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esp: Handle CMD_BUSRESET by resetting the SCSI bus

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Per investigation on the linked ticket, SunOS issues a SCSI bus reset
to the ESP as part of its boot sequence. If this ESP command doesn't
cause devices to assert sense flag UNIT ATTENTION, SunOS will consider
the CD-ROM device to be non-compliant with Common Command Set (CCS).
In this condition, the SunOS installer's early userspace doesn't set
the installation source location to sr0 and the miniroot copy fails.

Signed-off-by: John Millikin <john@john-millikin.com>
Suggested-by: Bill Paul <noisetube@gmail.com>
Buglink: https://gitlab.com/qemu-project/qemu/-/issues/1127
Message-Id: <20220817053846.699310-1-john@john-millikin.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
John Millikin 2022-08-17 14:38:47 +09:00 committed by Paolo Bonzini
parent e93ded1bf6
commit c6e51f1bb2
1 changed files with 6 additions and 0 deletions
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6
hw/scsi/esp.c
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@ -939,6 +939,11 @@ static void esp_soft_reset(ESPState *s)
esp_hard_reset(s);
}
static void esp_bus_reset(ESPState *s)
{
qbus_reset_all(BUS(&s->bus));
}
static void parent_esp_reset(ESPState *s, int irq, int level)
{
if (level) {
@ -1067,6 +1072,7 @@ void esp_reg_write(ESPState *s, uint32_t saddr, uint64_t val)
break;
case CMD_BUSRESET:
trace_esp_mem_writeb_cmd_bus_reset(val);
esp_bus_reset(s);
if (!(s->wregs[ESP_CFG1] & CFG1_RESREPT)) {
s->rregs[ESP_RINTR] |= INTR_RST;
esp_raise_irq(s);