Re: [PATCH v3] powerpc/pseries/svm: Allocate SWIOTLB buffer anywhere in memory

2020-09-17 Thread Michael Ellerman
On Tue, 18 Aug 2020 19:11:26 -0300, Thiago Jung Bauermann wrote: > POWER secure guests (i.e., guests which use the Protection Execution > Facility) need to use SWIOTLB to be able to do I/O with the hypervisor, but > they don't need the SWIOTLB memory to be in low addresses since the > hypervisor do

Re: [PATCH v3] powerpc/pseries/svm: Allocate SWIOTLB buffer anywhere in memory

2020-08-19 Thread Michael Ellerman
Christoph Hellwig writes: > On Tue, Aug 18, 2020 at 07:11:26PM -0300, Thiago Jung Bauermann wrote: >> POWER secure guests (i.e., guests which use the Protection Execution >> Facility) need to use SWIOTLB to be able to do I/O with the hypervisor, but >> they don't need the SWIOTLB memory to be in l

Re: [PATCH v3] powerpc/pseries/svm: Allocate SWIOTLB buffer anywhere in memory

2020-08-19 Thread Thiago Jung Bauermann
Konrad Rzeszutek Wilk writes: > On Tue, Aug 18, 2020 at 07:11:26PM -0300, Thiago Jung Bauermann wrote: >> POWER secure guests (i.e., guests which use the Protection Execution >> Facility) need to use SWIOTLB to be able to do I/O with the hypervisor, but >> they don't need the SWIOTLB memory to

Re: [PATCH v3] powerpc/pseries/svm: Allocate SWIOTLB buffer anywhere in memory

2020-08-19 Thread Konrad Rzeszutek Wilk
On Tue, Aug 18, 2020 at 07:11:26PM -0300, Thiago Jung Bauermann wrote: > POWER secure guests (i.e., guests which use the Protection Execution > Facility) need to use SWIOTLB to be able to do I/O with the hypervisor, but > they don't need the SWIOTLB memory to be in low addresses since the > hypervi

Re: [PATCH v3] powerpc/pseries/svm: Allocate SWIOTLB buffer anywhere in memory

2020-08-19 Thread Thiago Jung Bauermann
Christoph Hellwig writes: > On Tue, Aug 18, 2020 at 07:11:26PM -0300, Thiago Jung Bauermann wrote: >> POWER secure guests (i.e., guests which use the Protection Execution >> Facility) need to use SWIOTLB to be able to do I/O with the hypervisor, but >> they don't need the SWIOTLB memory to be i

Re: [PATCH v3] powerpc/pseries/svm: Allocate SWIOTLB buffer anywhere in memory

2020-08-18 Thread Christoph Hellwig
On Tue, Aug 18, 2020 at 07:11:26PM -0300, Thiago Jung Bauermann wrote: > POWER secure guests (i.e., guests which use the Protection Execution > Facility) need to use SWIOTLB to be able to do I/O with the hypervisor, but > they don't need the SWIOTLB memory to be in low addresses since the > hypervi

[PATCH v3] powerpc/pseries/svm: Allocate SWIOTLB buffer anywhere in memory

2020-08-18 Thread Thiago Jung Bauermann
POWER secure guests (i.e., guests which use the Protection Execution Facility) need to use SWIOTLB to be able to do I/O with the hypervisor, but they don't need the SWIOTLB memory to be in low addresses since the hypervisor doesn't have any addressing limitation. This solves a SWIOTLB initializati