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-rw-r--r--drivers/kvm/kvm.h3
-rw-r--r--drivers/kvm/kvm_main.c16
-rw-r--r--drivers/kvm/svm.c7
-rw-r--r--drivers/kvm/vmx.c27
-rw-r--r--include/linux/kvm.h2
5 files changed, 53 insertions, 2 deletions
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 82c3b13..3d07d9b 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -382,6 +382,7 @@ struct kvm {
struct kvm_pic *vpic;
struct kvm_ioapic *vioapic;
int round_robin_prev_vcpu;
+ unsigned int tss_addr;
};
static inline struct kvm_pic *pic_irqchip(struct kvm *kvm)
@@ -467,6 +468,8 @@ struct kvm_x86_ops {
void (*inject_pending_irq)(struct kvm_vcpu *vcpu);
void (*inject_pending_vectors)(struct kvm_vcpu *vcpu,
struct kvm_run *run);
+
+ int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
};
extern struct kvm_x86_ops *kvm_x86_ops;
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index a044856..50fd040 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -2661,6 +2661,16 @@ static int create_vcpu_fd(struct kvm_vcpu *vcpu)
return fd;
}
+static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
+{
+ int ret;
+
+ if (addr > (unsigned int)(-3 * PAGE_SIZE))
+ return -1;
+ ret = kvm_x86_ops->set_tss_addr(kvm, addr);
+ return ret;
+}
+
/*
* Creates some virtual cpus. Good luck creating more than one.
*/
@@ -2957,6 +2967,11 @@ static long kvm_vm_ioctl(struct file *filp,
int r = -EINVAL;
switch (ioctl) {
+ case KVM_SET_TSS_ADDR:
+ r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
+ if (r < 0)
+ goto out;
+ break;
case KVM_CREATE_VCPU:
r = kvm_vm_ioctl_create_vcpu(kvm, arg);
if (r < 0)
@@ -3183,6 +3198,7 @@ static long kvm_dev_ioctl(struct file *filp,
case KVM_CAP_HLT:
case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
case KVM_CAP_USER_MEMORY:
+ case KVM_CAP_SET_TSS_ADDR:
r = 1;
break;
default:
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c
index 953c111..beb1e68 100644
--- a/drivers/kvm/svm.c
+++ b/drivers/kvm/svm.c
@@ -1439,6 +1439,11 @@ static void do_interrupt_requests(struct kvm_vcpu *vcpu,
control->intercept &= ~(1ULL << INTERCEPT_VINTR);
}
+static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
+{
+ return 0;
+}
+
static void save_db_regs(unsigned long *db_regs)
{
asm volatile ("mov %%dr0, %0" : "=r"(db_regs[0]));
@@ -1744,6 +1749,8 @@ static struct kvm_x86_ops svm_x86_ops = {
.set_irq = svm_set_irq,
.inject_pending_irq = svm_intr_assist,
.inject_pending_vectors = do_interrupt_requests,
+
+ .set_tss_addr = svm_set_tss_addr,
};
static int __init svm_init(void)
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 768ea88..46b2918 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -1105,8 +1105,12 @@ static void enter_pmode(struct kvm_vcpu *vcpu)
static gva_t rmode_tss_base(struct kvm *kvm)
{
- gfn_t base_gfn = kvm->memslots[0].base_gfn + kvm->memslots[0].npages - 3;
- return base_gfn << PAGE_SHIFT;
+ if (!kvm->tss_addr) {
+ gfn_t base_gfn = kvm->memslots[0].base_gfn +
+ kvm->memslots[0].npages - 3;
+ return base_gfn << PAGE_SHIFT;
+ }
+ return kvm->tss_addr;
}
static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
@@ -1735,6 +1739,23 @@ static void do_interrupt_requests(struct kvm_vcpu *vcpu,
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
}
+static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
+{
+ int ret;
+ struct kvm_userspace_memory_region tss_mem = {
+ .slot = 8,
+ .guest_phys_addr = addr,
+ .memory_size = PAGE_SIZE * 3,
+ .flags = 0,
+ };
+
+ ret = kvm_set_memory_region(kvm, &tss_mem, 0);
+ if (ret)
+ return ret;
+ kvm->tss_addr = addr;
+ return 0;
+}
+
static void kvm_guest_debug_pre(struct kvm_vcpu *vcpu)
{
struct kvm_guest_debug *dbg = &vcpu->guest_debug;
@@ -2543,6 +2564,8 @@ static struct kvm_x86_ops vmx_x86_ops = {
.set_irq = vmx_inject_irq,
.inject_pending_irq = vmx_intr_assist,
.inject_pending_vectors = do_interrupt_requests,
+
+ .set_tss_addr = vmx_set_tss_addr,
};
static int __init vmx_init(void)
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 971f465..71d33d6 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -358,6 +358,7 @@ struct kvm_signal_mask {
#define KVM_CAP_HLT 1
#define KVM_CAP_MMU_SHADOW_CACHE_CONTROL 2
#define KVM_CAP_USER_MEMORY 3
+#define KVM_CAP_SET_TSS_ADDR 4
/*
* ioctls for VM fds
@@ -367,6 +368,7 @@ struct kvm_signal_mask {
#define KVM_GET_NR_MMU_PAGES _IO(KVMIO, 0x45)
#define KVM_SET_USER_MEMORY_REGION _IOW(KVMIO, 0x46,\
struct kvm_userspace_memory_region)
+#define KVM_SET_TSS_ADDR _IO(KVMIO, 0x47)
/*
* KVM_CREATE_VCPU receives as a parameter the vcpu slot, and returns
* a vcpu fd.