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Re: [RFC 3/8] s390x/pci: fix pcistb length
From: |
Cornelia Huck |
Subject: |
Re: [RFC 3/8] s390x/pci: fix pcistb length |
Date: |
Thu, 10 Dec 2020 11:30:06 +0100 |
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.
[RFC 3/8] s390x/pci: fix pcistb length, Matthew Rosato, 2020/12/09
- Re: [RFC 3/8] s390x/pci: fix pcistb length,
Cornelia Huck <=
[RFC 4/8] s390x/pci: Introduce the ZpciOps structure, Matthew Rosato, 2020/12/09
[RFC 5/8] s390x/pci: Fix memory_region_access_valid call, Matthew Rosato, 2020/12/09
[RFC 1/8] linux-headers: update against 5.10-rc7, Matthew Rosato, 2020/12/09
[RFC 8/8] s390x/pci: PCILG via the vfio zPCI I/O region, Matthew Rosato, 2020/12/09
[RFC 6/8] s390x/pci: Handle devices that support relaxed alignment, Matthew Rosato, 2020/12/09
[RFC 7/8] s390x/pci: PCISTB via the vfio zPCI I/O region, Matthew Rosato, 2020/12/09