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x86/sev-es: Handle #AC Events
Implement a handler for #VC exceptions caused by #AC exceptions. The #AC exception is just forwarded to do_alignment_check() and not pushed down to the hypervisor, as requested by the SEV-ES GHCB Standardization Specification. Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20200907131613.12703-61-joro@8bytes.org
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1 changed files with 19 additions and 0 deletions
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@ -909,6 +909,19 @@ static enum es_result vc_handle_vmmcall(struct ghcb *ghcb,
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return ES_OK;
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return ES_OK;
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}
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}
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static enum es_result vc_handle_trap_ac(struct ghcb *ghcb,
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struct es_em_ctxt *ctxt)
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{
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/*
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* Calling ecx_alignment_check() directly does not work, because it
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* enables IRQs and the GHCB is active. Forward the exception and call
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* it later from vc_forward_exception().
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*/
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ctxt->fi.vector = X86_TRAP_AC;
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ctxt->fi.error_code = 0;
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return ES_EXCEPTION;
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}
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static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
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static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
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struct ghcb *ghcb,
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struct ghcb *ghcb,
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unsigned long exit_code)
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unsigned long exit_code)
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@ -922,6 +935,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
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case SVM_EXIT_WRITE_DR7:
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case SVM_EXIT_WRITE_DR7:
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result = vc_handle_dr7_write(ghcb, ctxt);
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result = vc_handle_dr7_write(ghcb, ctxt);
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break;
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break;
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case SVM_EXIT_EXCP_BASE + X86_TRAP_AC:
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result = vc_handle_trap_ac(ghcb, ctxt);
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break;
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case SVM_EXIT_RDTSC:
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case SVM_EXIT_RDTSC:
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case SVM_EXIT_RDTSCP:
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case SVM_EXIT_RDTSCP:
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result = vc_handle_rdtsc(ghcb, ctxt, exit_code);
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result = vc_handle_rdtsc(ghcb, ctxt, exit_code);
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@ -981,6 +997,9 @@ static __always_inline void vc_forward_exception(struct es_em_ctxt *ctxt)
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case X86_TRAP_UD:
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case X86_TRAP_UD:
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exc_invalid_op(ctxt->regs);
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exc_invalid_op(ctxt->regs);
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break;
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break;
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case X86_TRAP_AC:
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exc_alignment_check(ctxt->regs, error_code);
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break;
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default:
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default:
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pr_emerg("Unsupported exception in #VC instruction emulation - can't continue\n");
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pr_emerg("Unsupported exception in #VC instruction emulation - can't continue\n");
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BUG();
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BUG();
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