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author | Binbin Wu <binbin.wu@linux.intel.com> | 2023-09-13 15:42:20 +0300 |
---|---|---|
committer | Sean Christopherson <seanjc@google.com> | 2023-11-29 04:54:07 +0300 |
commit | b39bd520a60c667a339e315ce7a3de2f7178f6e3 (patch) | |
tree | 887ae52145b28b1735a603d142066908e5e96ac8 /arch/x86/kvm/vmx/vmx.c | |
parent | 37a41847b770c722e98ace72f3851fb49b360c08 (diff) | |
download | linux-b39bd520a60c667a339e315ce7a3de2f7178f6e3.tar.xz |
KVM: x86: Untag addresses for LAM emulation where applicable
Stub in vmx_get_untagged_addr() and wire up calls from the emulator (via
get_untagged_addr()) and "direct" calls from various VM-Exit handlers in
VMX where LAM untagging is supposed to be applied. Defer implementing
the guts of vmx_get_untagged_addr() to future patches purely to make the
changes easier to consume.
LAM is active only for 64-bit linear addresses and several types of
accesses are exempted.
- Cases need to untag address (handled in get_vmx_mem_address())
Operand(s) of VMX instructions and INVPCID.
Operand(s) of SGX ENCLS.
- Cases LAM doesn't apply to (no change needed)
Operand of INVLPG.
Linear address in INVPCID descriptor.
Linear address in INVVPID descriptor.
BASEADDR specified in SECS of ECREATE.
Note:
- LAM doesn't apply to write to control registers or MSRs
- LAM masking is applied before walking page tables, i.e. the faulting
linear address in CR2 doesn't contain the metadata.
- The guest linear address saved in VMCS doesn't contain metadata.
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Chao Gao <chao.gao@intel.com>
Tested-by: Xuelian Guo <xuelian.guo@intel.com>
Link: https://lore.kernel.org/r/20230913124227.12574-10-binbin.wu@linux.intel.com
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/vmx/vmx.c')
-rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 69072e418c73..d7ff06d77720 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -8205,6 +8205,11 @@ static void vmx_vm_destroy(struct kvm *kvm) free_pages((unsigned long)kvm_vmx->pid_table, vmx_get_pid_table_order(kvm)); } +gva_t vmx_get_untagged_addr(struct kvm_vcpu *vcpu, gva_t gva, unsigned int flags) +{ + return gva; +} + static struct kvm_x86_ops vmx_x86_ops __initdata = { .name = KBUILD_MODNAME, @@ -8345,6 +8350,8 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = { .complete_emulated_msr = kvm_complete_insn_gp, .vcpu_deliver_sipi_vector = kvm_vcpu_deliver_sipi_vector, + + .get_untagged_addr = vmx_get_untagged_addr, }; static unsigned int vmx_handle_intel_pt_intr(void) |