KVM: SVM: Unconditionally sync GPRs to GHCB on VMRUN of SEV-ES guest

[linux-2.6-microblaze.git] / arch / x86 / kvm / svm / sev.c

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index c8ffdbc..ac652bc 100644 (file)
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -1415,16 +1415,13 @@ static void sev_es_sync_to_ghcb(struct vcpu_svm *svm)
         * to be returned:
         *   GPRs RAX, RBX, RCX, RDX
         *
-        * Copy their values to the GHCB if they are dirty.
+        * Copy their values, even if they may not have been written during the
+        * VM-Exit.  It's the guest's responsibility to not consume random data.
         */
-       if (kvm_register_is_dirty(vcpu, VCPU_REGS_RAX))
-               ghcb_set_rax(ghcb, vcpu->arch.regs[VCPU_REGS_RAX]);
-       if (kvm_register_is_dirty(vcpu, VCPU_REGS_RBX))
-               ghcb_set_rbx(ghcb, vcpu->arch.regs[VCPU_REGS_RBX]);
-       if (kvm_register_is_dirty(vcpu, VCPU_REGS_RCX))
-               ghcb_set_rcx(ghcb, vcpu->arch.regs[VCPU_REGS_RCX]);
-       if (kvm_register_is_dirty(vcpu, VCPU_REGS_RDX))
-               ghcb_set_rdx(ghcb, vcpu->arch.regs[VCPU_REGS_RDX]);
+       ghcb_set_rax(ghcb, vcpu->arch.regs[VCPU_REGS_RAX]);
+       ghcb_set_rbx(ghcb, vcpu->arch.regs[VCPU_REGS_RBX]);
+       ghcb_set_rcx(ghcb, vcpu->arch.regs[VCPU_REGS_RCX]);
+       ghcb_set_rdx(ghcb, vcpu->arch.regs[VCPU_REGS_RDX]);
 }
 
 static void sev_es_sync_from_ghcb(struct vcpu_svm *svm)