KVM: VMX: Truncate GPR value for DR and CR reads in !64-bit mode

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Drop bits 63:32 when storing a DR/CR to a GPR when the vCPU is not in
64-bit mode.  Per the SDM:

  The operand size for these instructions is always 32 bits in non-64-bit
  modes, regardless of the operand-size attribute.

CR8 technically isn't affected as CR8 isn't accessible outside of 64-bit
mode, but fix it up for consistency and to allow for future cleanup.

Fixes: 6aa8b732ca ("[PATCH] kvm: userspace interface")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210422022128.3464144-5-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-04-21 19:21:23 -07:00 • committed by Paolo Bonzini

parent 0884335a2e

commit d8971344f5

1 changed files with 3 additions and 3 deletions

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arch/x86/kvm/vmx/vmx.c

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