8b28761278
- Don't always pass the cpuid request to the current CPU as some nodes we will emulate purely in software. - Pass in the APIC ID of the virtual CPU so we can return the proper APIC ID. - Always report a completely flat topology with no SMT or multicore. - Report the CPUID2_HV feature and implement support for the 0x40000000 CPUID level. - Use existing constants from <machine/specialreg.h> when possible and use cpu_feature2 when checking for VMX support.
173 lines
4.1 KiB
C
173 lines
4.1 KiB
C
/*-
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* Copyright (c) 2011 NetApp, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <machine/cpufunc.h>
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#include <machine/md_var.h>
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#include <machine/specialreg.h>
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#include "x86.h"
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#define CPUID_VM_HIGH 0x40000000
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static const char bhyve_id[12] = "BHyVE BHyVE ";
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int
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x86_emulate_cpuid(uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx,
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uint32_t vcpu_id)
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{
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unsigned int func, regs[4];
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func = *eax;
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/*
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* Requests for invalid CPUID levels should map to the highest
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* available level instead.
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*/
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if (cpu_exthigh != 0 && *eax >= 0x80000000) {
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if (*eax > cpu_exthigh)
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*eax = cpu_exthigh;
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} else if (*eax >= 0x40000000) {
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if (*eax > CPUID_VM_HIGH)
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*eax = CPUID_VM_HIGH;
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} else if (*eax > cpu_high) {
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*eax = cpu_high;
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}
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/*
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* In general the approach used for CPU topology is to
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* advertise a flat topology where all CPUs are packages with
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* no multi-core or SMT.
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*/
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switch (func) {
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case CPUID_0000_0000:
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case CPUID_0000_0002:
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case CPUID_0000_0003:
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case CPUID_0000_000A:
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cpuid_count(*eax, *ecx, regs);
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break;
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case CPUID_8000_0000:
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case CPUID_8000_0001:
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case CPUID_8000_0002:
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case CPUID_8000_0003:
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case CPUID_8000_0004:
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case CPUID_8000_0006:
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case CPUID_8000_0007:
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case CPUID_8000_0008:
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cpuid_count(*eax, *ecx, regs);
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break;
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case CPUID_0000_0001:
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do_cpuid(1, regs);
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/*
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* Override the APIC ID only in ebx
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*/
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regs[1] &= ~(CPUID_LOCAL_APIC_ID);
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regs[1] |= (vcpu_id << CPUID_0000_0001_APICID_SHIFT);
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/*
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* Don't expose VMX, SpeedStep or TME capability.
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* Advertise x2APIC capability and Hypervisor guest.
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*/
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regs[2] &= ~(CPUID2_VMX | CPUID2_EST | CPUID2_TM2);
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regs[2] |= CPUID2_X2APIC | CPUID2_HV;
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/*
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* Hide thermal monitoring
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*/
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regs[3] &= ~(CPUID_ACPI | CPUID_TM);
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/*
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* Machine check handling is done in the host.
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* Hide MTRR capability.
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*/
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regs[3] &= ~(CPUID_MCA | CPUID_MCE | CPUID_MTRR);
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/*
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* Disable multi-core.
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*/
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regs[1] &= ~CPUID_HTT_CORES;
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regs[3] &= ~CPUID_HTT;
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break;
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case CPUID_0000_0004:
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do_cpuid(4, regs);
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/*
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* Do not expose topology.
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*/
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regs[0] &= 0xffff8000;
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regs[0] |= 0x04008000;
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break;
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case CPUID_0000_0006:
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/*
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* Handle the access, but report 0 for
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* all options
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*/
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regs[0] = 0;
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regs[1] = 0;
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regs[2] = 0;
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regs[3] = 0;
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break;
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case CPUID_0000_000B:
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/*
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* Processor topology enumeration
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*/
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regs[0] = 0;
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regs[1] = 0;
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regs[2] = *ecx & 0xff;
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regs[3] = vcpu_id;
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break;
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case 0x40000000:
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regs[0] = CPUID_VM_HIGH;
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bcopy(bhyve_id, ®s[1], 4);
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bcopy(bhyve_id, ®s[2], 4);
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bcopy(bhyve_id, ®s[3], 4);
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break;
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default:
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/* XXX: Leaf 5? */
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return (0);
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}
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*eax = regs[0];
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*ebx = regs[1];
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*ecx = regs[2];
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*edx = regs[3];
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return (1);
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}
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