The following commit has been merged into the x86/seves branch of tip: Commit-ID: 2eb7dcf0ccc40ad3f39b000becf16661abf98102 Gitweb: https://git.kernel.org/tip/2eb7dcf0ccc40ad3f39b000becf16661abf98102 Author: Tom Lendacky <[email protected]> AuthorDate: Mon, 07 Sep 2020 15:16:00 +02:00 Committer: Borislav Petkov <[email protected]> CommitterDate: Wed, 09 Sep 2020 11:33:20 +02:00
x86/sev-es: Handle VMMCALL Events 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 <[email protected]> [ [email protected]: Adapt to #VC handling infrastructure ] Co-developed-by: Joerg Roedel <[email protected]> Signed-off-by: Joerg Roedel <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Link: https://lkml.kernel.org/r/[email protected] --- arch/x86/kernel/sev-es.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c index 2aea903..86cb4c5 100644 --- a/arch/x86/kernel/sev-es.c +++ b/arch/x86/kernel/sev-es.c @@ -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;
