virt-what/SOURCES/0018-Add-support-for-detecting-protected-virtualization-o.patch

67 lines
1.6 KiB
Diff

From d1cedcffeeff58f33aa467d62c0347ce7073aa4e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= <berrange@redhat.com>
Date: Fri, 2 Aug 2024 16:07:46 +0100
Subject: [PATCH] Add support for detecting protected virtualization on s390x
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
(cherry picked from commit 037689fbe95e403b050c1eb736ebc8fdc2e601a5)
---
virt-what-cvm.c | 21 ++++++++++++++++++++-
virt-what-cvm.pod | 5 +++++
2 files changed, 25 insertions(+), 1 deletion(-)
diff --git a/virt-what-cvm.c b/virt-what-cvm.c
index 0daa6ac35..320df478b 100644
--- a/virt-what-cvm.c
+++ b/virt-what-cvm.c
@@ -295,7 +295,26 @@ cpu_sig (void)
cpu_sig_intel ();
}
-#else /* !x86_64 */
+#elif defined(__s390x__)
+
+#define SYSFS_PROT_VIRT "/sys/firmware/uv/prot_virt_guest"
+
+static void
+cpu_sig (void)
+{
+ int fd = open("/sys/firmware/uv/prot_virt_guest", O_RDONLY);
+ char c;
+ if (fd < 0)
+ return;
+
+ if (read(fd, &c, 1) == 1 && c == '1')
+ puts("s390-protvirt");
+
+ close(fd);
+}
+
+
+#else /* ! x86_64 && ! s390x */
static void
cpu_sig (void)
diff --git a/virt-what-cvm.pod b/virt-what-cvm.pod
index 70213abd7..00e21cb70 100644
--- a/virt-what-cvm.pod
+++ b/virt-what-cvm.pod
@@ -60,6 +60,11 @@ paired with B<amd-sev-snp>.
Status: tested on Microsoft Azure SEV-SNP & TDX CVM
+=item B<s390x-protvirt>
+
+This is a confidential guest running on s390x with the
+Protected Virtualization (Secure Execution) technology
+
=back
=head1 EXIT STATUS
--
2.43.0