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2  * AMD SEV support in kvm-unit-tests
9  * SPDX-License-Identifier: LGPL-2.0-or-later
59 	 * Extract C-Bit position from ebx[5:0]  in setup_amd_sev()
61 	 *   - Section " Function 8000_001Fh - Encrypted Memory Capabilities"  in setup_amd_sev()
82 		/* Test if SEV-ES is enabled */  in amd_sev_es_enabled()
102 	 * Copy UEFI's #VC IDT entry, so KVM-Unit-Tests can reuse it and does  in setup_amd_sev_es()
103 	 * not have to re-implement a #VC handler. Also update the #VC IDT code  in setup_amd_sev_es()
104 	 * segment to use KVM-Unit-Tests segments, KERNEL_CS, so that we do not  in setup_amd_sev_es()
105 	 * have to copy the UEFI GDT entries into KVM-Unit-Tests GDT.  in setup_amd_sev_es()
107 	 * TODO: Reusing UEFI #VC handler is a temporary workaround to simplify  in setup_amd_sev_es()
108 	 * the boot up process, the long-term solution is to implement a #VC  in setup_amd_sev_es()
109 	 * handler in kvm-unit-tests and load it, so that kvm-unit-tests does  in setup_amd_sev_es()
124 	 * SEV-ES guest uses GHCB page to communicate with the host. This page  in setup_ghcb_pte()
125 	 * must be unencrypted, i.e. its c-bit should be unset. To do so, this  in setup_ghcb_pte()
127 	 * found, and unsets the c-bit of GHCB's L1 pte.  in setup_ghcb_pte()
132 	/* Read the current GHCB page addr */  in setup_ghcb_pte()
141 		ghcb_base_addr = ghcb_addr & ~(LARGE_PAGE_SIZE - 1);  in setup_ghcb_pte()
153 	/* Unset c-bit in Level 1 GHCB pte */  in setup_ghcb_pte()
169 		return amd_sev_c_bit_pos - 1;  in get_amd_sev_addr_upperbound()