diff options
Diffstat (limited to 'arch/x86/coco/sev/vc-shared.c')
| -rw-r--r-- | arch/x86/coco/sev/vc-shared.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/coco/sev/vc-shared.c b/arch/x86/coco/sev/vc-shared.c index 9b01c9ad81be..58b2f985d546 100644 --- a/arch/x86/coco/sev/vc-shared.c +++ b/arch/x86/coco/sev/vc-shared.c @@ -1,5 +1,9 @@ // SPDX-License-Identifier: GPL-2.0 +#ifndef __BOOT_COMPRESSED +#define has_cpuflag(f) cpu_feature_enabled(f) +#endif + static enum es_result vc_check_opcode_bytes(struct es_em_ctxt *ctxt, unsigned long exit_code) { @@ -546,6 +550,13 @@ static enum es_result vc_handle_cpuid(struct ghcb *ghcb, /* xgetbv will cause #GP - use reset value for xcr0 */ ghcb_set_xcr0(ghcb, 1); + if (has_cpuflag(X86_FEATURE_SHSTK) && regs->ax == 0xd && regs->cx == 1) { + struct msr m; + + raw_rdmsr(MSR_IA32_XSS, &m); + ghcb_set_xss(ghcb, m.q); + } + ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_CPUID, 0, 0); if (ret != ES_OK) return ret; |