0dde13a5cd
- kvm-s390x-Fix-leak-in-machine_set_loadparm.patch [RHEL-98555] - kvm-hw-s390x-ccw-device-Fix-memory-leak-in-loadparm-sett.patch [RHEL-98555] - kvm-target-i386-Update-EPYC-CPU-model-for-Cache-property.patch [RHEL-52650] - kvm-target-i386-Update-EPYC-Rome-CPU-model-for-Cache-pro.patch [RHEL-52650] - kvm-target-i386-Update-EPYC-Milan-CPU-model-for-Cache-pr.patch [RHEL-52650] - kvm-target-i386-Add-couple-of-feature-bits-in-CPUID_Fn80.patch [RHEL-52650] - kvm-target-i386-Update-EPYC-Genoa-for-Cache-property-per.patch [RHEL-52650] - kvm-target-i386-Add-support-for-EPYC-Turin-model.patch [RHEL-52650] - kvm-include-qemu-compiler-add-QEMU_UNINITIALIZED-attribu.patch [RHEL-95479] - kvm-hw-virtio-virtio-avoid-cost-of-ftrivial-auto-var-ini.patch [RHEL-95479] - kvm-block-skip-automatic-zero-init-of-large-array-in-ioq.patch [RHEL-95479] - kvm-chardev-char-fd-skip-automatic-zero-init-of-large-ar.patch [RHEL-95479] - kvm-chardev-char-pty-skip-automatic-zero-init-of-large-a.patch [RHEL-95479] - kvm-chardev-char-socket-skip-automatic-zero-init-of-larg.patch [RHEL-95479] - kvm-hw-audio-ac97-skip-automatic-zero-init-of-large-arra.patch [RHEL-95479] - kvm-hw-audio-cs4231a-skip-automatic-zero-init-of-large-a.patch [RHEL-95479] - kvm-hw-audio-es1370-skip-automatic-zero-init-of-large-ar.patch [RHEL-95479] - kvm-hw-audio-gus-skip-automatic-zero-init-of-large-array.patch [RHEL-95479] - kvm-hw-audio-marvell_88w8618-skip-automatic-zero-init-of.patch [RHEL-95479] - kvm-hw-audio-sb16-skip-automatic-zero-init-of-large-arra.patch [RHEL-95479] - kvm-hw-audio-via-ac97-skip-automatic-zero-init-of-large-.patch [RHEL-95479] - kvm-hw-char-sclpconsole-lm-skip-automatic-zero-init-of-l.patch [RHEL-95479] - kvm-hw-dma-xlnx_csu_dma-skip-automatic-zero-init-of-larg.patch [RHEL-95479] - kvm-hw-display-vmware_vga-skip-automatic-zero-init-of-la.patch [RHEL-95479] - kvm-hw-hyperv-syndbg-skip-automatic-zero-init-of-large-a.patch [RHEL-95479] - kvm-hw-misc-aspeed_hace-skip-automatic-zero-init-of-larg.patch [RHEL-95479] - kvm-hw-net-rtl8139-skip-automatic-zero-init-of-large-arr.patch [RHEL-95479] - kvm-hw-net-tulip-skip-automatic-zero-init-of-large-array.patch [RHEL-95479] - kvm-hw-net-virtio-net-skip-automatic-zero-init-of-large-.patch [RHEL-95479] - kvm-hw-net-xgamc-skip-automatic-zero-init-of-large-array.patch [RHEL-95479] - kvm-hw-nvme-ctrl-skip-automatic-zero-init-of-large-array.patch [RHEL-95479] - kvm-hw-ppc-pnv_occ-skip-automatic-zero-init-of-large-str.patch [RHEL-95479] - kvm-hw-ppc-spapr_tpm_proxy-skip-automatic-zero-init-of-l.patch [RHEL-95479] - kvm-hw-usb-hcd-ohci-skip-automatic-zero-init-of-large-ar.patch [RHEL-95479] - kvm-hw-scsi-lsi53c895a-skip-automatic-zero-init-of-large.patch [RHEL-95479] - kvm-hw-scsi-megasas-skip-automatic-zero-init-of-large-ar.patch [RHEL-95479] - kvm-hw-ufs-lu-skip-automatic-zero-init-of-large-array.patch [RHEL-95479] - kvm-net-socket-skip-automatic-zero-init-of-large-array.patch [RHEL-95479] - kvm-net-stream-skip-automatic-zero-init-of-large-array.patch [RHEL-95479] - kvm-hw-i386-amd_iommu-Isolate-AMDVI-PCI-from-amd-iommu-d.patch [RHEL-85649] - kvm-hw-i386-amd_iommu-Allow-migration-when-explicitly-cr.patch [RHEL-85649] - kvm-Enable-amd-iommu-device.patch [RHEL-85649] - kvm-ui-vnc-Update-display-update-interval-when-VM-state-.patch [RHEL-83883] - Resolves: RHEL-98555 ([s390x][RHEL10.1][ccw-device] there would be memory leak with virtio_blk disks) - Resolves: RHEL-52650 ([AMDSERVER 10.1 Feature] Turin: Qemu EPYC-Turin Model) - Resolves: RHEL-95479 (-ftrivial-auto-var-init=zero reduced performance) - Resolves: RHEL-85649 ([RHEL 10]Qemu/amd-iommu: Add ability to manually specify the AMDVI-PCI device) - Resolves: RHEL-83883 (Video stuck after switchover phase when play one video during migration)
53 lines
2.2 KiB
Diff
53 lines
2.2 KiB
Diff
From 3fafd694cf5df4fa7a9f4f48aad86748d18bd15a Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= <berrange@redhat.com>
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Date: Tue, 10 Jun 2025 13:37:03 +0100
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Subject: [PATCH 33/43] hw/ppc/spapr_tpm_proxy: skip automatic zero-init of
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large arrays
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Stefan Hajnoczi <stefanha@redhat.com>
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RH-MergeRequest: 381: Solve -ftrivial-auto-var-init performance regression with QEMU_UNINITIALIZED
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RH-Jira: RHEL-95479
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [25/31] fe7e91a1f74a696e03336cf3429042681c77c4c7 (stefanha/centos-stream-qemu-kvm)
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The 'tpm_execute' method has a pair of 4k arrays used for copying
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data between guest and host. Skip the automatic zero-init of these
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arrays to eliminate the performance overhead in the I/O hot path.
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The two arrays will be fully initialized when reading data from
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guest memory or reading data from the proxy FD.
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Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
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Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
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Message-id: 20250610123709.835102-26-berrange@redhat.com
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit 5dd9087fff74b5672526cad254e76f790fb35c7a)
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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---
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hw/ppc/spapr_tpm_proxy.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/hw/ppc/spapr_tpm_proxy.c b/hw/ppc/spapr_tpm_proxy.c
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index ceaa0acaa1..7472ff8709 100644
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--- a/hw/ppc/spapr_tpm_proxy.c
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+++ b/hw/ppc/spapr_tpm_proxy.c
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@@ -41,8 +41,8 @@ static ssize_t tpm_execute(SpaprTpmProxy *tpm_proxy, target_ulong *args)
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target_ulong data_in_size = args[2];
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uint64_t data_out = ppc64_phys_to_real(args[3]);
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target_ulong data_out_size = args[4];
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- uint8_t buf_in[TPM_SPAPR_BUFSIZE];
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- uint8_t buf_out[TPM_SPAPR_BUFSIZE];
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+ QEMU_UNINITIALIZED uint8_t buf_in[TPM_SPAPR_BUFSIZE];
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+ QEMU_UNINITIALIZED uint8_t buf_out[TPM_SPAPR_BUFSIZE];
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ssize_t ret;
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trace_spapr_tpm_execute(data_in, data_in_size, data_out, data_out_size);
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--
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2.39.3
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