On 09/08/2017 06:35, Pedro Fonseca wrote: > Hi, > > We've been running tests on KVM and found a couple of situations that > cause KVM to hang under SVM. The host was running on "AMD Ryzen 7 1700 > Eight-Core Processor" and Linux 4.12.5. The tests ran with a small > synthetic VM. Do you have a C program or something like that? > Here's the initial register values that cause KVM to hang: >> CS-Attr: c09b >> CS-Base: 0 >> CS: f000 >> DS: 0 >> DS-Attr: c093 >> DS-Base: 0 >> GDT-Base: 000000000000f000 >> GDT-Limit: 00000027 So the GDT points to zero memory? 0x1000 in the dump below looks like a GDT. Paolo >> IDT-Base: 0000000000000000 >> IDT-Limit: 0000ffff >> RFLAGS: 2 >> RIP: 0 >> RSP: 0 > Note that sregs not displayed are initialized with values from > KVM_GET_SREGS. > > And here's the non-null memory contents: >> 00000000: 66c7 0425 0000 0400 2301 b821 0000 00f4 f..%....#..!.... >> 00001000: 0000 0000 0000 0000 ffff 0000 009b c000 ................ >> 00001010: ffff 0000 0093 c000 0000 0000 009b c000 ................ >> 00001020: ffff 0000 009b 8000 0000 0000 0000 0000 ................ >> 00002000: 8700 0000 8700 4000 0000 0000 0000 0000 ......@......... > > The ftrace is available here: > https://pastebin.com/234aqXjs > > Thanks, > Pedro > >
