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cbd3d4f7c4
Version 2 of the GHCB specification added the advertisement of features that are supported by the hypervisor. If the hypervisor supports SEV-SNP then it must set the SEV-SNP features bit to indicate that the base functionality is supported. Check that feature bit while establishing the GHCB; if failed, terminate the guest. Version 2 of the GHCB specification adds several new Non-Automatic Exits (NAEs), most of them are optional except the hypervisor feature. Now that the hypervisor feature NAE is implemented, bump the GHCB maximum supported protocol version. While at it, move the GHCB protocol negotiation check from the #VC exception handler to sev_enable() so that all feature detection happens before the first #VC exception. While at it, document why the GHCB page cannot be setup from load_stage2_idt(). [ bp: Massage commit message. ] Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20220307213356.2797205-13-brijesh.singh@amd.com
107 lines
3.2 KiB
C
107 lines
3.2 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 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_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_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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