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Write recognized CPUID flags into static file

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located at /usr/share/kvm/recognized-CPUID-flags-x86_64

It's a simple one flag per line list of all flags the build of QEMU
can understand for x86_64 CPUs.

It will be used in qemu-server for the custom CPU model feature.

For now, only x86_64 is implemented, since aarch64 doesn't print any flags when
called this way.

Co-developed-by: Stefan Reiter <s.reiter@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Thomas Lamprecht 2019-10-17 13:37:02 +02:00
parent b8e0d5bc0f
commit 376d9ce806
2 changed files with 28 additions and 0 deletions
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23
debian/parse-cpu-flags.pl vendored Executable file
View File

@ -0,0 +1,23 @@
#!/usr/bin/perl
use warnings;
use strict;
my @flags = ();
my $got_flags_section;
while (<STDIN>) {
if (/^\s*Recognized CPUID flags:/) {
$got_flags_section = 1;
next;
}
next if !$got_flags_section;
s/^\s+//;
push @flags, split(/\s+/);
}
die "no QEMU/KVM CPU flags detected from STDIN input" if scalar (@flags) <= 0;
print join("\n", @flags) or die "$!\n";

5
debian/rules vendored
View File

@ -21,6 +21,8 @@ ARCH ?= $(shell dpkg-architecture -qDEB_HOST_GNU_CPU)
PACKAGE=pve-qemu-kvm
destdir := $(CURDIR)/debian/$(PACKAGE)
flagfile := $(destdir)/usr/share/kvm/recognized-CPUID-flags-x86_64
CFLAGS = -Wall
ifneq (,$(findstring noopt,$(DEB_BUILD_OPTIONS)))
@ -128,6 +130,9 @@ install: build
rm -Rf $(destdir)/usr/include
rm -Rf $(destdir)/usr/lib*
# CPU flags are static for QEMU version, allows avoiding more costly checks
$(destdir)/usr/bin/qemu-system-x86_64 -cpu help | ./debian/parse-cpu-flags.pl > $(flagfile)
# Build architecture-independent files here.
binary-indep: build install
# We have nothing to do by default.