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Re: [Xen-devel] [PATCH V4] x86/hvm: fix domain crash when CR3 has the noflush bit set

On 02/14/2018 05:35 PM, Tamas K Lengyel wrote:
> On Fri, Feb 9, 2018 at 4:01 AM, Razvan Cojocaru
> <rcojocaru@xxxxxxxxxxxxxxx> wrote:
>> The emulation layers of Xen lack PCID support, and as we only offer
>> PCID to HAP guests, all writes to CR3 are handled by hardware,
>> except when introspection is involved. Consequently, trying to set
>> CR3 when the noflush bit is set in hvm_set_cr3() leads to domain
>> crashes. The workaround is to clear the noflush bit in
>> hvm_set_cr3(). CR3 values in hvm_monitor_cr() are also sanitized.
>> Additionally, a bool parameter now propagates to
>> {svm,vmx}_update_guest_cr(), so that no flushes occur when
>> the bit was set.
>> Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
>> Reported-by: Bitweasil <bitweasil@xxxxxxxxxxxxxx>
>> Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Acked-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>



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