On 2015-04-21 14:21, Radim Krčmář wrote: > 2015-04-21 13:09+0200, Paolo Bonzini: >> >> >> On 20/04/2015 19:25, Jan Kiszka wrote: >>> When hardware supports the g_pat VMCB field, we can use it for emulating >>> the PAT configuration that the guest configures by writing to the >>> corresponding MSR. >>> >>> Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> >> >> I'm not sure about this. The problem is that, unlike Intel, AMD has no >> way for the host to force its PAT value and ignore the guest's. I'm >> worried about potential performance problems in the guest. > > We already set g_pat to 0x0007040600070406ULL in init_vmcb(). > This patch uses caching that the guest expects, which might improve > performance as well. I think it's a step in right direction even if we > somehow optimize cache coherent cases later. This topic is still open - and the patch still applies. Jan
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