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Tsirkin" To: BALATON Zoltan Cc: Mark Cave-Ayland , qemu-devel@nongnu.org, Igor Mammedov , Paolo Bonzini Subject: Re: [PATCH v2] hw/acpi: Fix PM control register access Message-ID: <20230620092639-mutt-send-email-mst@kernel.org> References: <20230607200125.A9988746377@zero.eik.bme.hu> <20230608111241-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=170.10.129.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, Jun 08, 2023 at 05:20:37PM +0200, BALATON Zoltan wrote: > On Thu, 8 Jun 2023, Michael S. Tsirkin wrote: > > On Thu, Jun 08, 2023 at 12:37:08PM +0100, Mark Cave-Ayland wrote: > > > On 07/06/2023 21:01, BALATON Zoltan wrote: > > > > > > > On pegasos2 which has ACPI as part of VT8231 south bridge the board > > > > firmware writes PM control register by accessing the second byte so > > > > addr will be 1. This wasn't handled correctly and the write went to > > > > addr 0 instead. Remove the acpi_pm1_cnt_write() function which is used > > > > only once and does not take addr into account and handle non-zero > > > > address in acpi_pm_cnt_{read|write}. This fixes ACPI shutdown with > > > > pegasos2 firmware. > > > > > > > > Signed-off-by: BALATON Zoltan > > > > --- > > > > hw/acpi/core.c | 52 +++++++++++++++++++++++++------------------------- > > > > 1 file changed, 26 insertions(+), 26 deletions(-) > > > > > > > > diff --git a/hw/acpi/core.c b/hw/acpi/core.c > > > > index 6da275c599..00b1e79a30 100644 > > > > --- a/hw/acpi/core.c > > > > +++ b/hw/acpi/core.c > > > > @@ -551,30 +551,6 @@ void acpi_pm_tmr_reset(ACPIREGS *ar) > > > > } > > > > /* ACPI PM1aCNT */ > > > > -static void acpi_pm1_cnt_write(ACPIREGS *ar, uint16_t val) > > > > -{ > > > > - ar->pm1.cnt.cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE); > > > > - > > > > - if (val & ACPI_BITMASK_SLEEP_ENABLE) { > > > > - /* change suspend type */ > > > > - uint16_t sus_typ = (val >> 10) & 7; > > > > - switch (sus_typ) { > > > > - case 0: /* soft power off */ > > > > - qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); > > > > - break; > > > > - case 1: > > > > - qemu_system_suspend_request(); > > > > - break; > > > > - default: > > > > - if (sus_typ == ar->pm1.cnt.s4_val) { /* S4 request */ > > > > - qapi_event_send_suspend_disk(); > > > > - qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); > > > > - } > > > > - break; > > > > - } > > > > - } > > > > -} > > > > - > > > > void acpi_pm1_cnt_update(ACPIREGS *ar, > > > > bool sci_enable, bool sci_disable) > > > > { > > > > @@ -593,13 +569,37 @@ void acpi_pm1_cnt_update(ACPIREGS *ar, > > > > static uint64_t acpi_pm_cnt_read(void *opaque, hwaddr addr, unsigned width) > > > > { > > > > ACPIREGS *ar = opaque; > > > > - return ar->pm1.cnt.cnt; > > > > + return ar->pm1.cnt.cnt >> addr * 8; > > > > > > This shift here... > > > > > > > } > > > > static void acpi_pm_cnt_write(void *opaque, hwaddr addr, uint64_t val, > > > > unsigned width) > > > > { > > > > - acpi_pm1_cnt_write(opaque, val); > > > > + ACPIREGS *ar = opaque; > > > > + > > > > + if (addr == 1) { > > > > + val = val << 8 | (ar->pm1.cnt.cnt & 0xff); > > > > + } > > > > > > and this shift here look similar to my workaround in https://patchew.org/QEMU/20230524211104.686087-1-mark.cave-ayland@ilande.co.uk/20230524211104.686087-31-mark.cave-ayland@ilande.co.uk/ > > > which is a symptom of https://gitlab.com/qemu-project/qemu/-/issues/360. > > > > > > Whilst there is no imminent fix for the above issue, it may be worth a few > > > mins to determine if this is the same issue and if so document it with > > > comments accordingly as I did so that the workaround can be removed at a > > > later date. > > > > So I will add > > this triggers a but in memory core, > > (see > > https://gitlab.com/qemu-project/qemu/-/issues/360 for more detail) > > > > ? > > Apart from the typo but -> bug I'm not sure this is related to that issue > but in any case this does not trigger but works around some possible bug so > maybe "This work around may be related to issue URL" or something like that > maybe? I'm also not sure what comment to add where so I'd appreciate if you > can handle this on merging. > > Regards, > BALATON Zoltan I'll merge, just got back from travel. > > > > + ar->pm1.cnt.cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE); > > > > + > > > > + if (val & ACPI_BITMASK_SLEEP_ENABLE) { > > > > + /* change suspend type */ > > > > + uint16_t sus_typ = (val >> 10) & 7; > > > > + switch (sus_typ) { > > > > + case 0: /* soft power off */ > > > > + qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); > > > > + break; > > > > + case 1: > > > > + qemu_system_suspend_request(); > > > > + break; > > > > + default: > > > > + if (sus_typ == ar->pm1.cnt.s4_val) { /* S4 request */ > > > > + qapi_event_send_suspend_disk(); > > > > + qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); > > > > + } > > > > + break; > > > > + } > > > > + } > > > > } > > > > static const MemoryRegionOps acpi_pm_cnt_ops = { > > > > > > > > > ATB, > > > > > > Mark. > > > >