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-rw-r--r--drivers/kvm/kvm.h5
-rw-r--r--drivers/kvm/kvm_main.c69
-rw-r--r--drivers/kvm/svm.c4
-rw-r--r--drivers/kvm/vmx.c4
-rw-r--r--include/linux/kvm.h18
5 files changed, 95 insertions, 5 deletions
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 59cbc5b1d90..be3a0e7ecae 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -55,6 +55,7 @@
#define KVM_NUM_MMU_PAGES 256
#define KVM_MIN_FREE_MMU_PAGES 5
#define KVM_REFILL_PAGES 25
+#define KVM_MAX_CPUID_ENTRIES 40
#define FX_IMAGE_SIZE 512
#define FX_IMAGE_ALIGN 16
@@ -286,6 +287,9 @@ struct kvm_vcpu {
u32 ar;
} tr, es, ds, fs, gs;
} rmode;
+
+ int cpuid_nent;
+ struct kvm_cpuid_entry cpuid_entries[KVM_MAX_CPUID_ENTRIES];
};
struct kvm_memory_slot {
@@ -446,6 +450,7 @@ void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long value,
struct x86_emulate_ctxt;
+void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address);
int emulate_clts(struct kvm_vcpu *vcpu);
int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr,
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index ff8bcfee76e..caec54fbf07 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1504,6 +1504,43 @@ void save_msrs(struct vmx_msr_entry *e, int n)
}
EXPORT_SYMBOL_GPL(save_msrs);
+void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
+{
+ int i;
+ u32 function;
+ struct kvm_cpuid_entry *e, *best;
+
+ kvm_arch_ops->cache_regs(vcpu);
+ function = vcpu->regs[VCPU_REGS_RAX];
+ vcpu->regs[VCPU_REGS_RAX] = 0;
+ vcpu->regs[VCPU_REGS_RBX] = 0;
+ vcpu->regs[VCPU_REGS_RCX] = 0;
+ vcpu->regs[VCPU_REGS_RDX] = 0;
+ best = NULL;
+ for (i = 0; i < vcpu->cpuid_nent; ++i) {
+ e = &vcpu->cpuid_entries[i];
+ if (e->function == function) {
+ best = e;
+ break;
+ }
+ /*
+ * Both basic or both extended?
+ */
+ if (((e->function ^ function) & 0x80000000) == 0)
+ if (!best || e->function > best->function)
+ best = e;
+ }
+ if (best) {
+ vcpu->regs[VCPU_REGS_RAX] = best->eax;
+ vcpu->regs[VCPU_REGS_RBX] = best->ebx;
+ vcpu->regs[VCPU_REGS_RCX] = best->ecx;
+ vcpu->regs[VCPU_REGS_RDX] = best->edx;
+ }
+ kvm_arch_ops->decache_regs(vcpu);
+ kvm_arch_ops->skip_emulated_instruction(vcpu);
+}
+EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
+
static void complete_pio(struct kvm_vcpu *vcpu)
{
struct kvm_io *io = &vcpu->run->io;
@@ -2075,6 +2112,26 @@ out:
return r;
}
+static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
+ struct kvm_cpuid *cpuid,
+ struct kvm_cpuid_entry __user *entries)
+{
+ int r;
+
+ r = -E2BIG;
+ if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
+ goto out;
+ r = -EFAULT;
+ if (copy_from_user(&vcpu->cpuid_entries, entries,
+ cpuid->nent * sizeof(struct kvm_cpuid_entry)))
+ goto out;
+ vcpu->cpuid_nent = cpuid->nent;
+ return 0;
+
+out:
+ return r;
+}
+
static long kvm_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@@ -2181,6 +2238,18 @@ static long kvm_vcpu_ioctl(struct file *filp,
case KVM_SET_MSRS:
r = msr_io(vcpu, argp, do_set_msr, 0);
break;
+ case KVM_SET_CPUID: {
+ struct kvm_cpuid __user *cpuid_arg = argp;
+ struct kvm_cpuid cpuid;
+
+ r = -EFAULT;
+ if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
+ goto out;
+ r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
+ if (r)
+ goto out;
+ break;
+ }
default:
;
}
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index c35b8c83bf3..d4b2936479d 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -1101,8 +1101,8 @@ static int task_switch_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_r
static int cpuid_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
vcpu->svm->next_rip = vcpu->svm->vmcb->save.rip + 2;
- kvm_run->exit_reason = KVM_EXIT_CPUID;
- return 0;
+ kvm_emulate_cpuid(vcpu);
+ return 1;
}
static int emulate_on_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 4d5f40fcb65..71410a65bb9 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -1585,8 +1585,8 @@ static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
- kvm_run->exit_reason = KVM_EXIT_CPUID;
- return 0;
+ kvm_emulate_cpuid(vcpu);
+ return 1;
}
static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 19aeb338518..15e23bc06e8 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -41,7 +41,6 @@ enum kvm_exit_reason {
KVM_EXIT_UNKNOWN = 0,
KVM_EXIT_EXCEPTION = 1,
KVM_EXIT_IO = 2,
- KVM_EXIT_CPUID = 3,
KVM_EXIT_DEBUG = 4,
KVM_EXIT_HLT = 5,
KVM_EXIT_MMIO = 6,
@@ -210,6 +209,22 @@ struct kvm_dirty_log {
};
};
+struct kvm_cpuid_entry {
+ __u32 function;
+ __u32 eax;
+ __u32 ebx;
+ __u32 ecx;
+ __u32 edx;
+ __u32 padding;
+};
+
+/* for KVM_SET_CPUID */
+struct kvm_cpuid {
+ __u32 nent;
+ __u32 padding;
+ struct kvm_cpuid_entry entries[0];
+};
+
#define KVMIO 0xAE
/*
@@ -243,5 +258,6 @@ struct kvm_dirty_log {
#define KVM_DEBUG_GUEST _IOW(KVMIO, 9, struct kvm_debug_guest)
#define KVM_GET_MSRS _IOWR(KVMIO, 13, struct kvm_msrs)
#define KVM_SET_MSRS _IOW(KVMIO, 14, struct kvm_msrs)
+#define KVM_SET_CPUID _IOW(KVMIO, 17, struct kvm_cpuid)
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-23 13:40:26 +0000