Re: [Crash-utility] [PATCH v2 1/3] vmware_vmss: get proper ITDR

diff --git a/vmware_vmss.c b/vmware_vmss.c index b168f29..8aa0de0 100644 --- a/vmware_vmss.c +++ b/vmware_vmss.c @@ -881,6 +881,27 @@ vmware_vmss_get_cr3_idtr(ulong *cr3, ulong *idtr) *cr3 = vmss.regs64[0]->cr[3]; *idtr = vmss.regs64[0]->idtr; + /* + * debug.guest is generated on guest triple fault. One of the possible + * ways to triple fault is: zeroing IDTR and int3. + * This is used in linux to reboot machine using triple fault: + * "reboot=t" cmdline. + * In that case CPU which triggered triple fault will have zeroed + * IDTR. IDTR and CR3 are used to calculate kaslr offset and phys + * base. + * If IDTR on CPU0 is zeroed and we have several CPUs, return IDTR from + * another CPU. + */ + if (vmss.num_vcpus > 1 && *idtr == 0) { + int i; + for (i = 0; i < vmss.num_vcpus; i++) { + if (vmss.vcpu_regs[i] == REGS_PRESENT_ALL) { + *idtr = vmss.regs64[i]->idtr; + break; + } + } + } + return TRUE; }