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Here is change log from V3 To V4: - Fixing spelling/grammar mistakes suggested by Randy Dunlap - Changing the hypercall interface to be able to process multiple pages per one hypercall also suggested by Randy Dunlap. It turns out that this will save lots of vmexist/memory slot flushes when protecting many pages. [PATCH RFC V4 1/3] KVM: X86: Memory ROE documentation [PATCH RFC V4 2/3] KVM:

Hi, This is my first set of patches that works as I would expect, and the third revision I sent to mailing lists. Following up with my previous discussions about kernel rootkit mitigation via placing R/O protection on critical data structure, static data, privileged registers with static content. These patches present the first part where it is only possible to place these protections on memory

Hi, This is my first set of patches that works as I would expect, and the third revision I sent to mailing lists. Following up with my previous discussions about kernel rootkit mitigation via placing R/O protection on critical data structure, static data, privileged registers with static content. These patches present the first part where it is only possible to place these protections on memory

...h/x86/kvm/mmu.c index 77661530b2c4..4ce6a9a19a23 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1416,9 +1416,8 @@ static bool spte_write_protect(u64 *sptep, bool pt_protect) return mmu_spte_update(sptep, spte); } -static bool __rmap_write_protect(struct kvm *kvm, - struct kvm_rmap_head *rmap_head, - bool pt_protect, void *data) +static bool __rmap_write_protection(struct kvm *kvm, + struct kvm_rmap_head *rmap_head, bool pt_protect) { u64 *sptep; struct rmap_iterator iter; @@ -1430,6 +1429,38 @@ static bool __rmap_write_protect(struct kvm *kvm, return flush; } +#ifd...

...h/x86/kvm/mmu.c index 77661530b2c4..4ce6a9a19a23 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1416,9 +1416,8 @@ static bool spte_write_protect(u64 *sptep, bool pt_protect) return mmu_spte_update(sptep, spte); } -static bool __rmap_write_protect(struct kvm *kvm, - struct kvm_rmap_head *rmap_head, - bool pt_protect, void *data) +static bool __rmap_write_protection(struct kvm *kvm, + struct kvm_rmap_head *rmap_head, bool pt_protect) { u64 *sptep; struct rmap_iterator iter; @@ -1430,6 +1429,38 @@ static bool __rmap_write_protect(struct kvm *kvm, return flush; } +#ifd...

...+ +static bool spte_exec_protect(u64 *sptep) +{ + u64 spte = *sptep; + + rmap_printk("rmap_exec_protect: spte %p %llx\n", sptep, *sptep); + + spte = spte & ~PT_USER_MASK; + + return mmu_spte_update(sptep, spte); +} + static bool __rmap_write_protect(struct kvm *kvm, struct kvm_rmap_head *rmap_head, bool pt_protect) @@ -1593,6 +1618,32 @@ static bool __rmap_write_protect(struct kvm *kvm, return flush; } +static bool __rmap_read_protect(struct kvm *kvm, + struct kvm_rmap_head *rmap_head) +{ + struct rmap_iterator iter; + bool flush = false; + u64 *sptep; + + for_each_r...

This patch series is based on the VM introspection patches (https://lore.kernel.org/kvm/20200721210922.7646-1-alazar at bitdefender.com/), extending the introspection API with EPT Views and Virtualization Exceptions (#VE) support. The purpose of this series is to get an initial feedback and to see if we are on the right track, especially because the changes made to add the EPT views are not small

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VM-s (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VMs (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place

The KVM introspection subsystem provides a facility for applications running on the host or in a separate VM, to control the execution of other VMs (pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.), alter the page access bits in the shadow page tables (only for the hardware backed ones, eg. Intel's EPT) and receive notifications when events of interest have taken place