peter/qemu - QEMU hacking for Peter

Age	Commit message (Collapse)	Author	Files	Lines
2016-10-06	test-qht: perform lookups under rcu_read_lock	Emilio G. Cota	1	-0/+4
	qht_lookup is meant to be called from an RCU read-critical section. Make sure we're in such a section in test-qht when performing lookups, despite the fact that no races in qht can be triggered by test-qht since it is single-threaded. Note that rcu_register_thread is already called by the rcu_after_fork hook, and therefore duplicating it here would be a bug. Signed-off-by: Emilio G. Cota <cota@braap.org> Message-Id: <1475706880-10667-4-git-send-email-cota@braap.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-08-02	qht: do not segfault when gathering stats from an uninitialized qht	Emilio G. Cota	1	-0/+4
	So far, QHT functions assume that the passed qht has previously been initialized--otherwise they segfault. This patch makes an exception for qht_statistics_init, with the goal of simplifying calling code. For instance, qht_statistics_init is called from the 'info jit' dump, and given that under KVM the TB qht is never initialized, we get a segfault. Thus, instead of complicating the 'info jit' code with additional checks, let's allow passing an uninitialized qht to qht_statistics_init. While at it, add a test for this to test-qht. Before the patch (for $ qemu -enable-kvm [...]): (qemu) info jit [...] direct jump count 0 (0%) (2 jumps=0 0%) Program received signal SIGSEGV, Segmentation fault. After the patch the "TB hash buckets", "TB hash occupancy" and "TB hash avg chain" lines are omitted. (qemu) info jit [...] direct jump count 0 (0%) (2 jumps=0 0%) TB hash buckets 0/0 (-nan% head buckets used) TB hash occupancy nan% avg chain occ. Histogram: (null) TB hash avg chain nan buckets. Histogram: (null) [...] Reported by: Changlong Xie <xiecl.fnst@cn.fujitsu.com> Signed-off-by: Emilio G. Cota <cota@braap.org> Message-Id: <1469205390-14369-1-git-send-email-cota@braap.org> [Extract printing statistics to an entirely separate function. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-06-16	clean-includes: run it once more	Paolo Bonzini	1	-1/+0
	Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-06-11	qht: add test program	Emilio G. Cota	1	-0/+159
	Acked-by: Sergey Fedorov <sergey.fedorov@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Emilio G. Cota <cota@braap.org> Message-Id: <1465412133-3029-12-git-send-email-cota@braap.org> Signed-off-by: Richard Henderson <rth@twiddle.net>