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From 41f2bce1d8d55b1a35bd7456b4b13b5bc098745f Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Tue, 10 Jul 2018 23:06:15 +0200
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Subject: [PATCH 32/89] ahci: fix PxCI register race
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20180710230616.11000-3-jsnow@redhat.com>
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Patchwork-id: 81293
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 2/3] ahci: fix PxCI register race
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Bugzilla: 1584914
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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Fixes: https://bugs.launchpad.net/qemu/+bug/1769189
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AHCI presently signals completion prior to the PxCI register being
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cleared to indicate completion. If a guest driver attempts to issue
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a new command in its IRQ handler, it might be surprised to learn there
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is still a command pending.
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In the case of Windows 10's boot driver, it will actually poll the IRQ
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register hoping to find out when the command is done running -- which
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will never happen, as there isn't a command running.
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Fix this: clear PxCI in ahci_cmd_done and not in the asynchronous BH.
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Because it now runs synchronously, we don't need to check if the command
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is actually done by spying on the ATA registers. We know it's done.
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CC: qemu-stable <qemu-stable@nongnu.org>
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Reported-by: François Guerraz <kubrick@fgv6.net>
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Tested-by: Bruce Rogers <brogers@suse.com>
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Signed-off-by: John Snow <jsnow@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Jeff Cody <jcody@redhat.com>
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Message-id: 20180531004323.4611-3-jsnow@redhat.com
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Signed-off-by: John Snow <jsnow@redhat.com>
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(cherry picked from commit 5694c7eacce6b263ad7497cc1bb76aad746cfd4e)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/ide/ahci.c | 13 ++++++-------
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1 file changed, 6 insertions(+), 7 deletions(-)
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diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
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index b7a6f68..a9558e4 100644
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--- a/hw/ide/ahci.c
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+++ b/hw/ide/ahci.c
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@@ -532,13 +532,6 @@ static void ahci_check_cmd_bh(void *opaque)
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qemu_bh_delete(ad->check_bh);
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ad->check_bh = NULL;
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- if ((ad->busy_slot != -1) &&
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- !(ad->port.ifs[0].status & (BUSY_STAT|DRQ_STAT))) {
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- /* no longer busy */
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- ad->port_regs.cmd_issue &= ~(1 << ad->busy_slot);
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- ad->busy_slot = -1;
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- }
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-
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check_cmd(ad->hba, ad->port_no);
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}
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@@ -1425,6 +1418,12 @@ static void ahci_cmd_done(IDEDMA *dma)
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trace_ahci_cmd_done(ad->hba, ad->port_no);
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+ /* no longer busy */
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+ if (ad->busy_slot != -1) {
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+ ad->port_regs.cmd_issue &= ~(1 << ad->busy_slot);
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+ ad->busy_slot = -1;
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+ }
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+
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/* update d2h status */
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ahci_write_fis_d2h(ad);
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--
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1.8.3.1
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