Commit 5d55cf78 authored by Tom Lendacky's avatar Tom Lendacky Committed by Borislav Petkov
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x86/sev-es: Handle RDPMC Events 



Implement a handler for #VC exceptions caused by RDPMC instructions.

Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
[ jroedel@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-56-joro@8bytes.org
parent 4711e7ac

arch/x86/kernel/sev-es.c

+22 −0
Original line number Diff line number Diff line
@@ -853,6 +853,25 @@ static enum es_result vc_handle_wbinvd(struct ghcb *ghcb, 
	return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WBINVD, 0, 0);

}



static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt)

{

	enum es_result ret;



	ghcb_set_rcx(ghcb, ctxt->regs->cx);



	ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_RDPMC, 0, 0);

	if (ret != ES_OK)

		return ret;



	if (!(ghcb_rax_is_valid(ghcb) && ghcb_rdx_is_valid(ghcb)))

		return ES_VMM_ERROR;



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

	ctxt->regs->dx = ghcb->save.rdx;



	return ES_OK;

}



static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,

					 struct ghcb *ghcb,

					 unsigned long exit_code)
@@ -870,6 +889,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, 
	case SVM_EXIT_RDTSCP:

		result = vc_handle_rdtsc(ghcb, ctxt, exit_code);

		break;

	case SVM_EXIT_RDPMC:

		result = vc_handle_rdpmc(ghcb, ctxt);

		break;

	case SVM_EXIT_CPUID:

		result = vc_handle_cpuid(ghcb, ctxt);

		break;