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