diff options
| author | Tom Lendacky <thomas.lendacky@amd.com> | 2021-09-30 23:42:01 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-13 09:42:03 +0200 |
| commit | 44976b5cb6af93c4ecb37e95665b3b16255ea8c8 (patch) | |
| tree | b74c60a78caa72e4a168083e122a06ae0ee98ec1 | |
| parent | 6665c1c5770fd351382c94bf206486c1d2cd160a (diff) | |
x86/sev: Return an error on a returned non-zero SW_EXITINFO1[31:0]
commit 06f2ac3d4219bbbfd93d79e01966a42053084f11 upstream.
After returning from a VMGEXIT NAE event, SW_EXITINFO1[31:0] is checked
for a value of 1, which indicates an error and that SW_EXITINFO2
contains exception information. However, future versions of the GHCB
specification may define new values for SW_EXITINFO1[31:0], so really
any non-zero value should be treated as an error.
Fixes: 597cfe48212a ("x86/boot/compressed/64: Setup a GHCB-based VC Exception handler")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org> # 5.10+
Link: https://lkml.kernel.org/r/efc772af831e9e7f517f0439b13b41f56bad8784.1633063321.git.thomas.lendacky@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/kernel/sev-shared.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index 9f90f460a28c..bf1033a62e48 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -130,6 +130,8 @@ static enum es_result sev_es_ghcb_hv_call(struct ghcb *ghcb, } else { ret = ES_VMM_ERROR; } + } else if (ghcb->save.sw_exit_info_1 & 0xffffffff) { + ret = ES_VMM_ERROR; } else { ret = ES_OK; } |