KVM: SVM: Add emulation support for #GP triggered by SVM instructions
While running SVM related instructions (VMRUN/VMSAVE/VMLOAD), some AMD CPUs check EAX against reserved memory regions (e.g. SMM memory on host) before checking VMCB's instruction intercept. If EAX falls into such memory areas, #GP is triggered before VMEXIT. This causes problem under nested virtualization. To solve this problem, KVM needs to trap #GP and check the instructions triggering #GP. For VM execution instructions, KVM emulates these instructions. Co-developed-by: Wei Huang <wei.huang2@amd.com> Signed-off-by: Wei Huang <wei.huang2@amd.com> Signed-off-by: Bandan Das <bsd@redhat.com> Message-Id: <20210126081831.570253-3-wei.huang2@amd.com> [Conditionally enable #GP intercept. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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