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authorChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
committerChristian Krinitsin <mail@krinitsin.com>2025-07-03 07:27:52 +0000
commitd0c85e36e4de67af628d54e9ab577cc3fad7796a (patch)
treef8f784b0f04343b90516a338d6df81df3a85dfa2 /results/classifier/gemma3:12b/kvm/732155
parent7f4364274750eb8cb39a3e7493132fca1c01232e (diff)
downloadqemu-analysis-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz
qemu-analysis-d0c85e36e4de67af628d54e9ab577cc3fad7796a.zip
add deepseek and gemma results
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+
+system_reset doesn't work with qemu-kvm and latest SeaBIOS
+
+I've built qemu-kvm and seabios from the latest git sources, and found that the system_reset monitor command causes a freeze if I start qemu-system-x86_64 with the -no-kvm flag.  This is a serial log from an attempt at rebooting:
+
+$ ./x86_64-softmmu/qemu-system-x86_64 -monitor stdio -bios ../seabios/out/bios.bin -serial /dev/stdout -no-kvm
+QEMU 0.14.50 monitor - type 'help' for more information
+(qemu) Changing serial settings was 0/0 now 3/0
+Start bios (version pre-0.6.3-20110309_171929-desk4)
+Ram Size=0x08000000 (0x0000000000000000 high)
+CPU Mhz=2202
+PCI: pci_bios_init_bus_rec bus = 0x0
+PIIX3/PIIX4 init: elcr=00 0c
+PCI: bus=0 devfn=0x00: vendor_id=0x8086 device_id=0x1237
+PCI: bus=0 devfn=0x08: vendor_id=0x8086 device_id=0x7000
+PCI: bus=0 devfn=0x09: vendor_id=0x8086 device_id=0x7010
+region 4: 0x0000c000
+PCI: bus=0 devfn=0x0b: vendor_id=0x8086 device_id=0x7113
+PCI: bus=0 devfn=0x10: vendor_id=0x1013 device_id=0x00b8
+region 0: 0xf0000000
+region 1: 0xf2000000
+region 6: 0xf2010000
+PCI: bus=0 devfn=0x18: vendor_id=0x10ec device_id=0x8139
+region 0: 0x0000c100
+region 1: 0xf2020000
+region 6: 0xf2030000
+Found 1 cpu(s) max supported 1 cpu(s)
+MP table addr=0x000fdb40 MPC table addr=0x000fdb50 size=224
+SMBIOS ptr=0x000fdb20 table=0x07fffef0
+ACPI tables: RSDP=0x000fdaf0 RSDT=0x07ffd6a0
+Scan for VGA option rom
+Running option rom at c000:0003
+Turning on vga text mode console
+SeaBIOS (version pre-0.6.3-20110309_171929-desk4)
+
+PS2 keyboard initialized
+Found 1 lpt ports
+Found 1 serial ports
+ATA controller 0 at 1f0/3f4/0 (irq 14 dev 9)
+ATA controller 1 at 170/374/0 (irq 15 dev 9)
+DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD]
+Searching bootorder for: /pci@i0cf8/*@1,1/drive@1/disk@0
+Scan for option roms
+Running option rom at c900:0003
+pnp call arg1=60
+pmm call arg1=0
+pmm call arg1=2
+pmm call arg1=0
+Searching bootorder for: /pci@i0cf8/*@3
+Searching bootorder for: /rom@genroms/vapic.bin
+Running option rom at c980:0003
+ebda moved from 9fc00 to 9f400
+Returned 53248 bytes of ZoneHigh
+e820 map has 6 items:
+  0: 0000000000000000 - 000000000009f400 = 1
+  1: 000000000009f400 - 00000000000a0000 = 2
+  2: 00000000000f0000 - 0000000000100000 = 2
+  3: 0000000000100000 - 0000000007ffd000 = 1
+  4: 0000000007ffd000 - 0000000008000000 = 2
+  5: 00000000fffc0000 - 0000000100000000 = 2
+enter handle_19:
+  NULL
+Booting from DVD/CD...
+Device reports MEDIUM NOT PRESENT
+atapi_is_ready returned -1
+Boot failed: Could not read from CDROM (code 0003)
+enter handle_18:
+  NULL
+Booting from ROM...
+Booting from c900:0336
+
+(qemu) 
+(qemu) system_reset
+(qemu) RESET REQUESTEDChanging serial settings was 0/0 now 3/0
+Start bios (version pre-0.6.3-20110309_171929-desk4)
+Attempting a hard reboot
+prep_reset
+apm_shutdown?
+i8042_reboot
+i8042: wait to write...
+i8042: outb
+RESET REQUESTED
+(qemu) 
+(qemu) 
+(qemu) 
+(qemu) info cpus
+* CPU #0: pc=0x00000000fffffff0 thread_id=18125 
+(qemu) system_reset
+(qemu) RESET REQUESTED
+(qemu) 
+(qemu) q
+
+I've tried fiddling a few build options in SeaBIOS but I'm not sure that's where the issue lies.  The RESET REQUESTED is me adding some extra debug to vl.c:1477 in the clause that tests for a reset request, and the i8042: lines are debug lines from seabios tracing the execution of the reset request.
+
+This may be a bug in SeaBIOS of course, since I can replicate the behaviour on my distro's qemu and kvm packages.  However it seems odd that qemu behaves differently with KVM turned on (i.e. system_reset works) than with it disabled.
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