lwn.git/drivers/kvm/mmu.c, branch v3.18.25

KVM: Move arch dependent files to new directory arch/x86/kvm/

2008-01-30T16:01:18+00:00

This paves the way for multiple architecture support. Note that while ioapic.c could potentially be shared with ia64, it is also moved. Signed-off-by: Avi Kivity

KVM: Portability: Move mmu-related fields to kvm_arch

2008-01-30T15:58:10+00:00

This patches moves mmu-related fields to kvm_arch. Signed-off-by: Zhang Xiantao Acked-by: Carsten Otte Signed-off-by: Avi Kivity

KVM: Portability: Split mmu-related static inline functions to mmu.h

2008-01-30T15:58:09+00:00

Since these functions need to know the details of kvm or kvm_vcpu structure, it can't be put in x86.h. Create mmu.h to hold them. Signed-off-by: Zhang Xiantao Acked-by: Carsten Otte Signed-off-by: Avi Kivity

KVM: Portability: Introduce kvm_vcpu_arch

2008-01-30T15:58:09+00:00

Move all the architecture-specific fields in kvm_vcpu into a new struct kvm_vcpu_arch. Signed-off-by: Zhang Xiantao Acked-by: Carsten Otte Signed-off-by: Avi Kivity

KVM: MMU: Fix SMP shadow instantiation race

2008-01-30T15:53:21+00:00

There is a race where VCPU0 is shadowing a pagetable entry while VCPU1 is updating it, which results in a stale shadow copy. Fix that by comparing the contents of the cached guest pte with the current guest pte after write-protecting the guest pagetable. Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity

KVM: MMU: Use mmu_set_spte() for real-mode shadows

2008-01-30T15:53:21+00:00

In addition to removing some duplicated code, this also handles the unlikely case of real-mode code updating a guest page table. This can happen when one vcpu (in real mode) touches a second vcpu's (in protected mode) page tables, or if a vcpu switches to real mode, touches page tables, and switches back. Signed-off-by: Avi Kivity

KVM: MMU: Adjust mmu_set_spte() debug code for gpte removal

2008-01-30T15:53:21+00:00

Signed-off-by: Avi Kivity

KVM: MMU: Move set_pte() into guest paging mode independent code

2008-01-30T15:53:21+00:00

As set_pte() no longer references either a gpte or the guest walker, we can move it out of paging mode dependent code (which compiles twice and is generally nasty). Signed-off-by: Avi Kivity

KVM: MMU: Fix inherited permissions for emulated guest pte updates

2008-01-30T15:53:20+00:00

When we emulate a guest pte write, we fail to apply the correct inherited permissions from the parent ptes. Now that we store inherited permissions in the shadow page, we can use that to update the pte permissions correctly. Signed-off-by: Avi Kivity

KVM: MMU: Simplify calculation of pte access

2008-01-30T15:53:20+00:00

The nx bit is awkwardly placed in the 63rd bit position; furthermore it has a reversed meaning compared to the other bits, which means we can't use a bitwise and to calculate compounded access masks. So, we simplify things by creating a new 3-bit exec/write/user access word, and doing all calculations in that. Signed-off-by: Avi Kivity