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From 87b0f241db1eba0e9db1fd233c5ab8a8d0115979 Mon Sep 17 00:00:00 2001
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Message-Id: <87b0f241db1eba0e9db1fd233c5ab8a8d0115979@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Mon, 21 Mar 2022 13:33:06 +0100
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Subject: [PATCH] qemu_tpm: Do async IO when starting swtpm emulator
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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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When vTPM is secured via virSecret libvirt passes the secret
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value via an FD when swtpm is started (arguments --key and
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--migration-key). The writing of the secret into the FDs is
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handled via virCommand, specifically qemu_tpm calls
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virCommandSetSendBuffer()) and then virCommandRunAsync() spawns a
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thread to handle writing into the FD via
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virCommandDoAsyncIOHelper. But the thread is not created unless
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VIR_EXEC_ASYNC_IO flag is set, which it isn't. In order to fix
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it, virCommandDoAsyncIO() must be called.
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The credit goes to Marc-André Lureau
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<marcandre.lureau@redhat.com> who has done all the debugging and
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proposed fix in the bugzilla.
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2064115
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Fixes: a9c500d2b50c5c041a1bb6ae9724402cf1cec8fe
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Jiri Denemark <jdenemar@redhat.com>
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(cherry picked from commit 4d7bb0177a33c4e90fd001edfe27bc030354d875)
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2152188
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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---
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src/qemu/qemu_tpm.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/src/qemu/qemu_tpm.c b/src/qemu/qemu_tpm.c
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index 9c5d1ffed4..29dcb2ac0f 100644
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--- a/src/qemu/qemu_tpm.c
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+++ b/src/qemu/qemu_tpm.c
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@@ -923,6 +923,7 @@ qemuExtTPMStartEmulator(virQEMUDriver *driver,
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if (!(pidfile = qemuTPMEmulatorCreatePidFilename(cfg->swtpmStateDir, shortName)))
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return -1;
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+ virCommandDoAsyncIO(cmd);
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virCommandDaemonize(cmd);
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virCommandSetPidFile(cmd, pidfile);
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virCommandSetErrorFD(cmd, &errfd);
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--
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2.39.0
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