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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2018-03-05 12:04:40 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-03-16 22:01:36 +0100 |
| commit | b4d185175bc13d238d96998b1dba5ddeb7c69d71 (patch) | |
| tree | 433bd4f5e36f64db6f3727e2e7f1d19f2dd4959d /arch/x86 | |
| parent | 5dc1f044a32d52266c5dd44532d4fcf88dbf8ad9 (diff) | |
| download | linux-stable-b4d185175bc13d238d96998b1dba5ddeb7c69d71.tar.gz linux-stable-b4d185175bc13d238d96998b1dba5ddeb7c69d71.tar.bz2 linux-stable-b4d185175bc13d238d96998b1dba5ddeb7c69d71.zip | |
KVM: VMX: give unrestricted guest full control of CR3
Now CR3 is not forced to a host-controlled value when paging is
disabled in an unrestricted guest, CR3 load/store exiting can be
left disabled (for an unrestricted guest). And because CR0.WP
and CR4.PAE/PSE are also not force to host-controlled values,
all of ept_update_paging_mode_cr0() is no longer needed, i.e.
skip ept_update_paging_mode_cr0() for an unrestricted guest.
Because MOV CR3 no longer exits when paging is disabled for an
unrestricted guest, vmx_decache_cr3() must always read GUEST_CR3
from the VMCS for an unrestricted guest.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index d35e5c643091..c517e966b829 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -4314,7 +4314,7 @@ static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu) static void vmx_decache_cr3(struct kvm_vcpu *vcpu) { - if (enable_ept && is_paging(vcpu)) + if (enable_unrestricted_guest || (enable_ept && is_paging(vcpu))) vcpu->arch.cr3 = vmcs_readl(GUEST_CR3); __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail); } @@ -4451,7 +4451,7 @@ static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) } #endif - if (enable_ept) + if (enable_ept && !enable_unrestricted_guest) ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu); vmcs_writel(CR0_READ_SHADOW, cr0); |