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  1. 22 10月, 2020 30 次提交
  3. 20 10月, 2020 1 次提交
  5. 03 10月, 2020 1 次提交
  7. 29 9月, 2020 1 次提交
  9. 28 9月, 2020 7 次提交
    • P
      KVM: x86: do not attempt TSC synchronization on guest writes · 0c899c25
      由 Paolo Bonzini 提交于 
      KVM special-cases writes to MSR_IA32_TSC so that all CPUs have
the same base for the TSC.  This logic is complicated, and we
do not want it to have any effect once the VM is started.

In particular, if any guest started to synchronize its TSCs
with writes to MSR_IA32_TSC rather than MSR_IA32_TSC_ADJUST,
the additional effect of kvm_write_tsc code would be uncharted
territory.

Therefore, this patch makes writes to MSR_IA32_TSC behave
essentially the same as writes to MSR_IA32_TSC_ADJUST when
they come from the guest.  A new selftest (which passes
both before and after the patch) checks the current semantics
of writes to MSR_IA32_TSC and MSR_IA32_TSC_ADJUST originating
from both the host and the guest.

Upcoming work to remove the special side effects
of host-initiated writes to MSR_IA32_TSC and MSR_IA32_TSC_ADJUST
will be able to build onto this test, adjusting the host side
to use the new APIs and achieve the same effect.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      0c899c25
    • P
      KVM: nSVM: delay MSR permission processing to first nested VM run · a7d5c7ce
      由 Paolo Bonzini 提交于 
      Allow userspace to set up the memory map after KVM_SET_NESTED_STATE;
to do so, move the call to nested_svm_vmrun_msrpm inside the
KVM_REQ_GET_NESTED_STATE_PAGES handler (which is currently
not used by nSVM).  This is similar to what VMX does already.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      a7d5c7ce
    • P
      KVM: x86: rename KVM_REQ_GET_VMCS12_PAGES · 729c15c2
      由 Paolo Bonzini 提交于 
      We are going to use it for SVM too, so use a more generic name.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      729c15c2
    • A
      KVM: x86: Introduce MSR filtering · 1a155254
      由 Alexander Graf 提交于 
      It's not desireable to have all MSRs always handled by KVM kernel space. Some
MSRs would be useful to handle in user space to either emulate behavior (like
uCode updates) or differentiate whether they are valid based on the CPU model.

To allow user space to specify which MSRs it wants to see handled by KVM,
this patch introduces a new ioctl to push filter rules with bitmaps into
KVM. Based on these bitmaps, KVM can then decide whether to reject MSR access.
With the addition of KVM_CAP_X86_USER_SPACE_MSR it can also deflect the
denied MSR events to user space to operate on.

If no filter is populated, MSR handling stays identical to before.
Signed-off-by: NAlexander Graf <graf@amazon.com>

Message-Id: <20200925143422.21718-8-graf@amazon.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      1a155254
    • A
      KVM: x86: VMX: Prevent MSR passthrough when MSR access is denied · 3eb90017
      由 Alexander Graf 提交于 
      We will introduce the concept of MSRs that may not be handled in kernel
space soon. Some MSRs are directly passed through to the guest, effectively
making them handled by KVM from user space's point of view.

This patch introduces all logic required to ensure that MSRs that
user space wants trapped are not marked as direct access for guests.
Signed-off-by: NAlexander Graf <graf@amazon.com>
Message-Id: <20200925143422.21718-7-graf@amazon.com>
[Replace "_idx" with "_slot". - Paolo]
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      3eb90017
    • A
      KVM: x86: SVM: Prevent MSR passthrough when MSR access is denied · fd6fa73d
      由 Alexander Graf 提交于 
      We will introduce the concept of MSRs that may not be handled in kernel
space soon. Some MSRs are directly passed through to the guest, effectively
making them handled by KVM from user space's point of view.

This patch introduces all logic required to ensure that MSRs that
user space wants trapped are not marked as direct access for guests.
Signed-off-by: NAlexander Graf <graf@amazon.com>
Message-Id: <20200925143422.21718-6-graf@amazon.com>
[Make terminology a bit more similar to VMX. - Paolo]
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      fd6fa73d
    • A
      KVM: x86: Prepare MSR bitmaps for userspace tracked MSRs · 476c9bd8
      由 Aaron Lewis 提交于 
      Prepare vmx and svm for a subsequent change that ensures the MSR permission
bitmap is set to allow an MSR that userspace is tracking to force a vmx_vmexit
in the guest.
Signed-off-by: NAaron Lewis <aaronlewis@google.com>
Reviewed-by: NOliver Upton <oupton@google.com>
[agraf: rebase, adapt SVM scheme to nested changes that came in between]
Signed-off-by: NAlexander Graf <graf@amazon.com>
Message-Id: <20200925143422.21718-5-graf@amazon.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      476c9bd8