On 2016-09-17 19:55, Peter Grehan wrote: > Hi Trent, > >> If anyone has any hints on how to get more information from this or ideas >> on the apparent APIC error would be greatly appreciated. > > Thanks for the boot logs. The bhyve bug can be seen from: > > ACPI BIOS Warning (bug): Incorrect checksum in table [APIC] - 0x1C, > should be 0x0A (20160527/tbprint-229) > [7/1843] > MADT: Ignoring bogus I/O APIC ID 0MADT: Could not find APIC for SCI IRQ 9 > > .. which is pointing to the MADT table being overwritten. There is only > 256 bytes allocated for this table when it is being created: > > acpi.c > * MADT -> 0xf2500 (depends on #CPUs) > * FADT -> 0xf2600 (268 bytes) > ... > #define MADT_OFFSET 0x100 > #define FADT_OFFSET 0x200 > > The MADT* for bhyve has a 44-byte fixed header, followed by a array of > 8-byte 'Processor Local APIC' entries, one for each vCPU. The end of the > table has a 12-byte 'I/O APIC' entry, 2 10-byte 'Interrupt Source > Override' entries, and a 6-byte 'Local APIC NMI' entry. > > Looking at the max #CPUs that can fit into 256 bytes: > > 256 = 44 + N*8 + 12 + 2*10 + 6, which gives N = 21. The fact that it > worked for slightly larger values is probably due to the table entries > at the end being ignored, until eventually the I/O APIC table entry was > corrupted by the FADT overwrite. > > A quick fix to get more vCPUs is to bump the addresses of the tables in > acpi.c following the MADT - adding say 0x500 will give you 128 vCPUs. > > +#define FADT_OFFSET 0x700 > +#define HPET_OFFSET 0x840 > +#define MCFG_OFFSET 0x880 > +#define FACS_OFFSET 0x8C0 > +#define DSDT_OFFSET 0x900 > -#define FADT_OFFSET 0x200 > -#define HPET_OFFSET 0x340 > -#define MCFG_OFFSET 0x380 > -#define FACS_OFFSET 0x3C0 > -#define DSDT_OFFSET 0x400 > > I'll create a bug for this so that the overwrite will be detected at > run-time, and also bump up the space to allow for some growth. > > later, > > Peter. > > * see the ACPI spec at http://www.acpi.info/spec.htm for table details. > _______________________________________________ > firstname.lastname@example.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > To unsubscribe, send any mail to > "freebsd-virtualization-unsubscr...@freebsd.org"
Ha, so the only reason I didn't run into this, is the biggest VM i've created just happened to be 20 vCPUs on my 24 CPU system. Dodged a bullet, or, delay the discovery of this bug by 2 years. One of the two. -- Allan Jude
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