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1d7e6318af
The DPDES support for doorbell emulation and handling for KVM on PAPR
guests was added in Linux via [1]. Subsequently, a new GSB (Guest State
Buffer) element for DPDES was added in Linux; the same has been missing
in TCG L0 implementation. Add support for DPDES register's APIv2 GSB
element and required handling in `spapr_nested.c`.
Currently, booting a KVM guest inside a QEMU TCG guest fails with the
following crash. The crash occurs while handling the GUEST_RUN_VCPU
hcall made in TCG L0. In the hcall handling path, map_and_getset_state()
calls getset_state(), which, in turn, calls guest_state_request_check()
to validate the GSR (Guest State Request) elements. During this process,
guest_state_request_check() iterates over the GSR elements and receives
a NULL return code from guest_state_element_type_find() for the type
variable corresponding to the DPDES register's elemetn ID (which was
unknown to TCG L0). Subsequently, getset_state() returns H_P3,
ultimately leading to the hcall failure and causing the KVM guest to
crash.
KVM: unknown exit, hardware reason ffffffffffffffea
[ ... KVM register dump ... ]
Fix this by adding the required support in TCG L0 implementation of
APIv2.
[1] https://lore.kernel.org/all/20240605113913.83715-1-gautam@linux.ibm.com/
Fixes:
|
||
|---|---|---|
| .. | ||
| fdt.h | ||
| mac_dbdma.h | ||
| openpic.h | ||
| openpic_kvm.h | ||
| pnv.h | ||
| pnv_adu.h | ||
| pnv_chip.h | ||
| pnv_chiptod.h | ||
| pnv_core.h | ||
| pnv_homer.h | ||
| pnv_i2c.h | ||
| pnv_lpc.h | ||
| pnv_n1_chiplet.h | ||
| pnv_nest_pervasive.h | ||
| pnv_occ.h | ||
| pnv_pnor.h | ||
| pnv_psi.h | ||
| pnv_sbe.h | ||
| pnv_xive.h | ||
| pnv_xscom.h | ||
| ppc.h | ||
| ppc4xx.h | ||
| ppc_e500.h | ||
| spapr.h | ||
| spapr_cpu_core.h | ||
| spapr_drc.h | ||
| spapr_irq.h | ||
| spapr_nested.h | ||
| spapr_numa.h | ||
| spapr_nvdimm.h | ||
| spapr_ovec.h | ||
| spapr_tpm_proxy.h | ||
| spapr_vio.h | ||
| spapr_xive.h | ||
| vof.h | ||
| xics.h | ||
| xics_spapr.h | ||
| xive.h | ||
| xive2.h | ||
| xive2_regs.h | ||
| xive_regs.h | ||