Centralize the code to get cache disabled memtype when guest MTRRs are
honored. If a TDP honors guest MTRRs, it is required to call the provided
API to get the memtype for CR0.CD=1.
This is the preparation patch for later implementation of fine-grained gfn
zap for CR0.CD toggles when guest MTRRs are honored.
No functional change intended.
Signed-off-by: Yan Zhao <yan.y.zhao@xxxxxxxxx>
---
arch/x86/kvm/mtrr.c | 16 ++++++++++++++++
arch/x86/kvm/vmx/vmx.c | 10 +++++-----
arch/x86/kvm/x86.h | 2 ++
3 files changed, 23 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
index 3ce58734ad22..64c6daa659c8 100644
--- a/arch/x86/kvm/mtrr.c
+++ b/arch/x86/kvm/mtrr.c
@@ -721,3 +721,19 @@ bool kvm_mtrr_check_gfn_range_consistency(struct kvm_vcpu *vcpu, gfn_t gfn,
return type == mtrr_default_type(mtrr_state);
}
+
+/*
+ * this routine is supposed to be called when guest mtrrs are honored
+ */
+void kvm_honors_guest_mtrrs_get_cd_memtype(struct kvm_vcpu *vcpu,
+ u8 *type, bool *ipat)
+{
+ if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED)) {
+ *type = MTRR_TYPE_WRBACK;
+ *ipat = false;
+ } else {
+ *type = MTRR_TYPE_UNCACHABLE;
+ *ipat = true;
+ }
+}
+EXPORT_SYMBOL_GPL(kvm_honors_guest_mtrrs_get_cd_memtype);
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index c1e93678cea4..7fec1ee23b54 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7573,11 +7573,11 @@ static u8 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
return (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT) | VMX_EPT_IPAT_BIT;
if (kvm_read_cr0_bits(vcpu, X86_CR0_CD)) {
- if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
- return MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT;
- else
- return (MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT) |
- VMX_EPT_IPAT_BIT;
+ bool ipat;
+ u8 cache;
+
+ kvm_honors_guest_mtrrs_get_cd_memtype(vcpu, &cache, &ipat);
+ return cache << VMX_EPT_MT_EPTE_SHIFT | (ipat ? VMX_EPT_IPAT_BIT : 0);
}
return kvm_mtrr_get_guest_memory_type(vcpu, gfn) << VMX_EPT_MT_EPTE_SHIFT;
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 82e3dafc5453..e7733dc4dccc 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -313,6 +313,8 @@ int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data);
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);
+void kvm_honors_guest_mtrrs_get_cd_memtype(struct kvm_vcpu *vcpu,
+ u8 *type, bool *ipat);
bool kvm_vector_hashing_enabled(void);
void kvm_fixup_and_inject_pf_error(struct kvm_vcpu *vcpu, gva_t gva, u16 error_code);
int x86_decode_emulated_instruction(struct kvm_vcpu *vcpu, int emulation_type,
--
2.17.1
