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qemu: Install backing store terminators for 'pflash' blockdevs

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The qemu driver does support qcow2 images for the firmware and nvram
pflash devices, but we do not do the full backing chain setup for them
as we don't expect that those images would actually have a backing
store. We don't tell that to qemu though which theoretically can lead to
qemu probing the backing store from the image itself. We don't want that
for now.

Deny qemu probing the backing store by installing a "terminator" empty
virStorageSource as 'backingStore' for pflash and nvram.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2024-11-04 17:45:54 +01:00
parent 6a8bcd1110
commit d57630c282
10 changed files with 20 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/qemu/qemu_domain.c
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@ -10236,11 +10236,13 @@ qemuDomainInitializePflashStorageSource(virDomainObj *vm,
pflash0->format = def->os.loader->format;
pflash0->path = g_strdup(def->os.loader->path);
pflash0->readonly = false;
pflash0->backingStore = virStorageSourceNew(); /* terminator */
virTristateBoolToBool(def->os.loader->readonly, &pflash0->readonly);
qemuBlockStorageSourceSetFormatNodename(pflash0, g_strdup("libvirt-pflash0-format"));
qemuBlockStorageSourceSetStorageNodename(pflash0, g_strdup("libvirt-pflash0-storage"));
if (def->os.loader->nvram) {
def->os.loader->nvram->backingStore = virStorageSourceNew(); /* terminator */
if (qemuDomainPrepareStorageSourceBlockdevNodename(NULL,
def->os.loader->nvram,
"libvirt-pflash1",

4
tests/qemuxmlconfdata/firmware-auto-efi-aarch64.aarch64-latest.abi-update.args
View File

@ -11,9 +11,9 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
-S \
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-guest/master-key.aes"}' \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/aarch64/QEMU_EFI-silent-pflash.qcow2","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage","backing":null}' \
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/guest_VARS.qcow2","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage","backing":null}' \
-machine virt-4.0,usb=off,gic-version=2,dump-guest-core=off,memory-backend=mach-virt.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,acpi=on \
-accel tcg \
-cpu cortex-a15 \

4
tests/qemuxmlconfdata/firmware-auto-efi-format-loader-qcow2-nvram-path.x86_64-latest.args
View File

@ -11,9 +11,9 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
-S \
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-guest/master-key.aes"}' \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/ovmf/OVMF_CODE_4M.secboot.qcow2","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage","backing":null}' \
-blockdev '{"driver":"file","filename":"/path/to/guest_VARS.qcow2","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage","backing":null}' \
-machine pc-q35-4.0,usb=off,smm=on,dump-guest-core=off,memory-backend=pc.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,acpi=on \
-accel kvm \
-cpu qemu64 \

4
tests/qemuxmlconfdata/firmware-auto-efi-format-loader-qcow2.x86_64-latest.args
View File

@ -11,9 +11,9 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
-S \
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-guest/master-key.aes"}' \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/ovmf/OVMF_CODE_4M.secboot.qcow2","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage","backing":null}' \
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/guest_VARS.qcow2","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage","backing":null}' \
-machine pc-q35-4.0,usb=off,smm=on,dump-guest-core=off,memory-backend=pc.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,acpi=on \
-accel kvm \
-cpu qemu64 \

4
tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-qcow2-network-nbd.x86_64-latest.args
View File

@ -11,9 +11,9 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
-S \
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-guest/master-key.aes"}' \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/ovmf/OVMF_CODE_4M.qcow2","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage","backing":null}' \
-blockdev '{"driver":"nbd","server":{"type":"inet","host":"example.org","port":"6000"},"node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage","backing":null}' \
-machine pc-i440fx-4.0,usb=off,dump-guest-core=off,memory-backend=pc.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,acpi=on \
-accel tcg \
-cpu qemu64 \

4
tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-qcow2-path.x86_64-latest.args
View File

@ -11,9 +11,9 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
-S \
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-guest/master-key.aes"}' \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/ovmf/OVMF_CODE_4M.secboot.qcow2","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage","backing":null}' \
-blockdev '{"driver":"file","filename":"/path/to/guest_VARS.qcow2","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage","backing":null}' \
-machine pc-q35-4.0,usb=off,smm=on,dump-guest-core=off,memory-backend=pc.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,acpi=on \
-accel kvm \
-cpu qemu64 \

4
tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-qcow2.x86_64-latest.args
View File

@ -11,9 +11,9 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
-S \
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-guest/master-key.aes"}' \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/ovmf/OVMF_CODE_4M.secboot.qcow2","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage","backing":null}' \
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/guest_VARS.qcow2","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage","backing":null}' \
-machine pc-q35-4.0,usb=off,smm=on,dump-guest-core=off,memory-backend=pc.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,acpi=on \
-accel kvm \
-cpu qemu64 \

4
tests/qemuxmlconfdata/firmware-auto-efi-loader-secure.x86_64-latest.abi-update.args
View File

@ -11,9 +11,9 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
-S \
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-guest/master-key.aes"}' \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/ovmf/OVMF_CODE_4M.secboot.qcow2","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage","backing":null}' \
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/guest_VARS.qcow2","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage","backing":null}' \
-machine pc-q35-4.0,usb=off,smm=on,dump-guest-core=off,memory-backend=pc.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,acpi=on \
-accel kvm \
-cpu qemu64 \

4
tests/qemuxmlconfdata/firmware-auto-efi-riscv64.riscv64-latest.abi-update.args
View File

@ -11,9 +11,9 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
-S \
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-guest/master-key.aes"}' \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/riscv/RISCV_VIRT_CODE.qcow2","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage","backing":null}' \
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/guest_VARS.qcow2","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage","backing":null}' \
-machine virt,usb=off,dump-guest-core=off,memory-backend=riscv_virt_board.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,acpi=off \
-accel tcg \
-cpu rv64 \

4
tests/qemuxmlconfdata/firmware-auto-efi.x86_64-latest.abi-update.args
View File

@ -11,9 +11,9 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-guest/.config \
-S \
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-guest/master-key.aes"}' \
-blockdev '{"driver":"file","filename":"/usr/share/edk2/ovmf/OVMF_CODE_4M.secboot.qcow2","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage"}' \
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"qcow2","file":"libvirt-pflash0-storage","backing":null}' \
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/guest_VARS.qcow2","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage"}' \
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"qcow2","file":"libvirt-pflash1-storage","backing":null}' \
-machine pc-q35-4.0,usb=off,smm=on,dump-guest-core=off,memory-backend=pc.ram,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,acpi=on \
-accel kvm \
-cpu qemu64 \