f099b2fad1
Fix build issues for some older distros. Also includes fixing broken parts of spec file when not building x86 firmware. OBS-URL: https://build.opensuse.org/request/show/493037 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=338
72 lines
2.5 KiB
Diff
72 lines
2.5 KiB
Diff
From dafee8907bcaa3ee580ebef4f76e7d62c14cd5c3 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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[AF: Rebased for v2.7.0-rc2]
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---
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chardev/char-mux.c | 13 +++++++++++++
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chardev/char-mux.h | 3 +++
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2 files changed, 16 insertions(+)
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diff --git a/chardev/char-mux.c b/chardev/char-mux.c
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index 5547a36a0a..7b80dc8ad7 100644
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--- a/chardev/char-mux.c
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+++ b/chardev/char-mux.c
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@@ -179,6 +179,15 @@ static void mux_chr_accept_input(Chardev *chr)
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be->chr_read(be->opaque,
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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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@@ -308,6 +317,10 @@ static void qemu_chr_open_mux(Chardev *chr,
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}
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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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/* only default to opened state if we've realized the initial
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* set of muxes
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*/
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diff --git a/chardev/char-mux.h b/chardev/char-mux.h
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index 9a2fffce91..d5f419c8a9 100644
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--- a/chardev/char-mux.h
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+++ b/chardev/char-mux.h
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@@ -35,6 +35,9 @@ typedef struct MuxChardev {
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Chardev parent;
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CharBackend *backends[MAX_MUX];
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CharBackend chr;
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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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