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kvm: Setup VCPU MSRs

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Use the KVM_SET_MSRS ioctl() to set up model-specific registers (MSRs) to a
known state.  The MSRs are initialized to zero for now because I'm not sure
what are the right values.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Pekka Enberg
2015-06-01 16:39:39 +01:00
committed by Will Deacon
parent 3d78d3a59a
commit 53d4871448
2 changed files with 50 additions and 0 deletions
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include/kvm/kvm.h
+1
View File
@@ -26,6 +26,7 @@ struct kvm {
struct kvm_regs regs;
struct kvm_sregs sregs;
struct kvm_fpu fpu;
struct kvm_msrs *msrs; /* dynamically allocated */
struct interrupt_table interrupt_table;
};
kvm.c
+49
View File
@@ -378,6 +378,53 @@ static inline uint32_t selector_to_base(uint16_t selector)
return (uint32_t)selector * 16;
}
static struct kvm_msrs *kvm_msrs__new(size_t nmsrs)
{
struct kvm_msrs *self = calloc(1, sizeof(*self) + (sizeof(struct kvm_msr_entry) * nmsrs));
if (!self)
die("out of memory");
return self;
}
#define MSR_IA32_TIME_STAMP_COUNTER 0x10
#define MSR_IA32_SYSENTER_CS 0x174
#define MSR_IA32_SYSENTER_ESP 0x175
#define MSR_IA32_SYSENTER_EIP 0x176
#define MSR_IA32_STAR 0xc0000081
#define MSR_IA32_LSTAR 0xc0000082
#define MSR_IA32_CSTAR 0xc0000083
#define MSR_IA32_FMASK 0xc0000084
#define MSR_IA32_KERNEL_GS_BASE 0xc0000102
#define KVM_MSR_ENTRY(_index, _data) \
(struct kvm_msr_entry) { .index = _index, .data = _data }
static void kvm__setup_msrs(struct kvm *self)
{
unsigned long ndx = 0;
self->msrs = kvm_msrs__new(100);
self->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_SYSENTER_CS, 0x0);
self->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_SYSENTER_ESP, 0x0);
self->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_SYSENTER_EIP, 0x0);
self->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_STAR, 0x0);
self->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_CSTAR, 0x0);
self->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_KERNEL_GS_BASE, 0x0);
self->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_FMASK, 0x0);
self->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_LSTAR, 0x0);
self->msrs->entries[ndx++] = KVM_MSR_ENTRY(MSR_IA32_TIME_STAMP_COUNTER, 0x0);
self->msrs->nmsrs = ndx;
if (ioctl(self->vcpu_fd, KVM_SET_MSRS, self->msrs) < 0)
die_perror("KVM_SET_MSRS failed");
}
static void kvm__setup_fpu(struct kvm *self)
{
self->fpu = (struct kvm_fpu) {
@@ -494,6 +541,8 @@ void kvm__reset_vcpu(struct kvm *self)
kvm__setup_regs(self);
kvm__setup_fpu(self);
kvm__setup_msrs(self);
}
void kvm__run(struct kvm *self)