KVM: SVM: Add VMLOAD and VMSAVE handlers

This implements the VMLOAD and VMSAVE instructions, that usually surround
the VMRUN instructions. Both instructions load / restore the same elements,
so we only need to implement them once.

v2 fixes CPL checking and replaces memcpy by assignments
v3 makes use of the new permission checking

Acked-by: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 58 insertions, 2 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 59aaff1c9597..a83c94eb5771 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1243,6 +1243,62 @@ static int nested_svm_do(struct vcpu_svm *svm,
         return retval;
 }
 
+static int nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
+{
+        to_vmcb->save.fs = from_vmcb->save.fs;
+        to_vmcb->save.gs = from_vmcb->save.gs;
+        to_vmcb->save.tr = from_vmcb->save.tr;
+        to_vmcb->save.ldtr = from_vmcb->save.ldtr;
+        to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
+        to_vmcb->save.star = from_vmcb->save.star;
+        to_vmcb->save.lstar = from_vmcb->save.lstar;
+        to_vmcb->save.cstar = from_vmcb->save.cstar;
+        to_vmcb->save.sfmask = from_vmcb->save.sfmask;
+        to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
+        to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
+        to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
+
+        return 1;
+}
+
+static int nested_svm_vmload(struct vcpu_svm *svm, void *nested_vmcb,
+                             void *arg2, void *opaque)
+{
+        return nested_svm_vmloadsave((struct vmcb *)nested_vmcb, svm->vmcb);
+}
+
+static int nested_svm_vmsave(struct vcpu_svm *svm, void *nested_vmcb,
+                             void *arg2, void *opaque)
+{
+        return nested_svm_vmloadsave(svm->vmcb, (struct vmcb *)nested_vmcb);
+}
+
+static int vmload_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
+{
+        if (nested_svm_check_permissions(svm))
+                return 1;
+
+        svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
+        skip_emulated_instruction(&svm->vcpu);
+
+        nested_svm_do(svm, svm->vmcb->save.rax, 0, NULL, nested_svm_vmload);
+
+        return 1;
+}
+
+static int vmsave_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
+{
+        if (nested_svm_check_permissions(svm))
+                return 1;
+
+        svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
+        skip_emulated_instruction(&svm->vcpu);
+
+        nested_svm_do(svm, svm->vmcb->save.rax, 0, NULL, nested_svm_vmsave);
+
+        return 1;
+}
+
 static int stgi_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
 {
         if (nested_svm_check_permissions(svm))
@@ -1578,8 +1634,8 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm,
         [SVM_EXIT_SHUTDOWN]                     = shutdown_interception,
         [SVM_EXIT_VMRUN]                        = invalid_op_interception,
         [SVM_EXIT_VMMCALL]                      = vmmcall_interception,
-        [SVM_EXIT_VMLOAD]                       = invalid_op_interception,
-        [SVM_EXIT_VMSAVE]                       = invalid_op_interception,
+        [SVM_EXIT_VMLOAD]                       = vmload_interception,
+        [SVM_EXIT_VMSAVE]                       = vmsave_interception,
         [SVM_EXIT_STGI]                         = stgi_interception,
         [SVM_EXIT_CLGI]                         = clgi_interception,
         [SVM_EXIT_SKINIT]                       = invalid_op_interception,