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 <[email protected]> --- v3 -> v4: - REGISTER_ITS_DESC_UACCESS now introduced in this patch - we now check the its is disabled --- virt/kvm/arm/vgic/vgic-its.c | 37 +++++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index 9b9ea86..a5f3abe 100644 --- a/virt/kvm/arm/vgic/vgic-its.c +++ b/virt/kvm/arm/vgic/vgic-its.c @@ -1213,6 +1213,28 @@ static unsigned long vgic_mmio_read_its_creadr(struct kvm *kvm, return extract_bytes(its->creadr, addr & 0x7, len); } +static void vgic_mmio_uaccess_write_its_creadr(struct kvm *kvm, + struct vgic_its *its, + gpa_t addr, unsigned int len, + unsigned long val) +{ + u32 reg; + + mutex_lock(&its->cmd_lock); + + if (its->enabled) + goto out; + + reg = update_64bit_reg(its->creadr, addr & 7, len, val); + reg = ITS_CMD_OFFSET(reg); + if (reg >= ITS_CMD_BUFFER_SIZE(its->cbaser)) + goto out; + + its->creadr = reg; +out: + mutex_unlock(&its->cmd_lock); +} + #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 +1339,16 @@ 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 +1371,9 @@ 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, -- 2.5.5 _______________________________________________ kvmarm mailing list [email protected] https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
