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| author | Claudio Imbrenda <imbrenda@linux.ibm.com> | 2023-05-10 12:55:31 +0200 |
|---|---|---|
| committer | Thomas Huth <thuth@redhat.com> | 2023-05-16 09:14:18 +0200 |
| commit | 88693ab2a53f2f3d25cb39a7b5034ab391bc5a81 (patch) | |
| tree | 499b8fdb5d96efc7c19411b66dc65f9ea22ee5bf /hw | |
| parent | 80bd81cadd127c1e2fc784612a52abe392670ba4 (diff) | |
| download | qemu-88693ab2a53f2f3d25cb39a7b5034ab391bc5a81.zip qemu-88693ab2a53f2f3d25cb39a7b5034ab391bc5a81.tar.gz qemu-88693ab2a53f2f3d25cb39a7b5034ab391bc5a81.tar.bz2 | |
s390x/pv: Fix spurious warning with asynchronous teardown
Kernel commit 292a7d6fca33 ("KVM: s390: pv: fix asynchronous teardown
for small VMs") causes the KVM_PV_ASYNC_CLEANUP_PREPARE ioctl to fail
if the VM is not larger than 2GiB. QEMU would attempt it and fail,
print an error message, and then proceed with a normal teardown.
Avoid attempting to use asynchronous teardown altogether when the VM is
not larger than 2 GiB. This will avoid triggering the error message and
also avoid pointless overhead; normal teardown is fast enough for small
VMs.
Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Fixes: c3a073c610 ("s390x/pv: Add support for asynchronous teardown for reboot")
Link: https://lore.kernel.org/all/20230421085036.52511-2-imbrenda@linux.ibm.com/
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-Id: <20230510105531.30623-2-imbrenda@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
[thuth: Fix inline function parameter in pv.h]
Signed-off-by: Thomas Huth <thuth@redhat.com>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/s390x/pv.c | 10 | ||||
| -rw-r--r-- | hw/s390x/s390-virtio-ccw.c | 2 |
2 files changed, 9 insertions, 3 deletions
diff --git a/hw/s390x/pv.c b/hw/s390x/pv.c index 49ea382..b63f378 100644 --- a/hw/s390x/pv.c +++ b/hw/s390x/pv.c @@ -13,6 +13,7 @@ #include <linux/kvm.h> +#include "qemu/units.h" #include "qapi/error.h" #include "qemu/error-report.h" #include "sysemu/kvm.h" @@ -115,7 +116,7 @@ static void *s390_pv_do_unprot_async_fn(void *p) return NULL; } -bool s390_pv_vm_try_disable_async(void) +bool s390_pv_vm_try_disable_async(S390CcwMachineState *ms) { /* * t is only needed to create the thread; once qemu_thread_create @@ -123,7 +124,12 @@ bool s390_pv_vm_try_disable_async(void) */ QemuThread t; - if (!kvm_check_extension(kvm_state, KVM_CAP_S390_PROTECTED_ASYNC_DISABLE)) { + /* + * If the feature is not present or if the VM is not larger than 2 GiB, + * KVM_PV_ASYNC_CLEANUP_PREPARE fill fail; no point in attempting it. + */ + if ((MACHINE(ms)->maxram_size <= 2 * GiB) || + !kvm_check_extension(kvm_state, KVM_CAP_S390_PROTECTED_ASYNC_DISABLE)) { return false; } if (s390_pv_cmd(KVM_PV_ASYNC_CLEANUP_PREPARE, NULL) != 0) { diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index e6f2c62..2516b89 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -330,7 +330,7 @@ static inline void s390_do_cpu_ipl(CPUState *cs, run_on_cpu_data arg) static void s390_machine_unprotect(S390CcwMachineState *ms) { - if (!s390_pv_vm_try_disable_async()) { + if (!s390_pv_vm_try_disable_async(ms)) { s390_pv_vm_disable(); } ms->pv = false; |