176 lines
4.9 KiB
C
176 lines
4.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* AMD SEV header common between the guest and the hypervisor.
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*
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* Author: Brijesh Singh <brijesh.singh@amd.com>
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*/
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#ifndef __ASM_X86_SEV_COMMON_H
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#define __ASM_X86_SEV_COMMON_H
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#define GHCB_MSR_INFO_POS 0
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#define GHCB_DATA_LOW 12
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#define GHCB_MSR_INFO_MASK (BIT_ULL(GHCB_DATA_LOW) - 1)
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#define GHCB_DATA(v) \
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(((unsigned long)(v) & ~GHCB_MSR_INFO_MASK) >> GHCB_DATA_LOW)
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/* SEV Information Request/Response */
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#define GHCB_MSR_SEV_INFO_RESP 0x001
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#define GHCB_MSR_SEV_INFO_REQ 0x002
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#define GHCB_MSR_SEV_INFO(_max, _min, _cbit) \
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/* GHCBData[63:48] */ \
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((((_max) & 0xffff) << 48) | \
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/* GHCBData[47:32] */ \
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(((_min) & 0xffff) << 32) | \
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/* GHCBData[31:24] */ \
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(((_cbit) & 0xff) << 24) | \
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GHCB_MSR_SEV_INFO_RESP)
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#define GHCB_MSR_INFO(v) ((v) & 0xfffUL)
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#define GHCB_MSR_PROTO_MAX(v) (((v) >> 48) & 0xffff)
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#define GHCB_MSR_PROTO_MIN(v) (((v) >> 32) & 0xffff)
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/* CPUID Request/Response */
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#define GHCB_MSR_CPUID_REQ 0x004
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#define GHCB_MSR_CPUID_RESP 0x005
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#define GHCB_MSR_CPUID_FUNC_POS 32
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#define GHCB_MSR_CPUID_FUNC_MASK 0xffffffff
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#define GHCB_MSR_CPUID_VALUE_POS 32
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#define GHCB_MSR_CPUID_VALUE_MASK 0xffffffff
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#define GHCB_MSR_CPUID_REG_POS 30
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#define GHCB_MSR_CPUID_REG_MASK 0x3
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#define GHCB_CPUID_REQ_EAX 0
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#define GHCB_CPUID_REQ_EBX 1
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#define GHCB_CPUID_REQ_ECX 2
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#define GHCB_CPUID_REQ_EDX 3
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#define GHCB_CPUID_REQ(fn, reg) \
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/* GHCBData[11:0] */ \
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(GHCB_MSR_CPUID_REQ | \
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/* GHCBData[31:12] */ \
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(((unsigned long)(reg) & 0x3) << 30) | \
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/* GHCBData[63:32] */ \
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(((unsigned long)fn) << 32))
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/* AP Reset Hold */
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#define GHCB_MSR_AP_RESET_HOLD_REQ 0x006
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#define GHCB_MSR_AP_RESET_HOLD_RESP 0x007
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/* GHCB GPA Register */
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#define GHCB_MSR_REG_GPA_REQ 0x012
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#define GHCB_MSR_REG_GPA_REQ_VAL(v) \
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/* GHCBData[63:12] */ \
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(((u64)((v) & GENMASK_ULL(51, 0)) << 12) | \
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/* GHCBData[11:0] */ \
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GHCB_MSR_REG_GPA_REQ)
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#define GHCB_MSR_REG_GPA_RESP 0x013
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#define GHCB_MSR_REG_GPA_RESP_VAL(v) \
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/* GHCBData[63:12] */ \
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(((u64)(v) & GENMASK_ULL(63, 12)) >> 12)
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/*
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* SNP Page State Change Operation
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*
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* GHCBData[55:52] - Page operation:
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* 0x0001 Page assignment, Private
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* 0x0002 Page assignment, Shared
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*/
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enum psc_op {
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SNP_PAGE_STATE_PRIVATE = 1,
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SNP_PAGE_STATE_SHARED,
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};
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#define GHCB_MSR_PSC_REQ 0x014
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#define GHCB_MSR_PSC_REQ_GFN(gfn, op) \
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/* GHCBData[55:52] */ \
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(((u64)((op) & 0xf) << 52) | \
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/* GHCBData[51:12] */ \
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((u64)((gfn) & GENMASK_ULL(39, 0)) << 12) | \
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/* GHCBData[11:0] */ \
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GHCB_MSR_PSC_REQ)
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#define GHCB_MSR_PSC_RESP 0x015
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#define GHCB_MSR_PSC_RESP_VAL(val) \
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/* GHCBData[63:32] */ \
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(((u64)(val) & GENMASK_ULL(63, 32)) >> 32)
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/* GHCB Hypervisor Feature Request/Response */
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#define GHCB_MSR_HV_FT_REQ 0x080
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#define GHCB_MSR_HV_FT_RESP 0x081
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#define GHCB_MSR_HV_FT_RESP_VAL(v) \
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/* GHCBData[63:12] */ \
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(((u64)(v) & GENMASK_ULL(63, 12)) >> 12)
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#define GHCB_HV_FT_SNP BIT_ULL(0)
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#define GHCB_HV_FT_SNP_AP_CREATION BIT_ULL(1)
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/* SNP Page State Change NAE event */
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#define VMGEXIT_PSC_MAX_ENTRY 253
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struct psc_hdr {
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u16 cur_entry;
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u16 end_entry;
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u32 reserved;
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} __packed;
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struct psc_entry {
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u64 cur_page : 12,
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gfn : 40,
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operation : 4,
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pagesize : 1,
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reserved : 7;
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} __packed;
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struct snp_psc_desc {
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struct psc_hdr hdr;
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struct psc_entry entries[VMGEXIT_PSC_MAX_ENTRY];
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} __packed;
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/* Guest message request error codes */
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#define SNP_GUEST_REQ_INVALID_LEN BIT_ULL(32)
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#define SNP_GUEST_REQ_ERR_BUSY BIT_ULL(33)
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#define GHCB_MSR_TERM_REQ 0x100
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#define GHCB_MSR_TERM_REASON_SET_POS 12
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#define GHCB_MSR_TERM_REASON_SET_MASK 0xf
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#define GHCB_MSR_TERM_REASON_POS 16
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#define GHCB_MSR_TERM_REASON_MASK 0xff
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#define GHCB_SEV_TERM_REASON(reason_set, reason_val) \
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/* GHCBData[15:12] */ \
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(((((u64)reason_set) & 0xf) << 12) | \
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/* GHCBData[23:16] */ \
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((((u64)reason_val) & 0xff) << 16))
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/* Error codes from reason set 0 */
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#define SEV_TERM_SET_GEN 0
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#define GHCB_SEV_ES_GEN_REQ 0
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#define GHCB_SEV_ES_PROT_UNSUPPORTED 1
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#define GHCB_SNP_UNSUPPORTED 2
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/* Linux-specific reason codes (used with reason set 1) */
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#define SEV_TERM_SET_LINUX 1
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#define GHCB_TERM_REGISTER 0 /* GHCB GPA registration failure */
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#define GHCB_TERM_PSC 1 /* Page State Change failure */
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#define GHCB_TERM_PVALIDATE 2 /* Pvalidate failure */
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#define GHCB_TERM_NOT_VMPL0 3 /* SNP guest is not running at VMPL-0 */
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#define GHCB_TERM_CPUID 4 /* CPUID-validation failure */
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#define GHCB_TERM_CPUID_HV 5 /* CPUID failure during hypervisor fallback */
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#define GHCB_RESP_CODE(v) ((v) & GHCB_MSR_INFO_MASK)
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/*
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* Error codes related to GHCB input that can be communicated back to the guest
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* by setting the lower 32-bits of the GHCB SW_EXITINFO1 field to 2.
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*/
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#define GHCB_ERR_NOT_REGISTERED 1
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#define GHCB_ERR_INVALID_USAGE 2
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#define GHCB_ERR_INVALID_SCRATCH_AREA 3
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#define GHCB_ERR_MISSING_INPUT 4
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#define GHCB_ERR_INVALID_INPUT 5
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#define GHCB_ERR_INVALID_EVENT 6
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#endif
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