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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [PATCH v2] hw/isa/lpc_ich9: inject SMI on all VCPUs if APM_STS == 'Q' |
Date: | Wed, 16 Nov 2016 15:05:23 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 |
On 16/11/2016 14:18, Michael S. Tsirkin wrote: > > - we could have another magic 0xB2 value, which is implemented directly > > in QEMU and sets 0xB3 to a magic value. Then OVMF can invoke it > > after SMBASE relocation and SMM IPL (so as not to crash on old QEMUs) > > to detect the new feature. It can fail to start if using traditional > > AP and the new feature is not there. > > If we keep collecting these magic values, should architect it > and do a host/guest bitmap like virtio does? The value written in 0xB3 can certainly be a feature bitmap. For now we would have for example bit 0 if set, writing 0x10-0xFF to 0xB2 results in a broadcast SMI bit 1-7 zero Paolo
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