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69 lines
2.5 KiB
69 lines
2.5 KiB
9 months ago
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From 05b145a8d5b1c2f796069cdd81826c00cf7c983e Mon Sep 17 00:00:00 2001
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From: Janosch Frank <frankja@linux.ibm.com>
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Date: Fri, 1 Sep 2023 11:48:51 +0000
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Subject: [PATCH 2/5] s390x: do a subsystem reset before the unprotect on
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reboot
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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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RH-Author: Thomas Huth <thuth@redhat.com>
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RH-MergeRequest: 321: Enable Secure Execution Crypto Passthrough for KVM on s390x
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RH-Bugzilla: 2111390
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RH-Acked-by: Cédric Le Goater <clg@redhat.com>
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RH-Commit: [2/5] ea430d236e1a20ddad7095d2e6d10f741f9a1907
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Bound APQNs have to be reset before tearing down the secure config via
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s390_machine_unprotect(). Otherwise the Ultravisor will return a error
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code.
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So let's do a subsystem_reset() which includes a AP reset before the
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unprotect call. We'll do a full device_reset() afterwards which will
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reset some devices twice. That's ok since we can't move the
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device_reset() before the unprotect as it includes a CPU clear reset
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which the Ultravisor does not expect at that point in time.
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Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
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Message-ID: <20230901114851.154357-1-frankja@linux.ibm.com>
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Tested-by: Viktor Mihajlovski <mihajlov@linux.ibm.com>
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Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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(cherry picked from commit ef1535901a07f2e49fa25c8bcee7f0b73801d824)
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Conflicts:
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hw/s390x/s390-virtio-ccw.c
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(contextual conflict due to missing commit 7966d70f6f6b)
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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---
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hw/s390x/s390-virtio-ccw.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
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index 412d73715a..17146469ee 100644
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--- a/hw/s390x/s390-virtio-ccw.c
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+++ b/hw/s390x/s390-virtio-ccw.c
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@@ -430,10 +430,20 @@ static void s390_machine_reset(MachineState *machine)
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switch (reset_type) {
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case S390_RESET_EXTERNAL:
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case S390_RESET_REIPL:
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+ /*
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+ * Reset the subsystem which includes a AP reset. If a PV
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+ * guest had APQNs attached the AP reset is a prerequisite to
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+ * unprotecting since the UV checks if all APQNs are reset.
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+ */
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+ subsystem_reset();
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if (s390_is_pv()) {
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s390_machine_unprotect(ms);
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}
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+ /*
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+ * Device reset includes CPU clear resets so this has to be
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+ * done AFTER the unprotect call above.
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+ */
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qemu_devices_reset();
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s390_crypto_reset();
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--
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2.41.0
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