KVM: VMX: Move private memory slot position

PCI device assignment would map guest MMIO spaces as separate slot, so it is
possible that the device has more than 2 MMIO spaces and overwrite current
private memslot.

The patch move private memory slot to the top of userspace visible memory slots.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

2 files changed, 4 insertions, 3 deletions

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index dae134fa09e7..7623eb7b68d5 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2513,7 +2513,7 @@ static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
 {
         int ret;
         struct kvm_userspace_memory_region tss_mem = {
-                .slot = 8,
+                .slot = TSS_PRIVATE_MEMSLOT,
                 .guest_phys_addr = addr,
                 .memory_size = PAGE_SIZE * 3,
                 .flags = 0,
diff --git a/arch/x86/kvm/vmx.h b/arch/x86/kvm/vmx.h
index 18598afe52eb..3db236c26fa4 100644
--- a/arch/x86/kvm/vmx.h
+++ b/arch/x86/kvm/vmx.h
@@ -338,8 +338,9 @@ enum vmcs_field {
 
 #define AR_RESERVD_MASK 0xfffe0f00
 
-#define APIC_ACCESS_PAGE_PRIVATE_MEMSLOT        9
-#define IDENTITY_PAGETABLE_PRIVATE_MEMSLOT      10
+#define TSS_PRIVATE_MEMSLOT                     (KVM_MEMORY_SLOTS + 0)
+#define APIC_ACCESS_PAGE_PRIVATE_MEMSLOT        (KVM_MEMORY_SLOTS + 1)
+#define IDENTITY_PAGETABLE_PRIVATE_MEMSLOT      (KVM_MEMORY_SLOTS + 2)
 
 #define VMX_NR_VPIDS                            (1 << 16)
 #define VMX_VPID_EXTENT_SINGLE_CONTEXT          1