mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

icount: don't adjust virtual time backwards after warp

Browse Source 
The icount-based QEMU_CLOCK_VIRTUAL runs ahead of the RT clock at times.
When warping, it is possible it is still ahead at the end of the warp,
which causes icount adaptive mode to adjust it backward. This can result
in the machine observing time going backwards.

Prevent this by clamping adaptive adjustment to 0 at minimum.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20230627061406.241847-1-npiggin@gmail.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nicholas Piggin 2023-06-27 16:14:06 +10:00 committed by Paolo Bonzini
parent 4329d049d5
commit 67f85346ca
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
softmmu/icount.c
View File

@ -259,11 +259,16 @@ static void icount_warp_rt(void)
warp_delta = clock - timers_state.vm_clock_warp_start;
if (icount_enabled() == 2) {
/*
* In adaptive mode, do not let QEMU_CLOCK_VIRTUAL run too
* far ahead of real time.
* In adaptive mode, do not let QEMU_CLOCK_VIRTUAL run too far
* ahead of real time (it might already be ahead so careful not
* to go backwards).
*/
int64_t cur_icount = icount_get_locked();
int64_t delta = clock - cur_icount;
if (delta < 0) {
delta = 0;
}
warp_delta = MIN(warp_delta, delta);
}
qatomic_set_i64(&timers_state.qemu_icount_bias,