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    Subject[PATCH 5.15 512/917] KVM: s390: pv: avoid stalls for kvm_s390_pv_init_vm
    Date
    From: Claudio Imbrenda <imbrenda@linux.ibm.com>

    [ Upstream commit 1e2aa46de526a5adafe580bca4c25856bb06f09e ]

    When the system is heavily overcommitted, kvm_s390_pv_init_vm might
    generate stall notifications.

    Fix this by using uv_call_sched instead of just uv_call. This is ok because
    we are not holding spinlocks.

    Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
    Fixes: 214d9bbcd3a672 ("s390/mm: provide memory management functions for protected KVM guests")
    Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
    Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
    Message-Id: <20210920132502.36111-4-imbrenda@linux.ibm.com>
    Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
    Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    arch/s390/kvm/pv.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
    index 0a854115100b4..00d272d134c24 100644
    --- a/arch/s390/kvm/pv.c
    +++ b/arch/s390/kvm/pv.c
    @@ -195,7 +195,7 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
    uvcb.conf_base_stor_origin = (u64)kvm->arch.pv.stor_base;
    uvcb.conf_virt_stor_origin = (u64)kvm->arch.pv.stor_var;

    - cc = uv_call(0, (u64)&uvcb);
    + cc = uv_call_sched(0, (u64)&uvcb);
    *rc = uvcb.header.rc;
    *rrc = uvcb.header.rrc;
    KVM_UV_EVENT(kvm, 3, "PROTVIRT CREATE VM: handle %llx len %llx rc %x rrc %x",
    --
    2.33.0


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