Messages in this thread |  | | Date | Sun, 1 May 2022 19:37:02 +0200 | Subject | Re: [PATCH] KVM: x86: work around QEMU issue with synthetic CPUID leaves | From | Paolo Bonzini <> |
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On 5/1/22 13:16, Maxim Levitsky wrote: >> + * However, only do it if the host has CPUID leaf 0x8000001d. >> + * QEMU thinks that it can query the host blindly for that >> + * CPUID leaf if KVM reports that it supports 0x8000001d or >> + * above. The processor merrily returns values from the >> + * highest Intel leaf which QEMU tries to use as the guest's >> + * 0x8000001d. Even worse, this can result in an infinite >> + * loop if said highest leaf has no subleaves indexed by ECX. > > Very small nitpick: It might be useful to add a note that qemu does this only for the > leaf 0x8000001d.
Yes, it's there: "QEMU thinks that it can query the host blindly for that CPUID leaf", "that" is 0x8000001d in the previous sentence.
Paolo
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