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[06/10] docs/emulation: expand warning about semihosting

Message ID 20231115205542.3092038-7-alex.bennee@linaro.org
State Superseded
Headers show
Series random fixes for 8.2 (tests, plugins, docs, semihosting) | expand

Commit Message

Alex Bennée Nov. 15, 2023, 8:55 p.m. UTC 
A surprising feature of calls like SYS_READC is this can cause QEMU to
indefinitely block as there is no handling for EOF.

Clarifies: https://gitlab.com/qemu-project/qemu/-/issues/1963
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 docs/about/emulation.rst | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/docs/about/emulation.rst b/docs/about/emulation.rst
index 0ad0b86f0d..a2eefe3f3f 100644
--- a/docs/about/emulation.rst
+++ b/docs/about/emulation.rst
@@ -129,8 +129,9 @@  causing most hypervisors to trap and fault on them.
 .. warning::
    Semihosting inherently bypasses any isolation there may be between
    the guest and the host. As a result a program using semihosting can
-   happily trash your host system. You should only ever run trusted
-   code with semihosting enabled.
+   happily trash your host system. Some semihosting calls (e.g.
+   ``SYS_READC``) can block execution indefinitely. You should only
+   ever run trusted code with semihosting enabled.
 
 Redirection
 ~~~~~~~~~~~