From: "Michael S. Tsirkin" <mst@redhat.com> To: "Eugenio Pérez" <eperezma@redhat.com> Cc: Parav Pandit <parav@mellanox.com>, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, Stefan Hajnoczi <stefanha@redhat.com>, Eli Cohen <eli@mellanox.com> Subject: Re: [PATCH 2/3] vdpa: Add vhost_vdpa_section_end Date: Tue, 5 Oct 2021 04:15:43 -0400 [thread overview] Message-ID: <20211005041429-mutt-send-email-mst@kernel.org> (raw) In-Reply-To: <20211005080131.408506-3-eperezma@redhat.com> On Tue, Oct 05, 2021 at 10:01:30AM +0200, Eugenio Pérez wrote: > Abstract this operation, that will be reused when validating the region > against the iova range that the device supports. > > Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Note that as defined end is actually 1 byte beyond end of section. As such it can e.g. overflow if cast to u64. So be careful to use int128 ops with it. Also - document? > --- > hw/virtio/vhost-vdpa.c | 18 +++++++++++------- > 1 file changed, 11 insertions(+), 7 deletions(-) > > diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c > index ea1aa71ad8..a1de6c7c9c 100644 > --- a/hw/virtio/vhost-vdpa.c > +++ b/hw/virtio/vhost-vdpa.c > @@ -24,6 +24,15 @@ > #include "trace.h" > #include "qemu-common.h" > > +static Int128 vhost_vdpa_section_end(const MemoryRegionSection *section) > +{ > + Int128 llend = int128_make64(section->offset_within_address_space); > + llend = int128_add(llend, section->size); > + llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); > + > + return llend; > +} > + > static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection *section) > { > return (!memory_region_is_ram(section->mr) && > @@ -160,10 +169,7 @@ static void vhost_vdpa_listener_region_add(MemoryListener *listener, > } > > iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); > - llend = int128_make64(section->offset_within_address_space); > - llend = int128_add(llend, section->size); > - llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); > - > + llend = vhost_vdpa_section_end(section); > if (int128_ge(int128_make64(iova), llend)) { > return; > } > @@ -221,9 +227,7 @@ static void vhost_vdpa_listener_region_del(MemoryListener *listener, > } > > iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); > - llend = int128_make64(section->offset_within_address_space); > - llend = int128_add(llend, section->size); > - llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); > + llend = vhost_vdpa_section_end(section); > > trace_vhost_vdpa_listener_region_del(v, iova, int128_get64(llend)); > > -- > 2.27.0 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com> To: "Eugenio Pérez" <eperezma@redhat.com> Cc: Parav Pandit <parav@mellanox.com>, Jason Wang <jasowang@redhat.com>, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org, Stefan Hajnoczi <stefanha@redhat.com>, Eli Cohen <eli@mellanox.com>, Stefano Garzarella <sgarzare@redhat.com> Subject: Re: [PATCH 2/3] vdpa: Add vhost_vdpa_section_end Date: Tue, 5 Oct 2021 04:15:43 -0400 [thread overview] Message-ID: <20211005041429-mutt-send-email-mst@kernel.org> (raw) In-Reply-To: <20211005080131.408506-3-eperezma@redhat.com> On Tue, Oct 05, 2021 at 10:01:30AM +0200, Eugenio Pérez wrote: > Abstract this operation, that will be reused when validating the region > against the iova range that the device supports. > > Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Note that as defined end is actually 1 byte beyond end of section. As such it can e.g. overflow if cast to u64. So be careful to use int128 ops with it. Also - document? > --- > hw/virtio/vhost-vdpa.c | 18 +++++++++++------- > 1 file changed, 11 insertions(+), 7 deletions(-) > > diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c > index ea1aa71ad8..a1de6c7c9c 100644 > --- a/hw/virtio/vhost-vdpa.c > +++ b/hw/virtio/vhost-vdpa.c > @@ -24,6 +24,15 @@ > #include "trace.h" > #include "qemu-common.h" > > +static Int128 vhost_vdpa_section_end(const MemoryRegionSection *section) > +{ > + Int128 llend = int128_make64(section->offset_within_address_space); > + llend = int128_add(llend, section->size); > + llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); > + > + return llend; > +} > + > static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection *section) > { > return (!memory_region_is_ram(section->mr) && > @@ -160,10 +169,7 @@ static void vhost_vdpa_listener_region_add(MemoryListener *listener, > } > > iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); > - llend = int128_make64(section->offset_within_address_space); > - llend = int128_add(llend, section->size); > - llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); > - > + llend = vhost_vdpa_section_end(section); > if (int128_ge(int128_make64(iova), llend)) { > return; > } > @@ -221,9 +227,7 @@ static void vhost_vdpa_listener_region_del(MemoryListener *listener, > } > > iova = TARGET_PAGE_ALIGN(section->offset_within_address_space); > - llend = int128_make64(section->offset_within_address_space); > - llend = int128_add(llend, section->size); > - llend = int128_and(llend, int128_exts64(TARGET_PAGE_MASK)); > + llend = vhost_vdpa_section_end(section); > > trace_vhost_vdpa_listener_region_del(v, iova, int128_get64(llend)); > > -- > 2.27.0
next prev parent reply other threads:[~2021-10-05 8:15 UTC|newest] Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-10-05 8:01 [PATCH 0/3] vdpa: Check iova range on memory regions ops Eugenio Pérez 2021-10-05 8:01 ` [PATCH 1/3] vdpa: Skip protected ram IOMMU mappings Eugenio Pérez 2021-10-05 8:01 ` [PATCH 2/3] vdpa: Add vhost_vdpa_section_end Eugenio Pérez 2021-10-05 8:15 ` Michael S. Tsirkin [this message] 2021-10-05 8:15 ` Michael S. Tsirkin 2021-10-05 9:52 ` Eugenio Perez Martin 2021-10-05 10:47 ` Michael S. Tsirkin 2021-10-05 10:47 ` Michael S. Tsirkin 2021-10-05 13:14 ` Eugenio Perez Martin 2021-10-05 8:01 ` [PATCH 3/3] vdpa: Check for iova range at mappings changes Eugenio Pérez 2021-10-05 8:14 ` Michael S. Tsirkin 2021-10-05 8:14 ` Michael S. Tsirkin 2021-10-05 9:58 ` Eugenio Perez Martin 2021-10-05 10:46 ` Michael S. Tsirkin 2021-10-05 10:46 ` Michael S. Tsirkin
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