case VM_REG_GUEST_CR0:
+ state->cr0 = val;
+ break;
+
+ case VM_REG_GUEST_CR3:
+ state->cr3 = val;
+ break;
+
+ case VM_REG_GUEST_CR4:
+ state->cr4 = val;
+ break;
+
+ case VM_REG_GUEST_DR7:
+ state->dr7 = val;
+ break;
+
+ case VM_REG_GUEST_EFER:
+ /* EFER_SVM must always be set when the guest is executing */
+ state->efer = val | EFER_SVM;
+ break;
+
+ case VM_REG_GUEST_RAX:
+ state->rax = val;
+ break;
+
+ case VM_REG_GUEST_RFLAGS:
+ state->rflags = val;
+ break;
+
+ case VM_REG_GUEST_RIP:
+ state->rip = val;
+ break;
+
+ case VM_REG_GUEST_RSP:
+ state->rsp = val;
+ break;
+
+ case VM_REG_GUEST_CS:
+ case VM_REG_GUEST_DS:
+ case VM_REG_GUEST_ES:
+ case VM_REG_GUEST_FS:
+ case VM_REG_GUEST_GS:
+ case VM_REG_GUEST_SS:
+ case VM_REG_GUEST_GDTR:
+ case VM_REG_GUEST_IDTR:
+ case VM_REG_GUEST_LDTR:
+ case VM_REG_GUEST_TR:
+ seg = vmcb_seg(vmcb, ident);
+ if (seg == NULL) {
+ ERR("Invalid segment type %d\n", ident);
+ err = EINVAL;
+ break;
+ }
+
+ seg->selector = val;
+ break;
+
+ default:
+ err = EINVAL;
+ }
+
+ return (err);
+}
+
+/*
+ * Return VMCB segment area.
+ */
+struct vmcb_segment *
+vmcb_seg(struct vmcb *vmcb, int type)
+{
+ struct vmcb_state *state;
+ struct vmcb_segment *seg;
+
+ state = &vmcb->state;
+
+ switch (type) {
+ case VM_REG_GUEST_CS:
+ seg = &state->cs;
+ break;
+
+ case VM_REG_GUEST_DS:
+ seg = &state->ds;
+ break;
+
+ case VM_REG_GUEST_ES:
+ seg = &state->es;
+ break;
+
+ case VM_REG_GUEST_FS:
+ seg = &state->fs;
+ break;
+
+ case VM_REG_GUEST_GS:
+ seg = &state->gs;
+ break;
+
+ case VM_REG_GUEST_SS:
+ seg = &state->ss;
+ break;
+
+ case VM_REG_GUEST_GDTR:
+ seg = &state->gdt;
+ break;
+
+ case VM_REG_GUEST_IDTR:
+ seg = &state->idt;
+ break;
+
+ case VM_REG_GUEST_LDTR:
+ seg = &state->ldt;
+ break;
+
+ case VM_REG_GUEST_TR:
+ seg = &state->tr;
+ break;
+
+ default:
+ seg = NULL;
+ break;
+ }
+
+ return (seg);
+}
+
+/*
+ * Inject an event to vcpu as described in section 15.20, "Event injection".
+ */
+int
+vmcb_eventinject(struct vmcb_ctrl *ctrl, int type, int vector,
+ uint32_t error, boolean_t ec_valid)
+{
+ int intr_type;
+
+ static uint8_t svm_intr_type_map[VM_EVENT_MAX] = {
+ -1, /* VM_EVENT_NONE */
+ VMCB_EVENTINJ_TYPE_INTR, /* VM_HW_INTR */
+ VMCB_EVENTINJ_TYPE_NMI, /* VM_NMI */
+ VMCB_EVENTINJ_TYPE_EXCEPTION, /* VM_HW_EXCEPTION */
+ VMCB_EVENTINJ_TYPE_INTn, /* VM_SW_INTR, INT */
+ VMCB_EVENTINJ_TYPE_INTn, /* VM_PRIV_SW_EXCEPTION */
+ VMCB_EVENTINJ_TYPE_INTn, /* VM_SW_EXCEPTION */
+ };
+
+ intr_type = svm_intr_type_map[type];
+ if (intr_type < VMCB_EVENTINJ_TYPE_INTR ||
+ intr_type > VMCB_EVENTINJ_TYPE_INTn) {
+ ERR("Event:%d is not supported by SVM.\n", type);
+ return (EINVAL);
+ }
+
+ if (intr_type == VMCB_EVENTINJ_TYPE_EXCEPTION && vector == IDT_NMI) {
+ ERR("NMI with Exception type is not possible.\n");
+ return (EINVAL);
+ }
+
+ ctrl->eventinj = (vector & VMCB_EVENTINJ_VECTOR_MASK) |
+ (intr_type << VMCB_EVENTINJ_INTR_TYPE_SHIFT) |
+ (ec_valid ? VMCB_EVENTINJ_EC_VALID : 0) |
+ VMCB_EVENTINJ_VALID;
+
+ ctrl->eventinj |= (uint64_t)error << VMCB_EVENTINJ_ERRCODE_SHIFT;
+
+ return (0);
+}
Modified: projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.h
==============================================================================
--- projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.h Thu Apr 11 06:34:41 2013 (r249352)
+++ projects/bhyve_svm/sys/amd64/vmm/amd/vmcb.h Thu Apr 11 06:52:19 2013 (r249353)
@@ -29,6 +29,14 @@
#ifndef _VMCB_H_
#define _VMCB_H_
+#ifndef BIT
+#define BIT(bitpos) (1UL << (bitpos))
+#endif
+
+#ifndef ERR
+#define ERR(...)
+#endif
+
/*
* Secure Virtual Machine: AMD64 Programmer's Manual Vol2, Chapter 15
* Layout of VMCB: AMD64 Programmer's Manual Vol2, Appendix B
@@ -267,4 +275,13 @@ struct vmcb {
CTASSERT(sizeof(struct vmcb) == PAGE_SIZE);
CTASSERT(offsetof(struct vmcb, state) == 0x400);
+int svm_init_vmcb(struct vmcb *vmcb, uint64_t iopm_base_pa,
+ uint64_t msrpm_base_pa, uint64_t np_pml4);
+int svm_set_vmcb(struct vmcb *vmcb, uint8_t asid);
+int vmcb_read(struct vmcb *vmcb, int ident, uint64_t *retval);
+int vmcb_write(struct vmcb *vmcb, int ident, uint64_t val);
+struct vmcb_segment *vmcb_seg(struct vmcb *vmcb, int type);
+int vmcb_eventinject(struct vmcb_ctrl *ctrl, int type, int vector,
+ uint32_t error, boolean_t ec_valid);
+
#endif /* _VMCB_H_ */
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