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Subject[PATCH 15/16] KVM: x86/mmu: WARN on an invalid root_hpa
Date
WARN on the existing invalid root_hpa checks in __direct_map() and
FNAME(fetch). The "legitimate" path that invalidated root_hpa in the
middle of a page fault is long since gone, i.e. it should no longer be
impossible to invalidate in the middle of a page fault[*].

The root_hpa checks were added by two related commits

989c6b34f6a94 ("KVM: MMU: handle invalid root_hpa at __direct_map")
37f6a4e237303 ("KVM: x86: handle invalid root_hpa everywhere")

to fix a bug where nested_vmx_vmexit() could be called *in the middle*
of a page fault. At the time, vmx_interrupt_allowed(), which was and
still is used by kvm_can_do_async_pf() via ->interrupt_allowed(),
directly invoked nested_vmx_vmexit() to switch from L2 to L1 to emulate
a VM-Exit on a pending interrupt. Emulating the nested VM-Exit resulted
in root_hpa being invalidated by kvm_mmu_reset_context() without
explicitly terminating the page fault.

Now that root_hpa is checked for validity by kvm_mmu_page_fault(), WARN
on an invalid root_hpa to detect any flows that reset the MMU while
handling a page fault. The broken vmx_interrupt_allowed() behavior has
long since been fixed and resetting the MMU during a page fault should
not be considered legal behavior.

[*] It's actually technically possible in FNAME(page_fault)() because it
calls inject_page_fault() when the guest translation is invalid, but
in that case the page fault handling is immediately terminated.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/mmu/mmu.c | 2 +-
arch/x86/kvm/mmu/paging_tmpl.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 5e8666d25053..88fd1022731f 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3387,7 +3387,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t gpa, int write,
gfn_t gfn = gpa >> PAGE_SHIFT;
gfn_t base_gfn = gfn;

- if (!VALID_PAGE(vcpu->arch.mmu->root_hpa))
+ if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)))
return RET_PF_RETRY;

if (likely(max_level > PT_PAGE_TABLE_LEVEL))
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index 3b0ba2a77e28..b53bed3c901c 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -637,7 +637,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gpa_t addr,
if (FNAME(gpte_changed)(vcpu, gw, top_level))
goto out_gpte_changed;

- if (!VALID_PAGE(vcpu->arch.mmu->root_hpa))
+ if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)))
goto out_gpte_changed;

for (shadow_walk_init(&it, vcpu, addr);
--
2.24.0
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