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    Subject[PATCH v2 22/30] KVM: s390: intercept the rpcit instruction
    Date
    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;
    +
    + kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
    +
    + /* 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;
    }
    --
    2.27.0
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