linux-kernel - [PATCH 1/5] KVM: x86: Add function to inject guest page fault with reserved bits set

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Date:   Thu, 27 Feb 2020 19:23:02 +0200
From:   Mohammed Gamal <mgamal@...hat.com>
To:     kvm@...r.kernel.org, pbonzini@...hat.com
Cc:     sean.j.christopherson@...el.com, vkuznets@...hat.com,
        wanpengli@...cent.com, jmattson@...gle.com, joro@...tes.org,
        linux-kernel@...r.kernel.org, Mohammed Gamal <mgamal@...hat.com>
Subject: [PATCH 1/5] KVM: x86: Add function to inject guest page fault with reserved bits set

Signed-off-by: Mohammed Gamal <mgamal@...hat.com>
---
 arch/x86/kvm/x86.c | 14 ++++++++++++++
 arch/x86/kvm/x86.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 359fcd395132..434c55a8b719 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10494,6 +10494,20 @@ u64 kvm_spec_ctrl_valid_bits(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_GPL(kvm_spec_ctrl_valid_bits);
 
+void kvm_inject_rsvd_bits_pf(struct kvm_vcpu *vcpu, gpa_t gpa)
+{
+	struct x86_exception fault;
+
+	fault.vector = PF_VECTOR;
+	fault.error_code_valid = true;
+	fault.error_code = PFERR_RSVD_MASK;
+	fault.nested_page_fault = false;
+	fault.address = gpa;
+
+	kvm_inject_page_fault(vcpu, &fault);
+}
+EXPORT_SYMBOL_GPL(kvm_inject_rsvd_bits_pf);
+
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio);
 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 3624665acee4..7d8ab28a6983 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -276,6 +276,7 @@ int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
 bool kvm_mtrr_check_gfn_range_consistency(struct kvm_vcpu *vcpu, gfn_t gfn,
 					  int page_num);
 bool kvm_vector_hashing_enabled(void);
+void kvm_inject_rsvd_bits_pf(struct kvm_vcpu *vcpu, gpa_t gpa);
 int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 			    int emulation_type, void *insn, int insn_len);
 enum exit_fastpath_completion handle_fastpath_set_msr_irqoff(struct kvm_vcpu *vcpu);
-- 
2.21.1