KVM: introduce readonly memslot

[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / x86 / kvm / mmu.c

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 5548971..8e312a2 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2647,6 +2647,15 @@ static void kvm_send_hwpoison_signal(unsigned long address, struct task_struct *
 
 static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gfn_t gfn, pfn_t pfn)
 {
+       /*
+        * Do not cache the mmio info caused by writing the readonly gfn
+        * into the spte otherwise read access on readonly gfn also can
+        * caused mmio page fault and treat it as mmio access.
+        * Return 1 to tell kvm to emulate it.
+        */
+       if (pfn == KVM_PFN_ERR_RO_FAULT)
+               return 1;
+
        if (pfn == KVM_PFN_ERR_HWPOISON) {
                kvm_send_hwpoison_signal(gfn_to_hva(vcpu->kvm, gfn), current);
                return 0;