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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2020-09-07 15:16:00 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2020-09-09 11:33:20 +0200 |
| commit | 2eb7dcf0ccc40ad3f39b000becf16661abf98102 (patch) | |
| tree | a46a1929b4dd75e3e2a1ed835b2bd6832f73c0d1 /arch | |
| parent | x86/sev-es: Handle MWAIT/MWAITX Events (diff) | |
| download | linux-2eb7dcf0ccc40ad3f39b000becf16661abf98102.tar.xz linux-2eb7dcf0ccc40ad3f39b000becf16661abf98102.zip | |
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 <thomas.lendacky@amd.com>
[ jroedel@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel <jroedel@suse.de>
Signed-off-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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/sev-es.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c index 2aea903ceb42..86cb4c5a7ad2 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; |