hv: remove cr3 handling from cr_access_vmexit_handler

Guest CR3 read/write operations are not trapped.
Remove CR3 handling in cr_access_vmexit_handler.
Also remove unused API vmx_read_cr3.

Signed-off-by: Binbin Wu <binbin.wu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>

Author: binbinwu1

hypervisor/arch/x86/vmexit.c

@@ -292,21 +292,10 @@ int cr_access_vmexit_handler(struct vcpu *vcpu)
 		/* mov to cr0 */
 		vmx_write_cr0(vcpu, *regptr);
 		break;
-
-	case 0x03:
-		/* mov to cr3 */
-		vmx_write_cr3(vcpu, *regptr);
-		break;
-
 	case 0x04:
 		/* mov to cr4 */
 		vmx_write_cr4(vcpu, *regptr);
 		break;
-
-	case 0x13:
-		/* mov from cr3 */
-		vmx_read_cr3(vcpu, regptr);
-		break;
 #if 0
 	case 0x14:
 		/* mov from cr4 (this should not happen) */

hypervisor/arch/x86/vmx.c

@@ -287,15 +287,6 @@ int vmx_write_cr0(struct vcpu *vcpu, uint64_t value)
 	return 0;
 }
 
-int vmx_read_cr3(struct vcpu *vcpu, uint64_t *value)
-{
-	*value = vcpu->arch_vcpu.contexts[vcpu->arch_vcpu.cur_context].cr3;
-
-	pr_dbg("VMM: reading 0x%08x from CR3", *value);
-
-	return 0;
-}
-
 int vmx_write_cr3(struct vcpu *vcpu, uint64_t value)
 {
 	/* Write to guest's CR3 */

hypervisor/include/arch/x86/vmx.h

@@ -465,7 +465,6 @@ int exec_vmclear(void *addr);
 int exec_vmptrld(void *addr);
 
 int vmx_write_cr0(struct vcpu *vcpu, uint64_t cr0);
-int vmx_read_cr3(struct vcpu *vcpu, uint64_t *cr3);
 int vmx_write_cr3(struct vcpu *vcpu, uint64_t cr3);
 int vmx_write_cr4(struct vcpu *vcpu, uint64_t cr4);