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Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows
From: |
Peter Maydell |
Subject: |
Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1 |
Date: |
Thu, 1 Feb 2024 18:04:26 +0000 |
On Thu, 1 Feb 2024 at 17:25, Alex Bennée <alex.bennee@linaro.org> wrote:
>
> Jonathan Cameron <Jonathan.Cameron@Huawei.com> writes:
> >> > #21 0x0000555555ca3e5d in do_st8_mmu (cpu=0x5555578e0cb0, addr=23937,
> >> > val=18386491784638059520, oi=6, ra=140736029817822) at
> >> > ../../accel/tcg/cputlb.c:2853
> >> > #22 0x00007fffa9107c63 in code_gen_buffer ()
> >>
> >> No thats different - we are actually writing to the MMIO region here.
> >> But the fact we hit cpu_abort because we can't find the TB we are
> >> executing is a little problematic.
> >>
> >> Does ra properly point to the code buffer here?
> >
> > Err. How would I tell?
>
> (gdb) p/x 140736029817822
> $1 = 0x7fffa9107bde
>
> seems off because code_gen_buffer starts at 0x00007fffa9107c63
The code_gen_buffer doesn't *start* at 0x00007fffa9107c63 --
that is our return address into it, which is to say it's just
after the call insn to the do_st8_mmu helper. The 'ra' argument
to the helper function is going to be a number slightly lower
than that, because it points within the main lump of generated
code for the TB, whereas the helper call is done as part of
an out-of-line lump of common code at the end of the TB.
The 'ra' here is fine -- the problem is that we don't
pass it all the way down the callstack and instead end
up using 0 as a 'ra' within the ptw code.
-- PMM
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, (continued)
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Peter Maydell, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Alex Bennée, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Jonathan Cameron, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Peter Maydell, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Jonathan Cameron, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Alex Bennée, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Jonathan Cameron, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Peter Maydell, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Jonathan Cameron, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Alex Bennée, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1,
Peter Maydell <=
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Gregory Price, 2024/02/01
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Jonathan Cameron, 2024/02/02
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Peter Maydell, 2024/02/02
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Gregory Price, 2024/02/02
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Peter Maydell, 2024/02/02
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Jonathan Cameron, 2024/02/07
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Jonathan Cameron, 2024/02/08
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Jonathan Cameron, 2024/02/15
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Mattias Nissler, 2024/02/19
- Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1, Gregory Price, 2024/02/01