On 04.12.20 02:18, David Woodhouse wrote:
From: David Woodhouse <dwmw@xxxxxxxxxxxx> Disambiguate Xen vs. Hyper-V calls by adding 'orl $0x80000000, %eax' at the start of the Hyper-V hypercall page when Xen hypercalls are also enabled. That bit is reserved in the Hyper-V ABI, and those hypercall numbers will never be used by Xen (because it does precisely the same trick). Switch to using kvm_vcpu_write_guest() while we're at it, instead of open-coding it. Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
I'm not a big fan of the implicit assumption that "xen hypercall enabled" means "this will be the offset". Can we make that something more explicit, say through an ENABLE_CAP?
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