Re: [PATCH 14/15] KVM: x86: Implement KVM_TRANSLATE2

On Tue, Sep 10, 2024, Nikolas Wipper wrote:

+int kvm_arch_vcpu_ioctl_translate2(struct kvm_vcpu *vcpu,

• 		    struct kvm_translation2 *tr)
  

+{

• int idx, set_bit_mode = 0, access = 0;
• struct x86_exception exception = { };
• gva_t vaddr = tr->linear_address;
• u16 status = 0;
• gpa_t gpa;
• if (tr->flags & KVM_TRANSLATE_FLAGS_SET_ACCESSED)

• set_bit_mode |= PWALK_SET_ACCESSED;
  

• if (tr->flags & KVM_TRANSLATE_FLAGS_SET_DIRTY)

• set_bit_mode |= PWALK_SET_DIRTY;
  

• if (tr->flags & KVM_TRANSLATE_FLAGS_FORCE_SET_ACCESSED)

• set_bit_mode |= PWALK_FORCE_SET_ACCESSED;
  

• if (tr->access & KVM_TRANSLATE_ACCESS_WRITE)

• access |= PFERR_WRITE_MASK;
  

• if (tr->access & KVM_TRANSLATE_ACCESS_USER)

• access |= PFERR_USER_MASK;
  

• if (tr->access & KVM_TRANSLATE_ACCESS_EXEC)

• access |= PFERR_FETCH_MASK;
  

WRITE and FETCH accesses need to be mutually exclusive.