[ CCed Zhang Yang ]
On 06/04/2015 04:36 PM, Paolo Bonzini wrote:
On 04/06/2015 10:23, Xiao Guangrong wrote:
So, why do you need to always use IPAT=0? Can patch 15 keep the current
logic for RAM, like this:
if (is_mmio || kvm_arch_has_noncoherent_dma(vcpu-kvm))
ret =
On 04/06/2015 10:26, Xiao Guangrong wrote:
CR0.CD is always 0 in both host and guest, i guess it's why we cleared
CR0.CD and CR0.NW in vmx_set_cr0().
It reminds me that we should check guest CR0.CD before check guest MTRR
and disable guest PAT if guest CR0.CD = 1.
I think it can be done
On 06/03/2015 03:55 PM, Paolo Bonzini wrote:
On 03/06/2015 04:56, Xiao Guangrong wrote:
On 06/01/2015 05:36 PM, Paolo Bonzini wrote:
On 30/05/2015 12:59, Xiao Guangrong wrote:
Currently guest MTRR is completely prohibited if cache snoop is
supported on
IOMMU (!noncoherent_dma) and
On 04/06/2015 10:23, Xiao Guangrong wrote:
So, why do you need to always use IPAT=0? Can patch 15 keep the current
logic for RAM, like this:
if (is_mmio || kvm_arch_has_noncoherent_dma(vcpu-kvm))
ret = kvm_mtrr_get_guest_memory_type(vcpu, gfn)
On 06/04/2015 04:23 PM, Xiao Guangrong wrote:
On 06/03/2015 03:55 PM, Paolo Bonzini wrote:
On 03/06/2015 04:56, Xiao Guangrong wrote:
On 06/01/2015 05:36 PM, Paolo Bonzini wrote:
On 30/05/2015 12:59, Xiao Guangrong wrote:
Currently guest MTRR is completely prohibited if cache snoop
On 03/06/2015 04:56, Xiao Guangrong wrote:
On 06/01/2015 05:36 PM, Paolo Bonzini wrote:
On 30/05/2015 12:59, Xiao Guangrong wrote:
Currently guest MTRR is completely prohibited if cache snoop is
supported on
IOMMU (!noncoherent_dma) and host does the emulation based on the
knowledge
On 06/01/2015 05:36 PM, Paolo Bonzini wrote:
On 30/05/2015 12:59, Xiao Guangrong wrote:
Currently guest MTRR is completely prohibited if cache snoop is supported on
IOMMU (!noncoherent_dma) and host does the emulation based on the knowledge
from host side, however, host side is not the good
On 01/06/2015 11:36, Paolo Bonzini wrote:
Does this have a performance impact on shadow? Perhaps we could cache
in struct kvm_arch_memory_slot whether the memslot is covered by MTRRs?
Nevermind, patch 15 answers my question.
Paolo
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On 30/05/2015 12:59, Xiao Guangrong wrote:
Currently guest MTRR is completely prohibited if cache snoop is supported on
IOMMU (!noncoherent_dma) and host does the emulation based on the knowledge
from host side, however, host side is not the good point to know
what the purpose of guest is. A
Based on Intel's SDM, mapping huge page which do not have consistent
memory cache for each 4k page will cause undefined behavior
In order to avoiding this kind of undefined behavior, we force to use
4k pages under this case
Signed-off-by: Xiao Guangrong guangrong.x...@linux.intel.com
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