From: Matthew Rosato <mjrosato@linux.ibm.com>
To: Pierre Morel <pmorel@linux.ibm.com>, linux-s390@vger.kernel.org
Cc: alex.williamson@redhat.com, cohuck@redhat.com,
schnelle@linux.ibm.com, farman@linux.ibm.com,
borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com,
gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com,
frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com,
vneethv@linux.ibm.com, oberpar@linux.ibm.com,
freude@linux.ibm.com, thuth@redhat.com, pasic@linux.ibm.com,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 22/30] KVM: s390: intercept the rpcit instruction
Date: Tue, 18 Jan 2022 12:27:25 -0500 [thread overview]
Message-ID: <e474b7a1-66de-1ede-3bbf-ccd7eff9eb7c@linux.ibm.com> (raw)
In-Reply-To: <6eb0b596-c8b7-3529-55af-f3101821c74b@linux.ibm.com>
On 1/18/22 6:05 AM, Pierre Morel wrote:
>
>
> On 1/14/22 21:31, Matthew Rosato wrote:
>> For faster handling of PCI translation refreshes, intercept in KVM
>> and call the associated handler.
>>
>> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
>> ---
>> arch/s390/kvm/priv.c | 46 ++++++++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 46 insertions(+)
>>
>> diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
>> index 417154b314a6..5b65c1830de2 100644
>> --- a/arch/s390/kvm/priv.c
>> +++ b/arch/s390/kvm/priv.c
>> @@ -29,6 +29,7 @@
>> #include <asm/ap.h>
>> #include "gaccess.h"
>> #include "kvm-s390.h"
>> +#include "pci.h"
>> #include "trace.h"
>> static int handle_ri(struct kvm_vcpu *vcpu)
>> @@ -335,6 +336,49 @@ static int handle_rrbe(struct kvm_vcpu *vcpu)
>> return 0;
>> }
>> +static int handle_rpcit(struct kvm_vcpu *vcpu)
>> +{
>> + int reg1, reg2;
>> + u8 status;
>> + int rc;
>> +
>> + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
>> + return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
>> +
>> + /* If the host doesn't support PCI, it must be an emulated device */
>> + if (!IS_ENABLED(CONFIG_PCI))
>> + return -EOPNOTSUPP;
>
> AFAIU this makes also sure that the following code is not compiled in
> case PCI is not supported.
>
> I am not very used to compilation options, is it true with all our
> compilers and options?
> Or do we have to specify a compiler version?
>
> Another concern is, shouldn't we use IS_ENABLED(CONFIG_VFIO_PCI) ?
Same idea as in the other thread -- What we are trying to protect
against here is referencing symbols that won't be linked (like
zpci_refresh_trans, or the aift->mdd a few lines below)
It is indeed true that we should never need to handle the rpcit
intercept in KVM if CONFIG_VFIO_PCI=n -- but the necessary symbols/code
are linked at least, so we can just let the SHM logic sort this out.
When CONFIG_PCI=y|m, arch/s390/kvm/pci.o will be linked and so we can
compare the function handle against afit->mdd (check to see if the
device is emulated) and use this to determine whether or not to
immediately send to userspace -- And if CONFIG_VFIO_PCI=n, a SHM bit
will always be on and so we'll always go to userspace via this check.
>
>
>
>> +
>> + kvm_s390_get_regs_rre(vcpu, ®1, ®2);
>> +
>> + /* If the device has a SHM bit on, let userspace take care of
>> this */
>> + if (((vcpu->run->s.regs.gprs[reg1] >> 32) & aift->mdd) != 0)
>> + return -EOPNOTSUPP;
>> +
>> + rc = kvm_s390_pci_refresh_trans(vcpu, vcpu->run->s.regs.gprs[reg1],
>> + vcpu->run->s.regs.gprs[reg2],
>> + vcpu->run->s.regs.gprs[reg2+1],
>> + &status);
>> +
>> + switch (rc) {
>> + case 0:
>> + kvm_s390_set_psw_cc(vcpu, 0);
>> + break;
>> + case -EOPNOTSUPP:
>> + return -EOPNOTSUPP;
>> + default:
>> + vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00ffffffUL;
>> + vcpu->run->s.regs.gprs[reg1] |= (u64) status << 24;
>> + if (status != 0)
>> + kvm_s390_set_psw_cc(vcpu, 1);
>> + else
>> + kvm_s390_set_psw_cc(vcpu, 3);
>> + break;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> #define SSKE_NQ 0x8
>> #define SSKE_MR 0x4
>> #define SSKE_MC 0x2
>> @@ -1275,6 +1319,8 @@ int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
>> return handle_essa(vcpu);
>> case 0xaf:
>> return handle_pfmf(vcpu);
>> + case 0xd3:
>> + return handle_rpcit(vcpu);
>> default:
>> return -EOPNOTSUPP;
>> }
>>
>
next prev parent reply other threads:[~2022-01-18 17:27 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-14 20:31 [PATCH v2 00/30] KVM: s390: enable zPCI for interpretive execution Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 01/30] s390/sclp: detect the zPCI load/store interpretation facility Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 02/30] s390/sclp: detect the AISII facility Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 03/30] s390/sclp: detect the AENI facility Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 04/30] s390/sclp: detect the AISI facility Matthew Rosato
2022-01-17 7:57 ` Thomas Huth
2022-01-14 20:31 ` [PATCH v2 05/30] s390/airq: pass more TPI info to airq handlers Matthew Rosato
2022-01-17 8:27 ` Thomas Huth
2022-01-14 20:31 ` [PATCH v2 06/30] s390/airq: allow for airq structure that uses an input vector Matthew Rosato
2022-01-17 12:29 ` Claudio Imbrenda
2022-01-18 18:52 ` Matthew Rosato
2022-01-18 9:50 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 07/30] s390/pci: externalize the SIC operation controls and routine Matthew Rosato
2022-01-17 16:19 ` Niklas Schnelle
2022-01-26 10:07 ` Claudio Imbrenda
2022-01-27 9:57 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 08/30] s390/pci: stash associated GISA designation Matthew Rosato
2022-01-24 14:08 ` Pierre Morel
2022-01-24 15:12 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 09/30] s390/pci: export some routines related to RPCIT processing Matthew Rosato
2022-01-18 9:51 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 10/30] s390/pci: stash dtsm and maxstbl Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 11/30] s390/pci: add helper function to find device by handle Matthew Rosato
2022-01-18 9:53 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 12/30] s390/pci: get SHM information from list pci Matthew Rosato
2022-01-18 10:36 ` Pierre Morel
2022-01-26 10:13 ` Claudio Imbrenda
2022-01-27 13:41 ` Pierre Morel
2022-01-27 15:14 ` Matthew Rosato
2022-01-27 10:29 ` Niklas Schnelle
2022-01-14 20:31 ` [PATCH v2 13/30] s390/pci: return status from zpci_refresh_trans Matthew Rosato
2022-01-19 18:13 ` Pierre Morel
2022-01-26 10:45 ` Claudio Imbrenda
2022-01-27 10:30 ` Niklas Schnelle
2022-01-14 20:31 ` [PATCH v2 14/30] KVM: s390: pci: add basic kvm_zdev structure Matthew Rosato
2022-01-17 16:25 ` Pierre Morel
2022-01-18 17:32 ` Pierre Morel
2022-01-18 18:39 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 15/30] KVM: s390: pci: do initial setup for AEN interpretation Matthew Rosato
2022-01-19 18:06 ` Pierre Morel
2022-01-19 20:19 ` Matthew Rosato
2022-01-25 12:23 ` Pierre Morel
2022-01-25 14:57 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 16/30] KVM: s390: pci: enable host forwarding of Adapter Event Notifications Matthew Rosato
2022-01-17 17:38 ` Pierre Morel
2022-01-18 17:25 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 17/30] KVM: s390: mechanism to enable guest zPCI Interpretation Matthew Rosato
2022-01-24 14:24 ` Pierre Morel
2022-01-24 15:28 ` Matthew Rosato
2022-01-24 17:15 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 18/30] KVM: s390: pci: provide routines for enabling/disabling interpretation Matthew Rosato
2022-01-24 14:36 ` Pierre Morel
2022-01-24 15:14 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 19/30] KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding Matthew Rosato
2022-01-25 12:41 ` Pierre Morel
2022-01-25 15:44 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 20/30] KVM: s390: pci: provide routines for enabling/disabling IOAT assist Matthew Rosato
2022-01-25 13:29 ` Pierre Morel
2022-01-25 14:47 ` Matthew Rosato
2022-01-26 8:30 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 21/30] KVM: s390: pci: handle refresh of PCI translations Matthew Rosato
2022-01-19 9:29 ` Pierre Morel
2022-01-19 16:39 ` Matthew Rosato
2022-01-19 18:25 ` Pierre Morel
2022-01-19 20:02 ` Matthew Rosato
2022-01-20 9:47 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 22/30] KVM: s390: intercept the rpcit instruction Matthew Rosato
2022-01-18 11:05 ` Pierre Morel
2022-01-18 17:27 ` Matthew Rosato [this message]
2022-01-18 17:54 ` Pierre Morel
2022-01-19 14:06 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 23/30] vfio/pci: re-introduce CONFIG_VFIO_PCI_ZDEV Matthew Rosato
2022-01-18 17:20 ` Pierre Morel
2022-01-18 17:32 ` Matthew Rosato
2022-01-18 17:45 ` Pierre Morel
2022-01-18 18:05 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 24/30] vfio-pci/zdev: wire up group notifier Matthew Rosato
2022-01-18 17:34 ` Pierre Morel
2022-01-18 18:37 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 25/30] vfio-pci/zdev: wire up zPCI interpretive execution support Matthew Rosato
2022-01-25 13:01 ` Pierre Morel
2022-01-25 14:21 ` Matthew Rosato
2022-01-14 20:31 ` [PATCH v2 26/30] vfio-pci/zdev: wire up zPCI adapter interrupt forwarding support Matthew Rosato
2022-01-19 17:10 ` Pierre Morel
2022-01-19 17:20 ` Matthew Rosato
2022-01-25 12:36 ` Pierre Morel
2022-01-25 14:16 ` Matthew Rosato
2022-01-26 8:24 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 27/30] vfio-pci/zdev: wire up zPCI IOAT assist support Matthew Rosato
2022-01-19 14:03 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 28/30] vfio-pci/zdev: add DTSM to clp group capability Matthew Rosato
2022-01-19 13:48 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 29/30] KVM: s390: introduce CPU feature for zPCI Interpretation Matthew Rosato
2022-01-19 13:39 ` Pierre Morel
2022-01-14 20:31 ` [PATCH v2 30/30] MAINTAINERS: additional files related kvm s390 pci passthrough Matthew Rosato
2022-01-14 20:49 ` [PATCH v2 00/30] KVM: s390: enable zPCI for interpretive execution Matthew Rosato
2022-01-19 18:10 ` Pierre Morel
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