From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54692) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dUvez-00051r-JQ for qemu-devel@nongnu.org; Tue, 11 Jul 2017 09:57:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dUvex-0004FE-1e for qemu-devel@nongnu.org; Tue, 11 Jul 2017 09:57:05 -0400 Received: from mx1.redhat.com ([209.132.183.28]:54068) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dUvew-0004Eu-Pw for qemu-devel@nongnu.org; Tue, 11 Jul 2017 09:57:02 -0400 From: Thomas Huth Date: Tue, 11 Jul 2017 15:56:33 +0200 Message-Id: <1499781397-19749-8-git-send-email-thuth@redhat.com> In-Reply-To: <1499781397-19749-1-git-send-email-thuth@redhat.com> References: <1499781397-19749-1-git-send-email-thuth@redhat.com> Subject: [Qemu-devel] [PATCH v4 07/11] pc-bios/s390-ccw: Add code for virtio feature negotiation List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, Christian Borntraeger , Cornelia Huck Cc: Alexander Graf , Farhan Ali , David Hildenbrand , Viktor Mihajlovski , Alexey Kardashevskiy The upcoming virtio-net driver needs to negotiate some features, so we need the possibility to do this in the core virtio code. Signed-off-by: Thomas Huth --- pc-bios/s390-ccw/s390-ccw.h | 2 ++ pc-bios/s390-ccw/virtio.c | 23 +++++++++++++++++------ pc-bios/s390-ccw/virtio.h | 1 + 3 files changed, 20 insertions(+), 6 deletions(-) diff --git a/pc-bios/s390-ccw/s390-ccw.h b/pc-bios/s390-ccw/s390-ccw.h index 6fdc858..25d4d21 100644 --- a/pc-bios/s390-ccw/s390-ccw.h +++ b/pc-bios/s390-ccw/s390-ccw.h @@ -44,6 +44,8 @@ typedef unsigned long long __u64; ((b) == 0 ? (a) : (MIN(a, b)))) #endif +#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) + #include "cio.h" #include "iplb.h" diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c index 9d9e61f..18fc5d1 100644 --- a/pc-bios/s390-ccw/virtio.c +++ b/pc-bios/s390-ccw/virtio.c @@ -12,6 +12,7 @@ #include "s390-ccw.h" #include "virtio.h" #include "virtio-scsi.h" +#include "bswap.h" #define VRING_WAIT_REPLY_TIMEOUT 3 @@ -249,8 +250,12 @@ int virtio_run(VDev *vdev, int vqid, VirtioCmd *cmd) void virtio_setup_ccw(VDev *vdev) { - int i, cfg_size = 0; + int i, rc, cfg_size = 0; unsigned char status = VIRTIO_CONFIG_S_DRIVER_OK; + struct VirtioFeatureDesc { + uint32_t features; + uint8_t index; + } __attribute__((packed)) feats; IPL_assert(virtio_is_supported(vdev->schid), "PE"); /* device ID has been established now */ @@ -277,11 +282,17 @@ void virtio_setup_ccw(VDev *vdev) IPL_assert(run_ccw(vdev, CCW_CMD_READ_CONF, &vdev->config, cfg_size) == 0, "Could not get block device configuration"); - /* - * Skipping CCW_CMD_READ_FEAT. We're not doing anything fancy, and - * we'll just stop dead anyway if anything does not work like we - * expect it. - */ + /* Feature negotiation */ + for (i = 0; i < ARRAY_SIZE(vdev->guest_features); i++) { + feats.features = 0; + feats.index = i; + rc = run_ccw(vdev, CCW_CMD_READ_FEAT, &feats, sizeof(feats)); + IPL_assert(rc == 0, "Could not get features bits"); + vdev->guest_features[i] &= bswap32(feats.features); + feats.features = bswap32(vdev->guest_features[i]); + rc = run_ccw(vdev, CCW_CMD_WRITE_FEAT, &feats, sizeof(feats)); + IPL_assert(rc == 0, "Could not set features bits"); + } for (i = 0; i < vdev->nr_vqs; i++) { VqInfo info = { diff --git a/pc-bios/s390-ccw/virtio.h b/pc-bios/s390-ccw/virtio.h index d733780..a00a320 100644 --- a/pc-bios/s390-ccw/virtio.h +++ b/pc-bios/s390-ccw/virtio.h @@ -251,6 +251,7 @@ struct VDev { ScsiDevice selected_scsi_device; uint64_t netboot_start_addr; uint32_t max_transfer; + uint32_t guest_features[2]; }; typedef struct VDev VDev; -- 1.8.3.1