This is a note to let you know that I've just added the patch titled
virt/coco/sev-guest: Convert the sw_exit_info_2 checking to a switch-case
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
virt-coco-sev-guest-convert-the-sw_exit_info_2-checking-to-a-switch-case.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fa4ae42cc60a7dea30e8f2db444b808d80862345 Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@xxxxxxxxx>
Date: Thu, 16 Feb 2023 10:50:11 +0100
Subject: virt/coco/sev-guest: Convert the sw_exit_info_2 checking to a switch-case
From: Borislav Petkov (AMD) <bp@xxxxxxxxx>
commit fa4ae42cc60a7dea30e8f2db444b808d80862345 upstream.
snp_issue_guest_request() checks the value returned by the hypervisor in
sw_exit_info_2 and returns a different error depending on it.
Convert those checks into a switch-case to make it more readable when
more error values are going to be checked in the future.
No functional changes.
Signed-off-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Reviewed-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
Link: https://lore.kernel.org/r/20230307192449.24732-8-bp@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/sev.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -2210,15 +2210,21 @@ int snp_issue_guest_request(u64 exit_cod
goto e_put;
*fw_err = ghcb->save.sw_exit_info_2;
- if (ghcb->save.sw_exit_info_2) {
+ switch (*fw_err) {
+ case 0:
+ break;
+
+ case SNP_GUEST_REQ_INVALID_LEN:
/* Number of expected pages are returned in RBX */
- if (exit_code == SVM_VMGEXIT_EXT_GUEST_REQUEST &&
- ghcb->save.sw_exit_info_2 == SNP_GUEST_REQ_INVALID_LEN) {
+ if (exit_code == SVM_VMGEXIT_EXT_GUEST_REQUEST) {
input->data_npages = ghcb_get_rbx(ghcb);
ret = -ENOSPC;
- } else {
- ret = -EIO;
+ break;
}
+ fallthrough;
+ default:
+ ret = -EIO;
+ break;
}
e_put:
Patches currently in stable-queue which might be from bp@xxxxxxxxx are
queue-6.2/virt-coco-sev-guest-do-some-code-style-cleanups.patch
queue-6.2/virt-coco-sev-guest-add-throttling-awareness.patch
queue-6.2/virt-coco-sev-guest-simplify-extended-guest-request-handling.patch
queue-6.2/x86-mm-fix-use-of-uninitialized-buffer-in-sme_enable.patch
queue-6.2/ftrace-kcfi-define-ftrace_stub_graph-conditionally.patch
queue-6.2/x86-mce-make-sure-logged-mces-are-processed-after-sysfs-update.patch
queue-6.2/virt-coco-sev-guest-convert-the-sw_exit_info_2-checking-to-a-switch-case.patch
queue-6.2/virt-coco-sev-guest-remove-the-disable_vmpck-label-in-handle_guest_request.patch
queue-6.2/virt-coco-sev-guest-carve-out-the-request-issuing-logic-into-a-helper.patch
queue-6.2/virt-coco-sev-guest-check-sev_snp-attribute-at-probe-time.patch
