lkml.org 
[lkml]   [2023]   [Feb]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Subject[PATCH v5 04/14] RISC-V: KVM: Define a probe function for SBI extension data structures
    Date
    Currently the probe function just checks if an SBI extension is
    registered or not. However, the extension may not want to advertise
    itself depending on some other condition.
    An additional extension specific probe function will allow
    extensions to decide if they want to be advertised to the caller or
    not. Any extension that does not require additional dependency checks
    can avoid implementing this function.

    Reviewed-by: Anup Patel <anup@brainfault.org>
    Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
    Signed-off-by: Atish Patra <atishp@rivosinc.com>
    ---
    arch/riscv/include/asm/kvm_vcpu_sbi.h | 3 +++
    arch/riscv/kvm/vcpu_sbi_base.c | 7 +++++--
    2 files changed, 8 insertions(+), 2 deletions(-)

    diff --git a/arch/riscv/include/asm/kvm_vcpu_sbi.h b/arch/riscv/include/asm/kvm_vcpu_sbi.h
    index f79478a..45ba341 100644
    --- a/arch/riscv/include/asm/kvm_vcpu_sbi.h
    +++ b/arch/riscv/include/asm/kvm_vcpu_sbi.h
    @@ -29,6 +29,9 @@ struct kvm_vcpu_sbi_extension {
    int (*handler)(struct kvm_vcpu *vcpu, struct kvm_run *run,
    unsigned long *out_val, struct kvm_cpu_trap *utrap,
    bool *exit);
    +
    + /* Extension specific probe function */
    + unsigned long (*probe)(struct kvm_vcpu *vcpu);
    };

    void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run);
    diff --git a/arch/riscv/kvm/vcpu_sbi_base.c b/arch/riscv/kvm/vcpu_sbi_base.c
    index 5d65c63..be47828 100644
    --- a/arch/riscv/kvm/vcpu_sbi_base.c
    +++ b/arch/riscv/kvm/vcpu_sbi_base.c
    @@ -19,6 +19,7 @@ static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
    {
    int ret = 0;
    struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
    + const struct kvm_vcpu_sbi_extension *sbi_ext;

    switch (cp->a6) {
    case SBI_EXT_BASE_GET_SPEC_VERSION:
    @@ -43,8 +44,10 @@ static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
    */
    kvm_riscv_vcpu_sbi_forward(vcpu, run);
    *exit = true;
    - } else
    - *out_val = kvm_vcpu_sbi_find_ext(cp->a0) ? 1 : 0;
    + } else {
    + sbi_ext = kvm_vcpu_sbi_find_ext(cp->a0);
    + *out_val = sbi_ext && sbi_ext->probe ? sbi_ext->probe(vcpu) : !!sbi_ext;
    + }
    break;
    case SBI_EXT_BASE_GET_MVENDORID:
    *out_val = vcpu->arch.mvendorid;
    --
    2.25.1
    \
     
     \ /
      Last update: 2023-03-27 00:10    [W:2.896 / U:0.420 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site