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From fa2237b9987c39147704274937895547c8c8d647 Mon Sep 17 00:00:00 2001
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From: Andrew Jones <drjones@redhat.com>
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Date: Tue, 31 Mar 2015 11:08:13 +0200
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Subject: [PATCH] ARM: detect-virt: detect QEMU/KVM
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QEMU/KVM guests do not have hypervisor nodes, but they do have
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fw-cfg nodes (since qemu v2.3.0-rc0). fw-cfg nodes are documented,
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see kernel doc Documentation/devicetree/bindings/arm/fw-cfg.txt,
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and therefore we should be able to rely on it in this detection.
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Unfortunately, we currently don't have enough information in the
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DT, or elsewhere, to determine if we're using KVM acceleration
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with QEMU or not, so we can only report 'qemu' at this time, even
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if KVM is in use. This shouldn't really matter in practice though,
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because if detect-virt is used interactively it will be clear to
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the user whether or not KVM acceleration is present by the overall
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speed of the guest. If used by a script, then the script's behavior
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should not change whether it's 'qemu' or 'kvm'. QEMU emulated
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guests and QEMU/KVM guests of the same type should behave
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identically, only the speed at which they run should differ.
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Cherry-picked from: ce09c71d56a11
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Resolves: #1207773
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---
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src/shared/virt.c | 17 +++++++++++++++++
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1 file changed, 17 insertions(+)
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diff --git a/src/shared/virt.c b/src/shared/virt.c
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index 712523210..54c465520 100644
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--- a/src/shared/virt.c
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+++ b/src/shared/virt.c
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@@ -115,6 +115,23 @@ static int detect_vm_devicetree(const char **_id) {
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*_id = "xen";
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return 1;
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}
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+ } else if (r == -ENOENT) {
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+ _cleanup_closedir_ DIR *dir = NULL;
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+ struct dirent *dent;
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+
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+ dir = opendir("/proc/device-tree");
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+ if (!dir) {
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+ if (errno == ENOENT)
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+ return 0;
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+ return -errno;
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+ }
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+
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+ FOREACH_DIRENT(dent, dir, return -errno) {
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+ if (strstr(dent->d_name, "fw-cfg")) {
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+ *_id = "qemu";
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+ return 1;
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+ }
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+ }
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}
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#endif
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return 0;
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