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authorPaolo Bonzini <pbonzini@redhat.com>2019-06-30 08:36:21 -0400
committerPaolo Bonzini <pbonzini@redhat.com>2019-07-05 13:48:48 +0200
commite9f2a760b158551bfbef6db31d2cae45ab8072e5 (patch)
tree290da330d8a559d9f8a3c8119299579c2fc35946 /arch/x86/kvm/mmu.c
parentd679b32611c0102ce33b9e1a4e4b94854ed1812a (diff)
KVM: x86: change kvm_mmu_page_get_gfn BUG_ON to WARN_ON
Note that in such a case it is quite likely that KVM will BUG_ON in __pte_list_remove when the VM is closed. However, there is no immediate risk of memory corruption in the host so a WARN_ON is enough and it lets you gather traces for debugging. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.c')
-rw-r--r--arch/x86/kvm/mmu.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 084c1a0d9f98..0629a89bb070 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1098,10 +1098,16 @@ static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index)
static void kvm_mmu_page_set_gfn(struct kvm_mmu_page *sp, int index, gfn_t gfn)
{
- if (sp->role.direct)
- BUG_ON(gfn != kvm_mmu_page_get_gfn(sp, index));
- else
+ if (!sp->role.direct) {
sp->gfns[index] = gfn;
+ return;
+ }
+
+ if (WARN_ON(gfn != kvm_mmu_page_get_gfn(sp, index)))
+ pr_err_ratelimited("gfn mismatch under direct page %llx "
+ "(expected %llx, got %llx)\n",
+ sp->gfn,
+ kvm_mmu_page_get_gfn(sp, index), gfn);
}
/*