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Re: [RFC PATCH v2 6/7] accel/kvm: Let KVM_EXIT_MMIO return error
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From: |
Paolo Bonzini |
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Subject: |
Re: [RFC PATCH v2 6/7] accel/kvm: Let KVM_EXIT_MMIO return error |
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Date: |
Thu, 21 May 2020 17:39:51 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 |
On 18/05/20 18:01, Peter Maydell wrote:
> The "right" answer is that the kernel should enhance the KVM_EXIT_MMIO
> API to allow userspace to say "sorry, you got a bus error on that
> memory access the guest just tried" (which the kernel then has to
> turn into an appropriate guest exception, or ignore, depending on
> what the architecture requires.) You don't want to set ret to
> non-zero here, because that will cause us to VM_STOP, and I
> suspect that x86 at least is relying on the implict RAZ/WI
> behaviour it currently gets.
Yes, it is. It may even be already possible to inject the right
exception (on ARM) through KVM_SET_VCPU_EVENTS or something like that, too.
Paolo
- [PATCH v2 1/7] exec: Let address_space_read/write_cached() propagate MemTxResult, (continued)
- [PATCH v2 1/7] exec: Let address_space_read/write_cached() propagate MemTxResult, Philippe Mathieu-Daudé, 2020/05/18
- [PATCH v2 2/7] exec: Propagate cpu_memory_rw_debug() error, Philippe Mathieu-Daudé, 2020/05/18
- [PATCH v2 4/7] hw/elf_ops: Do not ignore write failures when loading ELF, Philippe Mathieu-Daudé, 2020/05/18
- [PATCH v2 5/7] hw/arm/boot: Abort if set_kernel_args() fails, Philippe Mathieu-Daudé, 2020/05/18
- [RFC PATCH v2 6/7] accel/kvm: Let KVM_EXIT_MMIO return error, Philippe Mathieu-Daudé, 2020/05/18
- [PATCH v2 3/7] disas: Let disas::read_memory() handler return EIO on error, Philippe Mathieu-Daudé, 2020/05/18
- [RFC PATCH v2 7/7] hw/core/loader: Assert loading ROM regions succeeds at reset, Philippe Mathieu-Daudé, 2020/05/18
- Re: [PATCH v2 0/7] exec/memory: Enforce checking MemTxResult values, Paolo Bonzini, 2020/05/21