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From 3014c7c11b6e64433fe9f3c463bd91e318ac96b6 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Wed, 9 Nov 2022 18:41:18 -0500
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Subject: [PATCH 2/2] target/arm/kvm: Retry KVM_CREATE_VM call if it fails
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EINTR
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 228: qemu-kvm: backport some aarch64 fixes
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RH-Bugzilla: 2132609
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Acked-by: Eric Auger <eric.auger@redhat.com>
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RH-Acked-by: Gavin Shan <gshan@redhat.com>
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RH-Commit: [2/2] 8494bbfb3fcd8693f56312f984d2964d1ca275c2 (jmaloy/qemu-kvm)
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BZ: https://bugzilla.redhat.com/show_bug.cgi?id=2132609
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Upstream: Merged
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commit bbde13cd14ad4eec18529ce0bf5876058464e124
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Author: Peter Maydell <peter.maydell@linaro.org>
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Date: Fri Sep 30 12:38:24 2022 +0100
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target/arm/kvm: Retry KVM_CREATE_VM call if it fails EINTR
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Occasionally the KVM_CREATE_VM ioctl can return EINTR, even though
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there is no pending signal to be taken. In commit 94ccff13382055
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we added a retry-on-EINTR loop to the KVM_CREATE_VM call in the
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generic KVM code. Adopt the same approach for the use of the
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ioctl in the Arm-specific KVM code (where we use it to create a
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scratch VM for probing for various things).
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For more information, see the mailing list thread:
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https://lore.kernel.org/qemu-devel/8735e0s1zw.wl-maz@kernel.org/
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Reported-by: Vitaly Chikunov <vt@altlinux.org>
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Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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Reviewed-by: Vitaly Chikunov <vt@altlinux.org>
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Reviewed-by: Eric Auger <eric.auger@redhat.com>
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Acked-by: Marc Zyngier <maz@kernel.org>
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Message-id: 20220930113824.1933293-1-peter.maydell@linaro.org
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(cherry picked from commit bbde13cd14ad4eec18529ce0bf5876058464e124)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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target/arm/kvm.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/target/arm/kvm.c b/target/arm/kvm.c
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index bbf1ce7ba3..1ae4e51055 100644
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--- a/target/arm/kvm.c
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+++ b/target/arm/kvm.c
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@@ -80,7 +80,9 @@ bool kvm_arm_create_scratch_host_vcpu(const uint32_t *cpus_to_try,
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if (max_vm_pa_size < 0) {
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max_vm_pa_size = 0;
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}
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- vmfd = ioctl(kvmfd, KVM_CREATE_VM, max_vm_pa_size);
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+ do {
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+ vmfd = ioctl(kvmfd, KVM_CREATE_VM, max_vm_pa_size);
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+ } while (vmfd == -1 && errno == EINTR);
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if (vmfd < 0) {
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goto err;
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}
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--
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2.37.3
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