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target/arm/kvm: Retry KVM_CREATE_VM call if it fails EINTR 

Occasionally the KVM_CREATE_VM ioctl can return EINTR, even though
there is no pending signal to be taken. In commit 94ccff1338
we added a retry-on-EINTR loop to the KVM_CREATE_VM call in the
generic KVM code. Adopt the same approach for the use of the
ioctl in the Arm-specific KVM code (where we use it to create a
scratch VM for probing for various things).

For more information, see the mailing list thread:
https://lore.kernel.org/qemu-devel/8735e0s1zw.wl-maz@kernel.org/

Reported-by: Vitaly Chikunov <vt@altlinux.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Vitaly Chikunov <vt@altlinux.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Message-id: 20220930113824.1933293-1-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2022-09-30 12:38:24 +01:00
parent f1d33f55c4
commit bbde13cd14
1 changed files with 3 additions and 1 deletions
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4
target/arm/kvm.c
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@ -79,7 +79,9 @@ bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
if (max_vm_pa_size < 0) {
max_vm_pa_size = 0;
}
vmfd = ioctl(kvmfd, KVM_CREATE_VM, max_vm_pa_size);
do {
vmfd = ioctl(kvmfd, KVM_CREATE_VM, max_vm_pa_size);
} while (vmfd == -1 && errno == EINTR);
if (vmfd < 0) {
goto err;
}