6a8d4ca8 | 28-Feb-2022 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Map paste address only if window is active
The paste address mapping is done with mmap() after the window is opened with ioctl. The partition has to close VAS windows in the hypervisor
powerpc/vas: Map paste address only if window is active
The paste address mapping is done with mmap() after the window is opened with ioctl. The partition has to close VAS windows in the hypervisor if it lost credits due to DLPAR core removal. But the kernel marks these windows inactive until the previously lost credits are available later. If the window is inactive due to DLPAR after this mmap(), the paste instruction returns failure until the the OS reopens this window again.
Before the user space issuing mmap(), there is a possibility of happening DLPAR core removal event which causes the corresponding window inactive. So if the window is not active, return mmap() failure with -EACCES and expects the user space reissue mmap() when the window is active or open a new window when the credit is available.
Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/bbb203c26b324534e25658cb1dbbcb5160a2f93a.camel@linux.ibm.com
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b5c63d90 | 28-Feb-2022 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Return paste instruction failure if no active window
The VAS window may not be active if the system looses credits and the NX generates page fault when it receives request on unmap past
powerpc/vas: Return paste instruction failure if no active window
The VAS window may not be active if the system looses credits and the NX generates page fault when it receives request on unmap paste address.
The kernel handles the fault by remap new paste address if the window is active again, Otherwise return the paste instruction failure if the executed instruction that caused the fault was a paste.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Haren Myneni <haren@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/492b9aefd593061d51dda67ee4d2fc449c000dce.camel@linux.ibm.com
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3b267973 | 17-Jun-2021 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Move update_csb/dump_crb to common book3s platform
If a coprocessor encounters an error translating an address, the VAS will cause an interrupt in the host. The kernel processes the fau
powerpc/vas: Move update_csb/dump_crb to common book3s platform
If a coprocessor encounters an error translating an address, the VAS will cause an interrupt in the host. The kernel processes the fault by updating CSB. This functionality is same for both powerNV and pseries. So this patch moves these functions to common vas-api.c and the actual functionality is not changed.
Signed-off-by: Haren Myneni <haren@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/bf8d5b0770fa1ef5cba88c96580caa08d999d3b5.camel@linux.ibm.com
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1a0d0d5e | 17-Jun-2021 |
Haren Myneni <haren@linux.ibm.com> |
powerpc/vas: Add platform specific user window operations
PowerNV uses registers to open/close VAS windows, and getting the paste address. Whereas the hypervisor calls are used on PowerVM.
This pat
powerpc/vas: Add platform specific user window operations
PowerNV uses registers to open/close VAS windows, and getting the paste address. Whereas the hypervisor calls are used on PowerVM.
This patch adds the platform specific user space window operations and register with the common VAS user space interface.
Signed-off-by: Haren Myneni <haren@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/f85091f4ace67f951ac04d60394d67b21e2f5d3c.camel@linux.ibm.com
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