iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86/sev-es: Handle VMMCALL Events

Browse Source 
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
This commit is contained in:
Tom Lendacky 2020-09-07 15:16:00 +02:00 committed by Borislav Petkov
parent ded476bbe2
commit 2eb7dcf0cc
1 changed files with 23 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/x86/kernel/sev-es.c
View File

@ -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;