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* [Qemu-devel] [Bug 1759333] [NEW] Illegal Instruction with HVF when encountering SSE instructions in the emulator
@ 2018-03-27 17:00 Fa Bi
  2018-10-24 12:34 ` [Qemu-devel] [Bug 1759333] " Alex Bennée
                   ` (5 more replies)
  0 siblings, 6 replies; 7+ messages in thread
From: Fa Bi @ 2018-03-27 17:00 UTC (permalink / raw)
  To: qemu-devel

Public bug reported:

The latest version of QEMU doesn't seem to support emulated SSE instructions with HVF acceleration on macOS.
The decoder will treat SSE instructions as invalid, get the instruction sizes wrong and quickly crash the guest OS because of illegal instructions.
After having a quick look at target/i386/hvf/x86_decode.c, it seems that SSE instruction emulation isn't implemented in the current version of the x86 emulator.

A way to reproduce the issue is to run a macOS 10.13 guest with HVF
acceleration enabled, this will crash in the guest once it's loading up
the GUI (and also print a "Unimplemented handler" warning from
target/i386/hvf/x86_emu.c).

** Affects: qemu
     Importance: Undecided
         Status: New

** Summary changed:

- Illegal Instruction with HVF when encountering SSE instructions in Privileged Mode
+ Illegal Instruction with HVF when encountering SSE instructions in the emulator

** Description changed:

  The latest version of QEMU doesn't seem to support emulated SSE instructions with HVF acceleration on macOS.
  The decoder will treat SSE instructions as invalid, get the instruction sizes wrong and quickly crash the guest OS because of illegal instructions.
  After having a quick look at target/i386/hvf/x86_decode.c, it seems that SSE instruction emulation isn't implemented in the current version of the x86 emulator.
  
  A way to reproduce the issue is to run a macOS 10.13 guest with HVF
- acceleration enabled, this will crash once it's loading up the GUI.
+ acceleration enabled, this will crash in the guest once it's loading up
+ the GUI (and also print a "Unimplemented handler" warning from
+ target/i386/hvf/x86_emu.c).

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1759333

Title:
  Illegal Instruction with HVF when encountering SSE instructions in the
  emulator

Status in QEMU:
  New

Bug description:
  The latest version of QEMU doesn't seem to support emulated SSE instructions with HVF acceleration on macOS.
  The decoder will treat SSE instructions as invalid, get the instruction sizes wrong and quickly crash the guest OS because of illegal instructions.
  After having a quick look at target/i386/hvf/x86_decode.c, it seems that SSE instruction emulation isn't implemented in the current version of the x86 emulator.

  A way to reproduce the issue is to run a macOS 10.13 guest with HVF
  acceleration enabled, this will crash in the guest once it's loading
  up the GUI (and also print a "Unimplemented handler" warning from
  target/i386/hvf/x86_emu.c).

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1759333/+subscriptions

^ permalink raw reply	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2021-05-05  8:30 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-03-27 17:00 [Qemu-devel] [Bug 1759333] [NEW] Illegal Instruction with HVF when encountering SSE instructions in the emulator Fa Bi
2018-10-24 12:34 ` [Qemu-devel] [Bug 1759333] " Alex Bennée
2018-10-25 13:06 ` Richard Henderson
2020-11-13 16:10 ` Thomas Huth
2020-11-16 10:58 ` Roman Bolshakov
2020-11-16 18:14 ` Thomas Huth
2021-05-05  8:19 ` Thomas Huth

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