From: Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx>
Add API get_max_physaddr_bits(), this is necessary used to calculate
the reserved bits for EPT entry.
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx>
---
arch/x86/kvm/vmx/pkvm/hyp/memory.c | 21 +++++++++++++++++++++
arch/x86/kvm/vmx/pkvm/hyp/memory.h | 2 ++
2 files changed, 23 insertions(+)
diff --git a/arch/x86/kvm/vmx/pkvm/hyp/memory.c b/arch/x86/kvm/vmx/pkvm/hyp/memory.c
index 43fc39d44c3d..9a9616ac4cc3 100644
--- a/arch/x86/kvm/vmx/pkvm/hyp/memory.c
+++ b/arch/x86/kvm/vmx/pkvm/hyp/memory.c
@@ -10,9 +10,11 @@
#include "memory.h"
#include "pgtable.h"
#include "pkvm_hyp.h"
+#include "cpu.h"
unsigned long __page_base_offset;
unsigned long __symbol_base_offset;
+static u8 max_physaddr_bits;
unsigned int hyp_memblock_nr;
struct memblock_region hyp_memory[HYP_MEMBLOCK_REGIONS];
@@ -285,3 +287,22 @@ int write_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, void *addr, unsigned int bytes)
{
return copy_gpa(vcpu, gpa, addr, bytes, false);
}
+
+u64 get_max_physaddr_bits(void)
+{
+ u32 eax, ebx, ecx, edx;
+
+ if (max_physaddr_bits)
+ return max_physaddr_bits;
+
+ eax = 0x80000000;
+ ecx = 0;
+ native_cpuid(&eax, &ebx, &ecx, &edx);
+ if (eax >= 0x80000008) {
+ eax = 0x80000008;
+ native_cpuid(&eax, &ebx, &ecx, &edx);
+ max_physaddr_bits = (u8)eax & 0xff;
+ }
+
+ return max_physaddr_bits;
+}
diff --git a/arch/x86/kvm/vmx/pkvm/hyp/memory.h b/arch/x86/kvm/vmx/pkvm/hyp/memory.h
index a95ae5f71841..b1062f3703e3 100644
--- a/arch/x86/kvm/vmx/pkvm/hyp/memory.h
+++ b/arch/x86/kvm/vmx/pkvm/hyp/memory.h
@@ -32,4 +32,6 @@ int write_gva(struct kvm_vcpu *vcpu, gva_t gva, void *addr,
int read_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, void *addr, unsigned int bytes);
int write_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, void *addr, unsigned int bytes);
+u64 get_max_physaddr_bits(void);
+
#endif
--
2.25.1
