diff options
| author | Anup Patel <anup.patel@wdc.com> | 2021-09-27 14:40:06 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-10-04 13:21:47 +0300 |
| commit | 9f7013265112a92340cef5debec8d02ec8d1de06 (patch) | |
| tree | 4f77126d24e2124aa992f910012f49ce260602fa /arch/riscv/kvm/vm.c | |
| parent | 34bde9d8b9e6e5249db3c07cf1ebfe75c23c671c (diff) | |
| download | linux-9f7013265112a92340cef5debec8d02ec8d1de06.tar.xz | |
RISC-V: KVM: Handle MMIO exits for VCPU
We will get stage2 page faults whenever Guest/VM access SW emulated
MMIO device or unmapped Guest RAM.
This patch implements MMIO read/write emulation by extracting MMIO
details from the trapped load/store instruction and forwarding the
MMIO read/write to user-space. The actual MMIO emulation will happen
in user-space and KVM kernel module will only take care of register
updates before resuming the trapped VCPU.
The handling for stage2 page faults for unmapped Guest RAM will be
implemeted by a separate patch later.
[jiangyifei: ioeventfd and in-kernel mmio device support]
Signed-off-by: Yifei Jiang <jiangyifei@huawei.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alexander Graf <graf@amazon.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/kvm/vm.c')
| -rw-r--r-- | arch/riscv/kvm/vm.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c index 22490803d904..ad38c575c0bd 100644 --- a/arch/riscv/kvm/vm.c +++ b/arch/riscv/kvm/vm.c @@ -62,6 +62,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) int r; switch (ext) { + case KVM_CAP_IOEVENTFD: case KVM_CAP_DEVICE_CTRL: case KVM_CAP_USER_MEMORY: case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |