| Message ID | 1492164934-988-9-git-send-email-eric.auger@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, Apr 14, 2017 at 3:45 PM, Eric Auger <eric.auger@redhat.com> wrote: > 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> Tested-by: Prakash, Brahmajyosyula <Brahmajyosyula.Prakash@cavium.com>
On Fri, Apr 14, 2017 at 12:15:20PM +0200, Eric Auger wrote: > 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> > > --- > v4 -> v5: > - keep Stalled bit > - vgic_mmio_uaccess_write_its_creadr can now return an error > > 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 | 42 ++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 40 insertions(+), 2 deletions(-) > > diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c > index a9a2c12..79ed1c2 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) > +{ > + int ret = 0; > + u32 reg; > + > + mutex_lock(&its->cmd_lock); > + > + if (its->enabled) { > + ret = -EBUSY; > + goto out; > + } > + > + reg = update_64bit_reg(its->creadr, addr & 7, len, val); you theoretically don't need this, since you prevent 32-bit accesses to this register, but I guess it doesn't hurt... > + if (ITS_CMD_OFFSET(reg) >= ITS_CMD_BUFFER_SIZE(its->cbaser)) { > + ret = -EINVAL; > + goto out; > + } can the creadr value be unaligned to the command size? I don't think you check that anywhere here? Thanks, -Christoffer > + > + its->creadr = reg; > +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, > -- > 2.5.5 >
Hi, On 27/04/2017 13:27, Christoffer Dall wrote: > On Fri, Apr 14, 2017 at 12:15:20PM +0200, Eric Auger wrote: >> 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> >> >> --- >> v4 -> v5: >> - keep Stalled bit >> - vgic_mmio_uaccess_write_its_creadr can now return an error >> >> 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 | 42 ++++++++++++++++++++++++++++++++++++++++-- >> 1 file changed, 40 insertions(+), 2 deletions(-) >> >> diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c >> index a9a2c12..79ed1c2 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) >> +{ >> + int ret = 0; >> + u32 reg; >> + >> + mutex_lock(&its->cmd_lock); >> + >> + if (its->enabled) { >> + ret = -EBUSY; >> + goto out; >> + } >> + >> + reg = update_64bit_reg(its->creadr, addr & 7, len, val); > > you theoretically don't need this, since you prevent 32-bit accesses to > this register, but I guess it doesn't hurt... OK > >> + if (ITS_CMD_OFFSET(reg) >= ITS_CMD_BUFFER_SIZE(its->cbaser)) { >> + ret = -EINVAL; >> + goto out; >> + } > > can the creadr value be unaligned to the command size? I don't think > you check that anywhere here? makes sense. I will add this check. Thanks! Eric > > Thanks, > -Christoffer > >> + >> + its->creadr = reg; >> +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, >> -- >> 2.5.5 >>
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c index a9a2c12..79ed1c2 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) +{ + int ret = 0; + u32 reg; + + mutex_lock(&its->cmd_lock); + + if (its->enabled) { + ret = -EBUSY; + goto out; + } + + reg = update_64bit_reg(its->creadr, addr & 7, len, val); + if (ITS_CMD_OFFSET(reg) >= ITS_CMD_BUFFER_SIZE(its->cbaser)) { + ret = -EINVAL; + goto out; + } + + its->creadr = reg; +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,
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> --- v4 -> v5: - keep Stalled bit - vgic_mmio_uaccess_write_its_creadr can now return an error 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 | 42 ++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 40 insertions(+), 2 deletions(-)