Commit c363d959 authored by David Matlack's avatar David Matlack Committed by Paolo Bonzini
Browse files

KVM: selftests: Add a helper to check EPT/VPID capabilities 



Create a small helper function to check if a given EPT/VPID capability
is supported. This will be re-used in a follow-up commit to check for 1G
page support.

No functional change intended.

Reviewed-by: default avatarPeter Xu <peterx@redhat.com>
Signed-off-by: default avatarDavid Matlack <dmatlack@google.com>
Message-Id: <20220520233249.3776001-7-dmatlack@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent b6c086d0

tools/testing/selftests/kvm/lib/x86_64/vmx.c

+6 −1
Original line number Diff line number Diff line
@@ -198,6 +198,11 @@ bool load_vmcs(struct vmx_pages *vmx) 
	return true;

}



static bool ept_vpid_cap_supported(uint64_t mask)

{

	return rdmsr(MSR_IA32_VMX_EPT_VPID_CAP) & mask;

}



/*

 * Initialize the control fields to the most basic settings possible.

 */
@@ -215,7 +220,7 @@ static inline void init_vmcs_control_fields(struct vmx_pages *vmx) 
		struct eptPageTablePointer eptp = {

			.memory_type = VMX_BASIC_MEM_TYPE_WB,

			.page_walk_length = 3, /* + 1 */

			.ad_enabled = !!(rdmsr(MSR_IA32_VMX_EPT_VPID_CAP) & VMX_EPT_VPID_CAP_AD_BITS),

			.ad_enabled = ept_vpid_cap_supported(VMX_EPT_VPID_CAP_AD_BITS),

			.address = vmx->eptp_gpa >> PAGE_SHIFT_4K,

		};