x86/sev-es: Handle VMMCALL Events (2eb7dcf0) · Commits · 戴 / test

Implement a handler for #VC exceptions caused by VMMCALL instructions. This is only a starting point, VMMCALL emulation under SEV-ES needs further hypervisor-specific changes to provide additional state. [ bp: Drop "this patch". ] Signed-off-by:

Tom Lendacky <thomas.lendacky@amd.com> [ jroedel@suse.de: Adapt to #VC handling infrastructure ] Co-developed-by:

Joerg Roedel <jroedel@suse.de> Signed-off-by:

Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20200907131613.12703-60-joro@8bytes.org

arch/x86/kernel/sev-es.c

+23 −0

Original line number	Diff line number	Diff line
		@@ -889,6 +889,26 @@ static enum es_result vc_handle_mwait(struct ghcb *ghcb,
		return ES_OK;
		}

		static enum es_result vc_handle_vmmcall(struct ghcb *ghcb,
		struct es_em_ctxt *ctxt)
		{
		enum es_result ret;

		ghcb_set_rax(ghcb, ctxt->regs->ax);
		ghcb_set_cpl(ghcb, user_mode(ctxt->regs) ? 3 : 0);

		ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_VMMCALL, 0, 0);
		if (ret != ES_OK)
		return ret;

		if (!ghcb_rax_is_valid(ghcb))
		return ES_VMM_ERROR;

		ctxt->regs->ax = ghcb->save.rax;

		return ES_OK;
		}

		static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
		struct ghcb *ghcb,
		unsigned long exit_code)
		@@ -922,6 +942,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
		case SVM_EXIT_MSR:
		result = vc_handle_msr(ghcb, ctxt);
		break;
		case SVM_EXIT_VMMCALL:
		result = vc_handle_vmmcall(ghcb, ctxt);
		break;
		case SVM_EXIT_WBINVD:
		result = vc_handle_wbinvd(ghcb, ctxt);
		break;

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