[PATCH v19 010/130] KVM: x86: Pass is_private to gmem hook of gmem_max_level

isaku.yamahata
2024-02-26T08:27:42Z

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

TDX wants to know the faulting address is shared or private so that the max
level is limited by Secure-EPT or not. Because fault->gfn doesn't include
shared bit, gfn doesn't tell if the faulting address is shared or not.
Pass is_private for TDX case.

TDX logic will be if (!is_private) return 0; else return PG_LEVEL_4K.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/include/asm/kvm_host.h | 3 ++-
arch/x86/kvm/mmu/mmu.c | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d15f5b4b1656..57ce89fc2740 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1797,7 +1797,8 @@ struct kvm_x86_ops {

gva_t (*get_untagged_addr)(struct kvm_vcpu *vcpu, gva_t gva, unsigned int flags);

- int (*gmem_max_level)(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn, u8 *max_level);
+ int (*gmem_max_level)(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn,
+ bool is_private, u8 *max_level);
};

struct kvm_x86_nested_ops {
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 1e5e12d2707d..22db1a9f528a 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4324,7 +4324,8 @@ static int kvm_faultin_pfn_private(struct kvm_vcpu *vcpu,

max_level = kvm_max_level_for_order(max_order);
r = static_call(kvm_x86_gmem_max_level)(vcpu->kvm, fault->pfn,
- fault->gfn, &max_level);
+ fault->gfn, fault->is_private,
+ &max_level);
if (r) {
kvm_release_pfn_clean(fault->pfn);
return r;
--
2.25.1