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KVM: SVM: Add VMLOAD and VMSAVE handlers

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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>
This commit is contained in:
Alexander Graf 2008-11-25 20:17:06 +01:00 committed by Avi Kivity
parent b286d5d8b0
commit 5542675baa
1 changed files with 58 additions and 2 deletions
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60
arch/x86/kvm/svm.c
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@ -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,