KVM: ia64: add directed mmio range support for kvm guests

Using vt-d, kvm guests can be assigned physcial devices, so
this patch introduce a new mmio type (directed mmio)
to handle its mmio access.

Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 17 insertions, 6 deletions

diff --git a/arch/ia64/kvm/vtlb.c b/arch/ia64/kvm/vtlb.c
index def4576d22b1..e22b93361e08 100644
--- a/arch/ia64/kvm/vtlb.c
+++ b/arch/ia64/kvm/vtlb.c
@@ -390,7 +390,7 @@ void thash_purge_entries_remote(struct kvm_vcpu *v, u64 va, u64 ps)
 
 u64 translate_phy_pte(u64 *pte, u64 itir, u64 va)
 {
-        u64 ps, ps_mask, paddr, maddr;
+        u64 ps, ps_mask, paddr, maddr, io_mask;
         union pte_flags phy_pte;
 
         ps = itir_ps(itir);
@@ -398,8 +398,9 @@ u64 translate_phy_pte(u64 *pte, u64 itir, u64 va)
         phy_pte.val = *pte;
         paddr = *pte;
         paddr = ((paddr & _PAGE_PPN_MASK) & ps_mask) | (va & ~ps_mask);
-        maddr = kvm_lookup_mpa(paddr >> PAGE_SHIFT);
-        if (maddr & GPFN_IO_MASK) {
+        maddr = kvm_get_mpt_entry(paddr >> PAGE_SHIFT);
+        io_mask = maddr & GPFN_IO_MASK;
+        if (io_mask && (io_mask != GPFN_PHYS_MMIO)) {
                 *pte |= VTLB_PTE_IO;
                 return -1;
         }
@@ -418,7 +419,7 @@ int thash_purge_and_insert(struct kvm_vcpu *v, u64 pte, u64 itir,
                                                 u64 ifa, int type)
 {
         u64 ps;
-        u64 phy_pte;
+        u64 phy_pte, io_mask, index;
         union ia64_rr vrr, mrr;
         int ret = 0;
 
@@ -426,13 +427,16 @@ int thash_purge_and_insert(struct kvm_vcpu *v, u64 pte, u64 itir,
         vrr.val = vcpu_get_rr(v, ifa);
         mrr.val = ia64_get_rr(ifa);
 
+        index = (pte & _PAGE_PPN_MASK) >> PAGE_SHIFT;
+        io_mask = kvm_get_mpt_entry(index) & GPFN_IO_MASK;
         phy_pte = translate_phy_pte(&pte, itir, ifa);
 
         /* Ensure WB attribute if pte is related to a normal mem page,
          * which is required by vga acceleration since qemu maps shared
          * vram buffer with WB.
          */
-        if (!(pte & VTLB_PTE_IO) && ((pte & _PAGE_MA_MASK) != _PAGE_MA_NAT)) {
+        if (!(pte & VTLB_PTE_IO) && ((pte & _PAGE_MA_MASK) != _PAGE_MA_NAT) &&
+                        io_mask != GPFN_PHYS_MMIO) {
                 pte &= ~_PAGE_MA_MASK;
                 phy_pte &= ~_PAGE_MA_MASK;
         }
@@ -566,12 +570,19 @@ void thash_init(struct thash_cb *hcb, u64 sz)
         }
 }
 
-u64 kvm_lookup_mpa(u64 gpfn)
+u64 kvm_get_mpt_entry(u64 gpfn)
 {
         u64 *base = (u64 *) KVM_P2M_BASE;
         return *(base + gpfn);
 }
 
+u64 kvm_lookup_mpa(u64 gpfn)
+{
+        u64 maddr;
+        maddr = kvm_get_mpt_entry(gpfn);
+        return maddr&_PAGE_PPN_MASK;
+}
+
 u64 kvm_gpa_to_mpa(u64 gpa)
 {
         u64 pte = kvm_lookup_mpa(gpa >> PAGE_SHIFT);