From c107521e0ee9ea1744f674a79d02d3d5ea2ba98c Mon Sep 17 00:00:00 2001 From: Ilya Leoshkevich Date: Wed, 30 Oct 2024 00:17:47 +0100 Subject: linux-user: Allow custom rt signal mappings Some applications want to use low priority realtime signals (e.g., SIGRTMAX). Currently QEMU cannot map all target realtime signals to host realtime signals, and chooses to sacrifice the end of the target realtime signal range. Allow users to choose how to map target realtime signals to host realtime signals using the new -t option, the new QEMU_RTSIG_MAP environment variable, and the new -Drtsig_map=\"...\" meson flag. To simplify things, the meson flag is not per-target, because the intended use case is app-specific qemu-user builds. The mapping is specified using the "tsig hsig count[,...]" syntax. Target realtime signals [tsig,tsig+count) are mapped to host realtime signals [hsig,hsig+count). Care is taken to avoid double and out-of-range mappings. Signed-off-by: Ilya Leoshkevich Reviewed-by: Richard Henderson Message-ID: <20241029232211.206766-2-iii@linux.ibm.com> Signed-off-by: Richard Henderson --- scripts/meson-buildoptions.sh | 2 ++ 1 file changed, 2 insertions(+) (limited to 'scripts') diff --git a/scripts/meson-buildoptions.sh b/scripts/meson-buildoptions.sh index 6f2bb08..51ed46e 100644 --- a/scripts/meson-buildoptions.sh +++ b/scripts/meson-buildoptions.sh @@ -72,6 +72,7 @@ meson_options_help() { printf "%s\n" ' "manufacturer" name for qemu-ga registry entries' printf "%s\n" ' [QEMU]' printf "%s\n" ' --qemu-ga-version=VALUE version number for qemu-ga installer' + printf "%s\n" ' --rtsig-map=VALUE default value of QEMU_RTSIG_MAP [NULL]' printf "%s\n" ' --smbd=VALUE Path to smbd for slirp networking' printf "%s\n" ' --sysconfdir=VALUE Sysconf data directory [etc]' printf "%s\n" ' --tls-priority=VALUE Default TLS protocol/cipher priority string' @@ -460,6 +461,7 @@ _meson_option_parse() { --disable-replication) printf "%s" -Dreplication=disabled ;; --enable-rng-none) printf "%s" -Drng_none=true ;; --disable-rng-none) printf "%s" -Drng_none=false ;; + --rtsig-map=*) quote_sh "-Drtsig_map=$2" ;; --enable-rust) printf "%s" -Drust=enabled ;; --disable-rust) printf "%s" -Drust=disabled ;; --enable-rutabaga-gfx) printf "%s" -Drutabaga_gfx=enabled ;; -- cgit v1.1