51 lines
1.6 KiB
Diff
51 lines
1.6 KiB
Diff
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commit a404ac34768e975bd420d1eeac3811563da67e3f
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Author: Erik Skultety <eskultet@redhat.com>
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Date: Mon Jan 21 14:50:11 2019 +0100
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qemu: cgroup: Expose /dev/sev/ only to domains that require SEV
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SEV has a limit on number of concurrent guests. From security POV we
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should only expose resources (any resources for that matter) to domains
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that truly need them.
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Signed-off-by: Erik Skultety <eskultet@redhat.com>
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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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Index: libvirt-5.0.0/src/qemu/qemu_cgroup.c
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===================================================================
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--- libvirt-5.0.0.orig/src/qemu/qemu_cgroup.c
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+++ libvirt-5.0.0/src/qemu/qemu_cgroup.c
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@@ -692,6 +692,22 @@ qemuTeardownChardevCgroup(virDomainObjPt
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static int
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+qemuSetupSEVCgroup(virDomainObjPtr vm)
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+{
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+ qemuDomainObjPrivatePtr priv = vm->privateData;
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+ int ret;
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+
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+ if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_DEVICES))
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+ return 0;
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+
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+ ret = virCgroupAllowDevicePath(priv->cgroup, "/dev/sev",
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+ VIR_CGROUP_DEVICE_RW, false);
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+ virDomainAuditCgroupPath(vm, priv->cgroup, "allow", "/dev/sev",
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+ "rw", ret);
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+ return ret;
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+}
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+
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+static int
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qemuSetupDevicesCgroup(virDomainObjPtr vm)
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{
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qemuDomainObjPrivatePtr priv = vm->privateData;
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@@ -798,6 +814,9 @@ qemuSetupDevicesCgroup(virDomainObjPtr v
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goto cleanup;
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}
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+ if (vm->def->sev && qemuSetupSEVCgroup(vm) < 0)
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+ goto cleanup;
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+
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ret = 0;
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cleanup:
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virObjectUnref(cfg);
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