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qemu/target-i386/kvm.c
aliguori 55308450d4 Initialize msr list size properly in KVM 
Hollis Blanchard noticed that the last commit was not sufficient.  We also need
to initialize the msr size in our newly allocated list.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6018 c046a42c-6fe2-441c-8c8c-71466251a162
2008-12-13 20:49:31 +00:00

640 lines
17 KiB
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/*
* QEMU KVM support
*
* Copyright (C) 2006-2008 Qumranet Technologies
* Copyright IBM, Corp. 2008
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/kvm.h>
#include "qemu-common.h"
#include "sysemu.h"
#include "kvm.h"
#include "cpu.h"
//#define DEBUG_KVM
#ifdef DEBUG_KVM
#define dprintf(fmt, ...) \
do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintf(fmt, ...) \
do { } while (0)
#endif
int kvm_arch_init_vcpu(CPUState *env)
{
struct {
struct kvm_cpuid cpuid;
struct kvm_cpuid_entry entries[100];
} __attribute__((packed)) cpuid_data;
uint32_t limit, i, cpuid_i;
uint32_t eax, ebx, ecx, edx;
cpuid_i = 0;
cpu_x86_cpuid(env, 0, &eax, &ebx, &ecx, &edx);
limit = eax;
for (i = 0; i <= limit; i++) {
struct kvm_cpuid_entry *c = &cpuid_data.entries[cpuid_i++];
cpu_x86_cpuid(env, i, &eax, &ebx, &ecx, &edx);
c->function = i;
c->eax = eax;
c->ebx = ebx;
c->ecx = ecx;
c->edx = edx;
}
cpu_x86_cpuid(env, 0x80000000, &eax, &ebx, &ecx, &edx);
limit = eax;
for (i = 0x80000000; i <= limit; i++) {
struct kvm_cpuid_entry *c = &cpuid_data.entries[cpuid_i++];
cpu_x86_cpuid(env, i, &eax, &ebx, &ecx, &edx);
c->function = i;
c->eax = eax;
c->ebx = ebx;
c->ecx = ecx;
c->edx = edx;
}
cpuid_data.cpuid.nent = cpuid_i;
return kvm_vcpu_ioctl(env, KVM_SET_CPUID, &cpuid_data);
}
static int kvm_has_msr_star(CPUState *env)
{
static int has_msr_star;
int ret;
/* first time */
if (has_msr_star == 0) {
struct kvm_msr_list msr_list, *kvm_msr_list;
has_msr_star = -1;
/* Obtain MSR list from KVM. These are the MSRs that we must
* save/restore */
msr_list.nmsrs = 0;
ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, &msr_list);
if (ret < 0)
return 0;
kvm_msr_list = qemu_mallocz(sizeof(msr_list) +
msr_list.nmsrs * sizeof(msr_list.indices[0]));
if (kvm_msr_list == NULL)
return 0;
kvm_msr_list->nmsrs = msr_list.nmsrs;
ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, kvm_msr_list);
if (ret >= 0) {
int i;
for (i = 0; i < kvm_msr_list->nmsrs; i++) {
if (kvm_msr_list->indices[i] == MSR_STAR) {
has_msr_star = 1;
break;
}
}
}
free(kvm_msr_list);
}
if (has_msr_star == 1)
return 1;
return 0;
}
int kvm_arch_init(KVMState *s, int smp_cpus)
{
int ret;
/* create vm86 tss. KVM uses vm86 mode to emulate 16-bit code
* directly. In order to use vm86 mode, a TSS is needed. Since this
* must be part of guest physical memory, we need to allocate it. Older
* versions of KVM just assumed that it would be at the end of physical
* memory but that doesn't work with more than 4GB of memory. We simply
* refuse to work with those older versions of KVM. */
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SET_TSS_ADDR);
if (ret <= 0) {
fprintf(stderr, "kvm does not support KVM_CAP_SET_TSS_ADDR\n");
return ret;
}
/* this address is 3 pages before the bios, and the bios should present
* as unavaible memory. FIXME, need to ensure the e820 map deals with
* this?
*/
return kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, 0xfffbd000);
}
static void set_v8086_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
{
lhs->selector = rhs->selector;
lhs->base = rhs->base;
lhs->limit = rhs->limit;
lhs->type = 3;
lhs->present = 1;
lhs->dpl = 3;
lhs->db = 0;
lhs->s = 1;
lhs->l = 0;
lhs->g = 0;
lhs->avl = 0;
lhs->unusable = 0;
}
static void set_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
{
unsigned flags = rhs->flags;
lhs->selector = rhs->selector;
lhs->base = rhs->base;
lhs->limit = rhs->limit;
lhs->type = (flags >> DESC_TYPE_SHIFT) & 15;
lhs->present = (flags & DESC_P_MASK) != 0;
lhs->dpl = rhs->selector & 3;
lhs->db = (flags >> DESC_B_SHIFT) & 1;
lhs->s = (flags & DESC_S_MASK) != 0;
lhs->l = (flags >> DESC_L_SHIFT) & 1;
lhs->g = (flags & DESC_G_MASK) != 0;
lhs->avl = (flags & DESC_AVL_MASK) != 0;
lhs->unusable = 0;
}
static void get_seg(SegmentCache *lhs, const struct kvm_segment *rhs)
{
lhs->selector = rhs->selector;
lhs->base = rhs->base;
lhs->limit = rhs->limit;
lhs->flags =
(rhs->type << DESC_TYPE_SHIFT)
| (rhs->present * DESC_P_MASK)
| (rhs->dpl << DESC_DPL_SHIFT)
| (rhs->db << DESC_B_SHIFT)
| (rhs->s * DESC_S_MASK)
| (rhs->l << DESC_L_SHIFT)
| (rhs->g * DESC_G_MASK)
| (rhs->avl * DESC_AVL_MASK);
}
static void kvm_getput_reg(__u64 *kvm_reg, target_ulong *qemu_reg, int set)
{
if (set)
*kvm_reg = *qemu_reg;
else
*qemu_reg = *kvm_reg;
}
static int kvm_getput_regs(CPUState *env, int set)
{
struct kvm_regs regs;
int ret = 0;
if (!set) {
ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
if (ret < 0)
return ret;
}
kvm_getput_reg(&regs.rax, &env->regs[R_EAX], set);
kvm_getput_reg(&regs.rbx, &env->regs[R_EBX], set);
kvm_getput_reg(&regs.rcx, &env->regs[R_ECX], set);
kvm_getput_reg(&regs.rdx, &env->regs[R_EDX], set);
kvm_getput_reg(&regs.rsi, &env->regs[R_ESI], set);
kvm_getput_reg(&regs.rdi, &env->regs[R_EDI], set);
kvm_getput_reg(&regs.rsp, &env->regs[R_ESP], set);
kvm_getput_reg(&regs.rbp, &env->regs[R_EBP], set);
#ifdef TARGET_X86_64
kvm_getput_reg(&regs.r8, &env->regs[8], set);
kvm_getput_reg(&regs.r9, &env->regs[9], set);
kvm_getput_reg(&regs.r10, &env->regs[10], set);
kvm_getput_reg(&regs.r11, &env->regs[11], set);
kvm_getput_reg(&regs.r12, &env->regs[12], set);
kvm_getput_reg(&regs.r13, &env->regs[13], set);
kvm_getput_reg(&regs.r14, &env->regs[14], set);
kvm_getput_reg(&regs.r15, &env->regs[15], set);
#endif
kvm_getput_reg(&regs.rflags, &env->eflags, set);
kvm_getput_reg(&regs.rip, &env->eip, set);
if (set)
ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
return ret;
}
static int kvm_put_fpu(CPUState *env)
{
struct kvm_fpu fpu;
int i;
memset(&fpu, 0, sizeof fpu);
fpu.fsw = env->fpus & ~(7 << 11);
fpu.fsw |= (env->fpstt & 7) << 11;
fpu.fcw = env->fpuc;
for (i = 0; i < 8; ++i)
fpu.ftwx |= (!env->fptags[i]) << i;
memcpy(fpu.fpr, env->fpregs, sizeof env->fpregs);
memcpy(fpu.xmm, env->xmm_regs, sizeof env->xmm_regs);
fpu.mxcsr = env->mxcsr;
return kvm_vcpu_ioctl(env, KVM_SET_FPU, &fpu);
}
static int kvm_put_sregs(CPUState *env)
{
struct kvm_sregs sregs;
memcpy(sregs.interrupt_bitmap,
env->interrupt_bitmap,
sizeof(sregs.interrupt_bitmap));
if ((env->eflags & VM_MASK)) {
set_v8086_seg(&sregs.cs, &env->segs[R_CS]);
set_v8086_seg(&sregs.ds, &env->segs[R_DS]);
set_v8086_seg(&sregs.es, &env->segs[R_ES]);
set_v8086_seg(&sregs.fs, &env->segs[R_FS]);
set_v8086_seg(&sregs.gs, &env->segs[R_GS]);
set_v8086_seg(&sregs.ss, &env->segs[R_SS]);
} else {
set_seg(&sregs.cs, &env->segs[R_CS]);
set_seg(&sregs.ds, &env->segs[R_DS]);
set_seg(&sregs.es, &env->segs[R_ES]);
set_seg(&sregs.fs, &env->segs[R_FS]);
set_seg(&sregs.gs, &env->segs[R_GS]);
set_seg(&sregs.ss, &env->segs[R_SS]);
if (env->cr[0] & CR0_PE_MASK) {
/* force ss cpl to cs cpl */
sregs.ss.selector = (sregs.ss.selector & ~3) |
(sregs.cs.selector & 3);
sregs.ss.dpl = sregs.ss.selector & 3;
}
}
set_seg(&sregs.tr, &env->tr);
set_seg(&sregs.ldt, &env->ldt);
sregs.idt.limit = env->idt.limit;
sregs.idt.base = env->idt.base;
sregs.gdt.limit = env->gdt.limit;
sregs.gdt.base = env->gdt.base;
sregs.cr0 = env->cr[0];
sregs.cr2 = env->cr[2];
sregs.cr3 = env->cr[3];
sregs.cr4 = env->cr[4];
sregs.cr8 = cpu_get_apic_tpr(env);
sregs.apic_base = cpu_get_apic_base(env);
sregs.efer = env->efer;
return kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
}
static void kvm_msr_entry_set(struct kvm_msr_entry *entry,
uint32_t index, uint64_t value)
{
entry->index = index;
entry->data = value;
}
static int kvm_put_msrs(CPUState *env)
{
struct {
struct kvm_msrs info;
struct kvm_msr_entry entries[100];
} msr_data;
struct kvm_msr_entry *msrs = msr_data.entries;
int n = 0;
kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_CS, env->sysenter_cs);
kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_ESP, env->sysenter_esp);
kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_EIP, env->sysenter_eip);
if (kvm_has_msr_star(env))
kvm_msr_entry_set(&msrs[n++], MSR_STAR, env->star);
kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSC, env->tsc);
#ifdef TARGET_X86_64
/* FIXME if lm capable */
kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
kvm_msr_entry_set(&msrs[n++], MSR_KERNELGSBASE, env->kernelgsbase);
kvm_msr_entry_set(&msrs[n++], MSR_FMASK, env->fmask);
kvm_msr_entry_set(&msrs[n++], MSR_LSTAR, env->lstar);
#endif
msr_data.info.nmsrs = n;
return kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data);
}
static int kvm_get_fpu(CPUState *env)
{
struct kvm_fpu fpu;
int i, ret;
ret = kvm_vcpu_ioctl(env, KVM_GET_FPU, &fpu);
if (ret < 0)
return ret;
env->fpstt = (fpu.fsw >> 11) & 7;
env->fpus = fpu.fsw;
env->fpuc = fpu.fcw;
for (i = 0; i < 8; ++i)
env->fptags[i] = !((fpu.ftwx >> i) & 1);
memcpy(env->fpregs, fpu.fpr, sizeof env->fpregs);
memcpy(env->xmm_regs, fpu.xmm, sizeof env->xmm_regs);
env->mxcsr = fpu.mxcsr;
return 0;
}
static int kvm_get_sregs(CPUState *env)
{
struct kvm_sregs sregs;
uint32_t hflags;
int ret;
ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
if (ret < 0)
return ret;
memcpy(env->interrupt_bitmap,
sregs.interrupt_bitmap,
sizeof(sregs.interrupt_bitmap));
get_seg(&env->segs[R_CS], &sregs.cs);
get_seg(&env->segs[R_DS], &sregs.ds);
get_seg(&env->segs[R_ES], &sregs.es);
get_seg(&env->segs[R_FS], &sregs.fs);
get_seg(&env->segs[R_GS], &sregs.gs);
get_seg(&env->segs[R_SS], &sregs.ss);
get_seg(&env->tr, &sregs.tr);
get_seg(&env->ldt, &sregs.ldt);
env->idt.limit = sregs.idt.limit;
env->idt.base = sregs.idt.base;
env->gdt.limit = sregs.gdt.limit;
env->gdt.base = sregs.gdt.base;
env->cr[0] = sregs.cr0;
env->cr[2] = sregs.cr2;
env->cr[3] = sregs.cr3;
env->cr[4] = sregs.cr4;
cpu_set_apic_base(env, sregs.apic_base);
env->efer = sregs.efer;
//cpu_set_apic_tpr(env, sregs.cr8);
#define HFLAG_COPY_MASK ~( \
HF_CPL_MASK | HF_PE_MASK | HF_MP_MASK | HF_EM_MASK | \
HF_TS_MASK | HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK | \
HF_OSFXSR_MASK | HF_LMA_MASK | HF_CS32_MASK | \
HF_SS32_MASK | HF_CS64_MASK | HF_ADDSEG_MASK)
hflags = (env->segs[R_CS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK;
hflags |= (env->cr[0] & CR0_PE_MASK) << (HF_PE_SHIFT - CR0_PE_SHIFT);
hflags |= (env->cr[0] << (HF_MP_SHIFT - CR0_MP_SHIFT)) &
(HF_MP_MASK | HF_EM_MASK | HF_TS_MASK);
hflags |= (env->eflags & (HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK));
hflags |= (env->cr[4] & CR4_OSFXSR_MASK) <<
(HF_OSFXSR_SHIFT - CR4_OSFXSR_SHIFT);
if (env->efer & MSR_EFER_LMA) {
hflags |= HF_LMA_MASK;
}
if ((hflags & HF_LMA_MASK) && (env->segs[R_CS].flags & DESC_L_MASK)) {
hflags |= HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK;
} else {
hflags |= (env->segs[R_CS].flags & DESC_B_MASK) >>
(DESC_B_SHIFT - HF_CS32_SHIFT);
hflags |= (env->segs[R_SS].flags & DESC_B_MASK) >>
(DESC_B_SHIFT - HF_SS32_SHIFT);
if (!(env->cr[0] & CR0_PE_MASK) ||
(env->eflags & VM_MASK) ||
!(hflags & HF_CS32_MASK)) {
hflags |= HF_ADDSEG_MASK;
} else {
hflags |= ((env->segs[R_DS].base |
env->segs[R_ES].base |
env->segs[R_SS].base) != 0) <<
HF_ADDSEG_SHIFT;
}
}
env->hflags = (env->hflags & HFLAG_COPY_MASK) | hflags;
env->cc_src = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
env->df = 1 - (2 * ((env->eflags >> 10) & 1));
env->cc_op = CC_OP_EFLAGS;
env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
return 0;
}
static int kvm_get_msrs(CPUState *env)
{
struct {
struct kvm_msrs info;
struct kvm_msr_entry entries[100];
} msr_data;
struct kvm_msr_entry *msrs = msr_data.entries;
int ret, i, n;
n = 0;
msrs[n++].index = MSR_IA32_SYSENTER_CS;
msrs[n++].index = MSR_IA32_SYSENTER_ESP;
msrs[n++].index = MSR_IA32_SYSENTER_EIP;
if (kvm_has_msr_star(env))
msrs[n++].index = MSR_STAR;
msrs[n++].index = MSR_IA32_TSC;
#ifdef TARGET_X86_64
/* FIXME lm_capable_kernel */
msrs[n++].index = MSR_CSTAR;
msrs[n++].index = MSR_KERNELGSBASE;
msrs[n++].index = MSR_FMASK;
msrs[n++].index = MSR_LSTAR;
#endif
msr_data.info.nmsrs = n;
ret = kvm_vcpu_ioctl(env, KVM_GET_MSRS, &msr_data);
if (ret < 0)
return ret;
for (i = 0; i < ret; i++) {
switch (msrs[i].index) {
case MSR_IA32_SYSENTER_CS:
env->sysenter_cs = msrs[i].data;
break;
case MSR_IA32_SYSENTER_ESP:
env->sysenter_esp = msrs[i].data;
break;
case MSR_IA32_SYSENTER_EIP:
env->sysenter_eip = msrs[i].data;
break;
case MSR_STAR:
env->star = msrs[i].data;
break;
#ifdef TARGET_X86_64
case MSR_CSTAR:
env->cstar = msrs[i].data;
break;
case MSR_KERNELGSBASE:
env->kernelgsbase = msrs[i].data;
break;
case MSR_FMASK:
env->fmask = msrs[i].data;
break;
case MSR_LSTAR:
env->lstar = msrs[i].data;
break;
#endif
case MSR_IA32_TSC:
env->tsc = msrs[i].data;
break;
}
}
return 0;
}
int kvm_arch_put_registers(CPUState *env)
{
int ret;
ret = kvm_getput_regs(env, 1);
if (ret < 0)
return ret;
ret = kvm_put_fpu(env);
if (ret < 0)
return ret;
ret = kvm_put_sregs(env);
if (ret < 0)
return ret;
ret = kvm_put_msrs(env);
if (ret < 0)
return ret;
return 0;
}
int kvm_arch_get_registers(CPUState *env)
{
int ret;
ret = kvm_getput_regs(env, 0);
if (ret < 0)
return ret;
ret = kvm_get_fpu(env);
if (ret < 0)
return ret;
ret = kvm_get_sregs(env);
if (ret < 0)
return ret;
ret = kvm_get_msrs(env);
if (ret < 0)
return ret;
return 0;
}
int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
{
/* Try to inject an interrupt if the guest can accept it */
if (run->ready_for_interrupt_injection &&
(env->interrupt_request & CPU_INTERRUPT_HARD) &&
(env->eflags & IF_MASK)) {
int irq;
env->interrupt_request &= ~CPU_INTERRUPT_HARD;
irq = cpu_get_pic_interrupt(env);
if (irq >= 0) {
struct kvm_interrupt intr;
intr.irq = irq;
/* FIXME: errors */
dprintf("injected interrupt %d\n", irq);
kvm_vcpu_ioctl(env, KVM_INTERRUPT, &intr);
}
}
/* If we have an interrupt but the guest is not ready to receive an
* interrupt, request an interrupt window exit. This will
* cause a return to userspace as soon as the guest is ready to
* receive interrupts. */
if ((env->interrupt_request & CPU_INTERRUPT_HARD))
run->request_interrupt_window = 1;
else
run->request_interrupt_window = 0;
dprintf("setting tpr\n");
run->cr8 = cpu_get_apic_tpr(env);
return 0;
}
int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
{
if (run->if_flag)
env->eflags |= IF_MASK;
else
env->eflags &= ~IF_MASK;
cpu_set_apic_tpr(env, run->cr8);
cpu_set_apic_base(env, run->apic_base);
return 0;
}
static int kvm_handle_halt(CPUState *env)
{
if (!((env->interrupt_request & CPU_INTERRUPT_HARD) &&
(env->eflags & IF_MASK)) &&
!(env->interrupt_request & CPU_INTERRUPT_NMI)) {
env->halted = 1;
env->exception_index = EXCP_HLT;
return 0;
}
return 1;
}
int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
{
int ret = 0;
switch (run->exit_reason) {
case KVM_EXIT_HLT:
dprintf("handle_hlt\n");
ret = kvm_handle_halt(env);
break;
}
return ret;
}
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