Misc HW patches for 2026-03-09

[PULL 07/49] hw/i386/iommu: Remove IntelIOMMUState::dma_drain field

Philippe Mathieu-Daudé posted 49 patches 1 month ago

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Maintainers: Gerd Hoffmann <kraxel@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Christian Schoenebeck <qemu_oss@crudebyte.com>, Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>, Viktor Prutyanov <viktor.prutyanov@phystech.edu>, "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Aurelien Jarno <aurelien@aurel32.net>, Igor Mammedov <imammedo@redhat.com>, Ani Sinha <anisinha@redhat.com>, Manos Pitsidianakis <manos.pitsidianakis@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, Yanan Wang <wangyanan55@huawei.com>, Zhao Liu <zhao1.liu@intel.com>, Paolo Bonzini <pbonzini@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Corey Minyard <cminyard@mvista.com>, Jason Wang <jasowang@redhat.com>, Yi Liu <yi.l.liu@intel.com>, "Clément Mathieu--Drif" <clement.mathieu--drif@bull.com>, Richard Henderson <richard.henderson@linaro.org>, Sergio Lopez <slp@redhat.com>, Alexander Graf <graf@amazon.com>, Dorjoy Chowdhury <dorjoychy111@gmail.com>, Joe Komlodi <komlodi@google.com>, "Cédric Le Goater" <clg@kaod.org>, Jamin Lin <jamin_lin@aspeedtech.com>, Nabih Estefan <nabihestefan@google.com>, Alistair Francis <Alistair.Francis@wdc.com>, Palmer Dabbelt <palmer@dabbelt.com>, Tyrone Ting <kfting@nuvoton.com>, Hao Wu <wuhaotsh@google.com>, Peter Maydell <peter.maydell@linaro.org>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, Artyom Tarasenko <atar4qemu@gmail.com>, Alex Williamson <alex@shazbot.org>, David Hildenbrand <david@kernel.org>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, Fabiano Rosas <farosas@suse.de>, Laurent Vivier <lvivier@redhat.com>, Markus Armbruster <armbru@redhat.com>, Michael Roth <michael.roth@amd.com>

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[PULL 07/49] hw/i386/iommu: Remove IntelIOMMUState::dma_drain field

Posted by Philippe Mathieu-Daudé 1 month ago

The IntelIOMMUState::dma_drain boolean was only set in
the pc_compat_3_1[] array, via the 'dma-drain=off' property.
We removed all machines using that array, lets remove that
property and all the code around it.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20260307152635.83893-7-philmd@linaro.org>
---
 include/hw/i386/intel_iommu.h |  1 -
 hw/i386/intel_iommu.c         | 11 +----------
 2 files changed, 1 insertion(+), 11 deletions(-)

diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h
index 54c2b6b77a0..e44ce318417 100644
--- a/include/hw/i386/intel_iommu.h
+++ b/include/hw/i386/intel_iommu.h
@@ -314,7 +314,6 @@ struct IntelIOMMUState {
     bool intr_eime;                 /* Extended interrupt mode enabled */
     OnOffAuto intr_eim;             /* Toggle for EIM cabability */
     uint8_t aw_bits;                /* Host/IOVA address width (in bits) */
-    bool dma_drain;                 /* Whether DMA r/w draining enabled */
     bool pasid;                     /* Whether to support PASID */
     bool fs1gp;                     /* First Stage 1-GByte Page Support */
 
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index d24ba989bfc..f395fa248c0 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -4205,7 +4205,6 @@ static const Property vtd_properties[] = {
     DEFINE_PROP_BOOL("snoop-control", IntelIOMMUState, snoop_control, false),
     DEFINE_PROP_BOOL("x-pasid-mode", IntelIOMMUState, pasid, false),
     DEFINE_PROP_BOOL("svm", IntelIOMMUState, svm, false),
-    DEFINE_PROP_BOOL("dma-drain", IntelIOMMUState, dma_drain, true),
     DEFINE_PROP_BOOL("stale-tm", IntelIOMMUState, stale_tm, false),
     DEFINE_PROP_BOOL("fs1gp", IntelIOMMUState, fs1gp, true),
 };
@@ -5000,11 +4999,8 @@ static void vtd_cap_init(IntelIOMMUState *s)
     X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s);
 
     s->cap = VTD_CAP_FRO | VTD_CAP_NFR | VTD_CAP_ND | VTD_ECAP_PT |
-             VTD_CAP_MAMV | VTD_CAP_PSI | VTD_CAP_SSLPS |
+             VTD_CAP_MAMV | VTD_CAP_PSI | VTD_CAP_SSLPS | VTD_CAP_DRAIN |
              VTD_CAP_ESRTPS | VTD_CAP_MGAW(s->aw_bits);
-    if (s->dma_drain) {
-        s->cap |= VTD_CAP_DRAIN;
-    }
     if (x86_iommu->dma_translation) {
             if (s->aw_bits >= VTD_HOST_AW_39BIT) {
                     s->cap |= VTD_CAP_SAGAW_39bit;
@@ -5582,11 +5578,6 @@ static bool vtd_decide_config(IntelIOMMUState *s, Error **errp)
         return false;
     }
 
-    if (s->scalable_mode && !s->dma_drain) {
-        error_setg(errp, "Need to set dma_drain for scalable mode");
-        return false;
-    }
-
     if (s->pasid && !s->scalable_mode) {
         error_setg(errp, "Need to set scalable mode for PASID");
         return false;
-- 
2.53.0