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authorEric Auger <eric.auger@redhat.com>2017-01-04 11:58:41 +0100
committerChristoffer Dall <cdall@linaro.org>2017-05-08 14:34:50 +0200
commit0979bfa69421279459b4516542503f1d577d2ec5 (patch)
tree92527d82e5ca9a1c7c264d9b13d8a61a57187e4b /virt
parent8331c23c28e8b7f70cb5c25366160d900ab127d7 (diff)
downloadlinux-sh-0979bfa69421279459b4516542503f1d577d2ec5.tar.gz
KVM: arm64: vgic-its: Implement vgic_mmio_uaccess_write_its_creadr
GITS_CREADR needs to be restored so let's implement the associated uaccess_write_its callback. The write only is allowed if the its is disabled. Signed-off-by: Eric Auger <eric.auger@redhat.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic/vgic-its.c42
1 files changed, 40 insertions, 2 deletions
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index fd2660d0d694..bf3ff0931572 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -1213,6 +1213,33 @@ static unsigned long vgic_mmio_read_its_creadr(struct kvm *kvm,
return extract_bytes(its->creadr, addr & 0x7, len);
}
+static int vgic_mmio_uaccess_write_its_creadr(struct kvm *kvm,
+ struct vgic_its *its,
+ gpa_t addr, unsigned int len,
+ unsigned long val)
+{
+ u32 cmd_offset;
+ int ret = 0;
+
+ mutex_lock(&its->cmd_lock);
+
+ if (its->enabled) {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ cmd_offset = ITS_CMD_OFFSET(val);
+ if (cmd_offset >= ITS_CMD_BUFFER_SIZE(its->cbaser)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ its->creadr = cmd_offset;
+out:
+ mutex_unlock(&its->cmd_lock);
+ return ret;
+}
+
#define BASER_INDEX(addr) (((addr) / sizeof(u64)) & 0x7)
static unsigned long vgic_mmio_read_its_baser(struct kvm *kvm,
struct vgic_its *its,
@@ -1317,6 +1344,16 @@ static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its,
.its_write = wr, \
}
+#define REGISTER_ITS_DESC_UACCESS(off, rd, wr, uwr, length, acc)\
+{ \
+ .reg_offset = off, \
+ .len = length, \
+ .access_flags = acc, \
+ .its_read = rd, \
+ .its_write = wr, \
+ .uaccess_its_write = uwr, \
+}
+
static void its_mmio_write_wi(struct kvm *kvm, struct vgic_its *its,
gpa_t addr, unsigned int len, unsigned long val)
{
@@ -1339,8 +1376,9 @@ static struct vgic_register_region its_registers[] = {
REGISTER_ITS_DESC(GITS_CWRITER,
vgic_mmio_read_its_cwriter, vgic_mmio_write_its_cwriter, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
- REGISTER_ITS_DESC(GITS_CREADR,
- vgic_mmio_read_its_creadr, its_mmio_write_wi, 8,
+ REGISTER_ITS_DESC_UACCESS(GITS_CREADR,
+ vgic_mmio_read_its_creadr, its_mmio_write_wi,
+ vgic_mmio_uaccess_write_its_creadr, 8,
VGIC_ACCESS_64bit | VGIC_ACCESS_32bit),
REGISTER_ITS_DESC(GITS_BASER,
vgic_mmio_read_its_baser, vgic_mmio_write_its_baser, 0x40,