diff options
| author | Anup Patel <anup.patel@wdc.com> | 2021-09-27 17:10:06 +0530 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-10-04 15:51:47 +0530 |
| commit | 9f7013265112a92340cef5debec8d02ec8d1de06 (patch) | |
| tree | 4f77126d24e2124aa992f910012f49ce260602fa /arch/riscv/kvm/mmu.c | |
| parent | 34bde9d8b9e6e5249db3c07cf1ebfe75c23c671c (diff) | |
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/mmu.c')
| -rw-r--r-- | arch/riscv/kvm/mmu.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c index abfd2b22fa8e..8ec10ef861e7 100644 --- a/arch/riscv/kvm/mmu.c +++ b/arch/riscv/kvm/mmu.c @@ -58,6 +58,14 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, return 0; } +int kvm_riscv_stage2_map(struct kvm_vcpu *vcpu, + struct kvm_memory_slot *memslot, + gpa_t gpa, unsigned long hva, bool is_write) +{ + /* TODO: */ + return 0; +} + void kvm_riscv_stage2_flush_cache(struct kvm_vcpu *vcpu) { /* TODO: */ |