Re: [RFC 3/8] s390x/pci: fix pcistb length

[Cornelia Huck <cohuck@redhat.com>]

On Thu, 10 Dec 2020 10:15:06 -0500
Matthew Rosato <mjrosato@linux.ibm.com> wrote:

> On 12/10/20 5:30 AM, Cornelia Huck wrote:
> > On Wed,  9 Dec 2020 15:34:21 -0500
> > Matthew Rosato <mjrosato@linux.ibm.com> wrote:
> >   
> >> In pcistb_service_call, we are grabbing 8 bits from a guest register to
> >> indicate the length of the store operation -- but per the architecture
> >> the length is actually defined by 13 bits of the guest register.
> >>
> >> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> >> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
> >> ---
> >>   hw/s390x/s390-pci-inst.c | 4 ++--
> >>   1 file changed, 2 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/hw/s390x/s390-pci-inst.c b/hw/s390x/s390-pci-inst.c
> >> index 70bfd91..db86f12 100644
> >> --- a/hw/s390x/s390-pci-inst.c
> >> +++ b/hw/s390x/s390-pci-inst.c
> >> @@ -750,7 +750,7 @@ int pcistb_service_call(S390CPU *cpu, uint8_t r1, uint8_t r3, uint64_t gaddr,
> >>       int i;
> >>       uint32_t fh;
> >>       uint8_t pcias;
> >> -    uint8_t len;
> >> +    uint16_t len;
> >>       uint8_t buffer[128];
> >>   
> >>       if (env->psw.mask & PSW_MASK_PSTATE) {
> >> @@ -760,7 +760,7 @@ int pcistb_service_call(S390CPU *cpu, uint8_t r1, uint8_t r3, uint64_t gaddr,
> >>   
> >>       fh = env->regs[r1] >> 32;
> >>       pcias = (env->regs[r1] >> 16) & 0xf;
> >> -    len = env->regs[r1] & 0xff;
> >> +    len = env->regs[r1] & 0x1fff;
> >>       offset = env->regs[r3];
> >>   
> >>       if (!(fh & FH_MASK_ENABLE)) {  
> > 
> > Is that a general problem that we just did not notice before?
> > 
> > If yes, this probably deserves a Fixes: tag and can be queued
> > independently of the rest of the series.
> >   
> 
> Good point.  I can split this out, and same for "s390x/pci: Fix 
> memory_region_access_valid call"
> 

Any plans for sending this? I'm currently collecting patches for a last
pull request before the holidays; but I'm sure there will be more pull
requests next year :)