From: Willy Tarreau <w@1wt.eu>
Date: Wed, 22 Nov 2023 11:04:02 +0000 (+0100)
Subject: MINOR: debug: report any detected hypervisor in post_mortem
X-Git-Tag: v2.9-dev11~22
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ff9e06cd532bb86bfb6f73d4950c39540a56c925;p=thirdparty%2Fhaproxy.git

MINOR: debug: report any detected hypervisor in post_mortem

When the x86 CPU flags show the "hypervisor" flag, we know we're running
inside QEMU, VMware or possibly other flavors of hypervisors. In this
case we'll report either "qemu", "vmware" or "yes" for other ones in
the "virt_techno" field, based on the DMI hardware vendor name,
otherwise "no" when the flag is not found.
---

diff --git a/src/debug.c b/src/debug.c
index fe383442ed..5a8ed6b8ec 100644
--- a/src/debug.c
+++ b/src/debug.c
@@ -86,6 +86,7 @@ struct post_mortem {
 		char soc_vendor[64];    // SoC/CPU vendor from cpuinfo
 		char soc_model[64];     // SoC model when known and relevant
 		char cpu_model[64];     // CPU model when different from SoC
+		char virt_techno[16];   // when provided by cpuid
 		char cont_techno[16];   // empty, "no", "yes", "docker" or others
 	} platform;
 } post_mortem ALIGNED(256) = { };
@@ -470,6 +471,8 @@ static int debug_parse_cli_show_dev(char **args, char *payload, struct appctx *a
 		chunk_appendf(&trash, "  soc model: %s\n", post_mortem.platform.soc_model);
 	if (*post_mortem.platform.cpu_model)
 		chunk_appendf(&trash, "  cpu model: %s\n", post_mortem.platform.cpu_model);
+	if (*post_mortem.platform.virt_techno)
+		chunk_appendf(&trash, "  virtual machine: %s\n", post_mortem.platform.virt_techno);
 	if (*post_mortem.platform.cont_techno)
 		chunk_appendf(&trash, "  container: %s\n", post_mortem.platform.cont_techno);
 	if (*post_mortem.platform.utsname.sysname)
@@ -1964,6 +1967,7 @@ static void feed_post_mortem_linux()
 		uint cpu_family = 0, model = 0, stepping = 0;                                  // x86
 		char vendor_id[64] = "", model_name[64] = "";                                  // x86
 		char machine[64] = "", system_type[64] = "", cpu_model[64] = "";               // mips
+		const char *virt = "no";
 		char *p, *e, *v, *lf;
 
 		/* let's figure what CPU we're working with */
@@ -2009,6 +2013,16 @@ static void feed_post_mortem_linux()
 				strlcpy2(vendor_id, v, sizeof(vendor_id));
 			else if (strcmp(p, "model name") == 0)
 				strlcpy2(model_name, v, sizeof(model_name));
+			else if (strcmp(p, "flags") == 0) {
+				if (strstr(v, "hypervisor")) {
+					if (strncmp(post_mortem.platform.hw_vendor, "QEMU", 4) == 0)
+						virt = "qemu";
+					else if (strncmp(post_mortem.platform.hw_vendor, "VMware", 6) == 0)
+						virt = "vmware";
+					else
+						virt = "yes";
+				}
+			}
 
 			/* MIPS */
 			else if (strcmp(p, "system type") == 0)
@@ -2075,6 +2089,9 @@ static void feed_post_mortem_linux()
 				 "%sr%up%u", *cpu_model ? " " : "", cpu_variant, cpu_rev);
 
 		strlcpy2(post_mortem.platform.cpu_model, cpu_model, sizeof(post_mortem.platform.cpu_model));
+
+		if (*virt)
+			strlcpy2(post_mortem.platform.virt_techno, virt, sizeof(post_mortem.platform.virt_techno));
 	}
 #endif // __linux__
 }