[PATCH v9 031/105] KVM: x86/mmu: Make sync_page not use hard-coded 0 as the initial SPTE value

From: Isaku Yamahata <isaku.yamahata@intel.com>

FNAME(sync_page) in arch/x86/kvm/mmu/paging_tmpl.h assumes that the initial
shadow page table entry (SPTE) is zero.  Remove the assumption by using
SHADOW_NONPRESENT_VALUE that will be updated from 0 to non-zero value.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
 arch/x86/kvm/mmu/paging_tmpl.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index 39e0205e7300..4586de2cfe57 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -1036,7 +1036,8 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
 		gpa_t pte_gpa;
 		gfn_t gfn;
 
-		if (!sp->spt[i])
+		/* spt[i] has initial value of shadow page table allocation */
+		if (sp->spt[i] != SHADOW_NONPRESENT_VALUE)
 			continue;
 
 		pte_gpa = first_pte_gpa + i * sizeof(pt_element_t);
-- 
2.25.1

• [PATCH v9 001/105] KVM: VMX: Move out vmx_x86_ops to 'main.c' to wrap VMX and TDX
• [PATCH v9 002/105] KVM: x86: Refactor KVM VMX module init/exit functions
• [PATCH v9 003/105] KVM: TDX: Add placeholders for TDX VM/vcpu structure
• [PATCH v9 004/105] x86/virt/tdx: Add a helper function to return system wide info about TDX module
• [PATCH v9 005/105] KVM: TDX: Initialize the TDX module when loading the KVM intel kernel module
• [PATCH v9 006/105] KVM: x86: Introduce vm_type to differentiate default VMs from confidential VMs
• [PATCH v9 007/105] KVM: TDX: Make TDX VM type supported
• [PATCH v9 008/105] [MARKER] The start of TDX KVM patch series: TDX architectural definitions
• [PATCH v9 009/105] KVM: TDX: Define TDX architectural definitions
• [PATCH v9 010/105] KVM: TDX: Add TDX "architectural" error codes
• [PATCH v9 011/105] KVM: TDX: Add C wrapper functions for SEAMCALLs to the TDX module
• [PATCH v9 012/105] KVM: TDX: Add helper functions to print TDX SEAMCALL error
• [PATCH v9 013/105] [MARKER] The start of TDX KVM patch series: TD VM creation/destruction
• [PATCH v9 014/105] KVM: TDX: Stub in tdx.h with structs, accessors, and VMCS helpers
• [PATCH v9 015/105] x86/cpu: Add helper functions to allocate/free TDX private host key id
• [PATCH v9 016/105] KVM: TDX: create/destroy VM structure
• [PATCH v9 017/105] KVM: TDX: Refuse to unplug the last cpu on the package
• [PATCH v9 018/105] KVM: TDX: x86: Add ioctl to get TDX systemwide parameters
• [PATCH v9 019/105] KVM: TDX: Add place holder for TDX VM specific mem_enc_op ioctl
• [PATCH v9 020/105] KVM: TDX: initialize VM with TDX specific parameters
• [PATCH v9 021/105] KVM: TDX: Make pmu_intel.c ignore guest TD case
• [PATCH v9 022/105] [MARKER] The start of TDX KVM patch series: TD vcpu creation/destruction
• [PATCH v9 023/105] KVM: TDX: allocate/free TDX vcpu structure
• [PATCH v9 024/105] KVM: TDX: Do TDX specific vcpu initialization
• [PATCH v9 025/105] KVM: TDX: Use private memory for TDX
• [PATCH v9 026/105] [MARKER] The start of TDX KVM patch series: KVM MMU GPA shared bits
• [PATCH v9 027/105] KVM: x86/mmu: introduce config for PRIVATE KVM MMU
• [PATCH v9 028/105] KVM: x86/mmu: Add address conversion functions for TDX shared bit of GPA
• [PATCH v9 029/105] [MARKER] The start of TDX KVM patch series: KVM TDP refactoring for TDX
• [PATCH v9 030/105] KVM: x86/mmu: Replace hardcoded value 0 for the initial value for SPTE
• [PATCH v9 031/105] KVM: x86/mmu: Make sync_page not use hard-coded 0 as the initial SPTE value
• [PATCH v9 032/105] KVM: x86/mmu: Allow non-zero value for non-present SPTE and removed SPTE
• [PATCH v9 033/105] KVM: x86/mmu: Add Suppress VE bit to shadow_mmio_{value, mask}
• [PATCH v9 034/105] KVM: x86/mmu: Track shadow MMIO value on a per-VM basis
• [PATCH v9 035/105] KVM: TDX: Enable mmio spte caching always for TDX
• [PATCH v9 036/105] KVM: x86/mmu: Disallow fast page fault on private GPA
• [PATCH v9 037/105] KVM: x86/mmu: Allow per-VM override of the TDP max page level
• [PATCH v9 038/105] KVM: VMX: Introduce test mode related to EPT violation VE
• [PATCH v9 039/105] [MARKER] The start of TDX KVM patch series: KVM TDP MMU hooks
• [PATCH v9 040/105] KVM: x86/tdp_mmu: refactor kvm_tdp_mmu_map()
• [PATCH v9 041/105] KVM: x86/tdp_mmu: Init role member of struct kvm_mmu_page at allocation
• [PATCH v9 042/105] KVM: x86/mmu: Require TDP MMU for TDX
• [PATCH v9 043/105] KVM: x86/mmu: Add a new is_private member for union kvm_mmu_page_role
• [PATCH v9 044/105] KVM: x86/mmu: Add a private pointer to struct kvm_mmu_page
• [PATCH v9 045/105] KVM: x86/tdp_mmu: Don't zap private pages for unsupported cases
• [PATCH v9 046/105] KVM: x86/tdp_mmu: Support TDX private mapping for TDP MMU
• [PATCH v9 047/105] [MARKER] The start of TDX KVM patch series: TDX EPT violation
• [PATCH v9 048/105] KVM: x86/mmu: Disallow dirty logging for x86 TDX
• [PATCH v9 049/105] KVM: x86/tdp_mmu: Ignore unsupported mmu operation on private GFNs
• [PATCH v9 050/105] KVM: VMX: Split out guts of EPT violation to common/exposed function
• [PATCH v9 051/105] KVM: VMX: Move setting of EPT MMU masks to common VT-x code
• [PATCH v9 052/105] KVM: TDX: Add load_mmu_pgd method for TDX
• [PATCH v9 053/105] KVM: TDX: don't request KVM_REQ_APIC_PAGE_RELOAD
• [PATCH v9 054/105] KVM: x86/VMX: introduce vmx tlb_remote_flush and tlb_remote_flush_with_range
• [PATCH v9 055/105] KVM: TDX: TDP MMU TDX support
• [PATCH v9 056/105] [MARKER] The start of TDX KVM patch series: KVM TDP MMU MapGPA
• [PATCH v9 057/105] KVM: Add functions to set GFN to private or shared
• [PATCH v9 058/105] KVM: x86/mmu: Introduce kvm_mmu_map_tdp_page() for use by TDX
• [PATCH v9 059/105] KVM: x86/tdp_mmu: implement MapGPA hypercall for TDX
• [PATCH v9 060/105] [MARKER] The start of TDX KVM patch series: TD finalization
• [PATCH v9 061/105] KVM: TDX: Create initial guest memory
• [PATCH v9 062/105] KVM: TDX: Finalize VM initialization
• [PATCH v9 063/105] [MARKER] The start of TDX KVM patch series: TD vcpu enter/exit
• [PATCH v9 064/105] KVM: TDX: Add helper assembly function to TDX vcpu
• [PATCH v9 065/105] KVM: TDX: Implement TDX vcpu enter/exit path
• [PATCH v9 066/105] KVM: TDX: vcpu_run: save/restore host state(host kernel gs)
• [PATCH v9 067/105] KVM: TDX: restore host xsave state when exit from the guest TD
• [PATCH v9 068/105] KVM: x86: Allow to update cached values in kvm_user_return_msrs w/o wrmsr
• [PATCH v9 069/105] KVM: TDX: restore user ret MSRs
• [PATCH v9 070/105] [MARKER] The start of TDX KVM patch series: TD vcpu exits/interrupts/hypercalls
• [PATCH v9 071/105] KVM: TDX: complete interrupts after tdexit
• [PATCH v9 072/105] KVM: TDX: restore debug store when TD exit
• [PATCH v9 073/105] KVM: TDX: handle vcpu migration over logical processor
• [PATCH v9 074/105] KVM: x86: Add a switch_db_regs flag to handle TDX's auto-switched behavior
• [PATCH v9 075/105] KVM: TDX: Add support for find pending IRQ in a protected local APIC
• [PATCH v9 076/105] KVM: x86: Assume timer IRQ was injected if APIC state is proteced
• [PATCH v9 077/105] KVM: TDX: remove use of struct vcpu_vmx from posted_interrupt.c
• [PATCH v9 078/105] KVM: TDX: Implement interrupt injection
• [PATCH v9 079/105] KVM: TDX: Implements vcpu request_immediate_exit
• [PATCH v9 080/105] KVM: TDX: Implement methods to inject NMI
• [PATCH v9 081/105] KVM: VMX: Modify NMI and INTR handlers to take intr_info as function argument
• [PATCH v9 082/105] KVM: VMX: Move NMI/exception handler to common helper
• [PATCH v9 083/105] KVM: x86: Split core of hypercall emulation to helper function
• [PATCH v9 084/105] KVM: TDX: Add a place holder to handle TDX VM exit
• [PATCH v9 085/105] KVM: TDX: Retry seamcall when TDX_OPERAND_BUSY with operand SEPT
• [PATCH v9 086/105] KVM: TDX: handle EXIT_REASON_OTHER_SMI
• [PATCH v9 087/105] KVM: TDX: handle ept violation/misconfig exit
• [PATCH v9 088/105] KVM: TDX: handle EXCEPTION_NMI and EXTERNAL_INTERRUPT
• [PATCH v9 089/105] KVM: TDX: Add a place holder for handler of TDX hypercalls (TDG.VP.VMCALL)
• [PATCH v9 090/105] KVM: TDX: handle KVM hypercall with TDG.VP.VMCALL
• [PATCH v9 091/105] KVM: TDX: Handle TDX PV CPUID hypercall
• [PATCH v9 092/105] KVM: TDX: Handle TDX PV HLT hypercall
• [PATCH v9 093/105] KVM: TDX: Handle TDX PV port io hypercall
• [PATCH v9 094/105] KVM: TDX: Handle TDX PV MMIO hypercall
• [PATCH v9 095/105] KVM: TDX: Implement callbacks for MSR operations for TDX
• [PATCH v9 096/105] KVM: TDX: Handle TDX PV rdmsr/wrmsr hypercall
• [PATCH v9 097/105] KVM: TDX: Handle TDX PV report fatal error hypercall
• [PATCH v9 098/105] KVM: TDX: Handle TDX PV map_gpa hypercall
• [PATCH v9 099/105] KVM: TDX: Handle TDG.VP.VMCALL<GetTdVmCallInfo> hypercall
• [PATCH v9 100/105] KVM: TDX: Silently discard SMI request
• [PATCH v9 101/105] KVM: TDX: Silently ignore INIT/SIPI
• [PATCH v9 102/105] KVM: TDX: Add methods to ignore accesses to CPU state
• [PATCH v9 103/105] Documentation/virt/kvm: Document on Trust Domain Extensions(TDX)
• [PATCH v9 104/105] KVM: x86: design documentation on TDX support of x86 KVM TDP MMU
• [PATCH v9 105/105] [MARKER] the end of (the first phase of) TDX KVM patch series