8c721a87ae
- Remove deprecated patch "work-around-SA_RESTART-race" (boo#982208) - Patch queue updated from git://github.com/openSUSE/qemu.git opensuse-2.6 * Patches dropped: 0002-XXX-work-around-SA_RESTART-race-wit.patch 0003-qemu-0.9.0.cvs-binfmt.patch 0004-qemu-cvs-alsa_bitfield.patch 0005-qemu-cvs-alsa_ioctl.patch 0006-qemu-cvs-alsa_mmap.patch 0007-qemu-cvs-gettimeofday.patch 0008-qemu-cvs-ioctl_debug.patch 0009-qemu-cvs-ioctl_nodirection.patch 0010-block-vmdk-Support-creation-of-SCSI.patch 0011-linux-user-add-binfmt-wrapper-for-a.patch 0012-PPC-KVM-Disable-mmu-notifier-check.patch 0013-linux-user-fix-segfault-deadlock.patch 0014-linux-user-binfmt-support-host-bina.patch 0015-linux-user-Ignore-broken-loop-ioctl.patch 0016-linux-user-lock-tcg.patch 0017-linux-user-Run-multi-threaded-code-.patch 0018-linux-user-lock-tb-flushing-too.patch 0019-linux-user-Fake-proc-cpuinfo.patch 0020-linux-user-implement-FS_IOC_GETFLAG.patch 0021-linux-user-implement-FS_IOC_SETFLAG.patch 0022-linux-user-XXX-disable-fiemap.patch 0023-slirp-nooutgoing.patch 0024-vnc-password-file-and-incoming-conn.patch 0025-linux-user-add-more-blk-ioctls.patch 0026-linux-user-use-target_ulong.patch 0027-block-Add-support-for-DictZip-enabl.patch 0028-block-Add-tar-container-format.patch OBS-URL: https://build.opensuse.org/request/show/408549 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=305
65 lines
2.4 KiB
Diff
65 lines
2.4 KiB
Diff
From 5b001dfb49c85d9934f0ac09bd24a7aecac55956 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 b597ee1..eedae4f 100644
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--- a/qemu-char.c
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+++ b/qemu-char.c
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@@ -512,6 +512,9 @@ 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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@@ -671,6 +674,15 @@ 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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@@ -812,6 +824,10 @@ static CharDriverState *qemu_chr_open_mux(const char *id,
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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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