bdaf61259a
Update to v2.4.0 OBS-URL: https://build.opensuse.org/request/show/329598 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=271
65 lines
2.4 KiB
Diff
65 lines
2.4 KiB
Diff
From 8035717a00918d5c84c7c1fa326c6409431ece9e Mon Sep 17 00:00:00 2001
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From: Alexander Graf <agraf@suse.de>
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Date: Thu, 1 Apr 2010 17:36:23 +0200
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Subject: [PATCH] Make char muxer more robust wrt small FIFOs
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Virtio-Console can only process one character at a time. Using it on S390
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gave me strage "lags" where I got the character I pressed before when
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pressing one. So I typed in "abc" and only received "a", then pressed "d"
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but the guest received "b" and so on.
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While the stdio driver calls a poll function that just processes on its
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queue in case virtio-console can't take multiple characters at once, the
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muxer does not have such callbacks, so it can't empty its queue.
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To work around that limitation, I introduced a new timer that only gets
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active when the guest can not receive any more characters. In that case
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it polls again after a while to check if the guest is now receiving input.
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This patch fixes input when using -nographic on s390 for me.
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---
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qemu-char.c | 16 ++++++++++++++++
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1 file changed, 16 insertions(+)
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diff --git a/qemu-char.c b/qemu-char.c
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index d956f8d..cd301ba 100644
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--- a/qemu-char.c
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+++ b/qemu-char.c
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@@ -404,6 +404,9 @@ typedef struct {
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IOEventHandler *chr_event[MAX_MUX];
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void *ext_opaque[MAX_MUX];
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CharDriverState *drv;
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+#if defined(TARGET_S390X)
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+ QEMUTimer *accept_timer;
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+#endif
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int focus;
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int mux_cnt;
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int term_got_escape;
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@@ -563,6 +566,15 @@ static void mux_chr_accept_input(CharDriverState *chr)
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d->chr_read[m](d->ext_opaque[m],
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&d->buffer[m][d->cons[m]++ & MUX_BUFFER_MASK], 1);
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}
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+
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+#if defined(TARGET_S390X)
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+ /* We're still not able to sync producer and consumer, so let's wait a bit
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+ and try again by then. */
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+ if (d->prod[m] != d->cons[m]) {
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+ qemu_mod_timer(d->accept_timer, qemu_get_clock_ns(vm_clock)
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+ + (int64_t)100000);
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+ }
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+#endif
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}
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static int mux_chr_can_read(void *opaque)
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@@ -691,6 +703,10 @@ static CharDriverState *qemu_chr_open_mux(CharDriverState *drv)
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chr->opaque = d;
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d->drv = drv;
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d->focus = -1;
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+#if defined(TARGET_S390X)
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+ d->accept_timer = qemu_new_timer_ns(vm_clock,
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+ (QEMUTimerCB*)mux_chr_accept_input, chr);
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+#endif
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chr->chr_write = mux_chr_write;
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chr->chr_update_read_handler = mux_chr_update_read_handler;
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chr->chr_accept_input = mux_chr_accept_input;
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