From: Jork Loeser <jloeser@linux.microsoft.com>
To: linux-hyperv@vger.kernel.org
Cc: x86@kernel.org, "K . Y . Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Long Li <longli@microsoft.com>, Thomas Gleixner <tglx@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H . Peter Anvin" <hpa@zytor.com>, Arnd Bergmann <arnd@arndb.de>,
Roman Kisel <romank@linux.microsoft.com>,
Michael Kelley <mhklinux@outlook.com>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
Jork Loeser <jloeser@linux.microsoft.com>
Subject: [PATCH 0/6] Hyper-V: kexec fixes for L1VH (mshv)
Date: Fri, 27 Mar 2026 13:19:11 -0700 [thread overview]
Message-ID: <20260327201920.2100427-1-jloeser@linux.microsoft.com> (raw)
This series fixes kexec support when Linux runs as an L1 Virtual Host
(L1VH) under Hyper-V, using the MSHV driver to manage child VMs.
1. A variable shadowing bug in vmbus that hides the cpuhp state used
for teardown.
2. Move hv_stimer_global_cleanup() from vmbus's hv_kexec_handler() to
hv_machine_shutdown(). This ensures stimer cleanup happens before
the vmbus unload.
3. LP/VP re-creation: after kexec, logical processors and virtual
processors already exist in the hypervisor. Detect this and skip
re-adding them.
4-5. SynIC cleanup: the MSHV driver manages its own SynIC resources
separately from vmbus. Add proper teardown of MSHV-owned SINTs,
SIMP, and SIEFP on kexec, scoped to only the resources MSHV
owns.
6. Debugfs stats pages: unmap the VP statistics overlay pages before
kexec to avoid stale mappings in the new kernel.
Jork Loeser (6):
Drivers: hv: vmbus: fix hyperv_cpuhp_online variable shadowing
x86/hyperv: move stimer cleanup to hv_machine_shutdown()
x86/hyperv: Skip LP/VP creation on kexec
mshv: limit SynIC management to MSHV-owned resources
mshv: clean up SynIC state on kexec for L1VH
mshv: unmap debugfs stats pages on kexec
arch/x86/kernel/cpu/mshyperv.c | 15 +++-
drivers/hv/hv_proc.c | 47 +++++++++++
drivers/hv/mshv_debugfs.c | 7 +-
drivers/hv/mshv_root_main.c | 22 ++---
drivers/hv/mshv_synic.c | 144 ++++++++++++++++++++++-----------
drivers/hv/vmbus_drv.c | 2 -
include/asm-generic/mshyperv.h | 10 +++
include/hyperv/hvgdk_mini.h | 1 +
include/hyperv/hvhdk_mini.h | 12 +++
9 files changed, 190 insertions(+), 70 deletions(-)
--
2.43.0
next reply other threads:[~2026-03-27 20:19 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-27 20:19 Jork Loeser [this message]
2026-03-27 20:19 ` [PATCH 1/6] Drivers: hv: vmbus: fix hyperv_cpuhp_online variable shadowing Jork Loeser
2026-03-27 20:19 ` [PATCH 2/6] x86/hyperv: move stimer cleanup to hv_machine_shutdown() Jork Loeser
2026-03-27 20:19 ` [PATCH 3/6] x86/hyperv: Skip LP/VP creation on kexec Jork Loeser
2026-03-27 20:19 ` [PATCH 4/6] mshv: limit SynIC management to MSHV-owned resources Jork Loeser
2026-03-27 20:19 ` [PATCH 5/6] mshv: clean up SynIC state on kexec for L1VH Jork Loeser
2026-03-27 20:19 ` [PATCH 6/6] mshv: unmap debugfs stats pages on kexec Jork Loeser
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