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KVM: nVMX: Use macros and #defines in vmx_restore_vmx_basic()

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Use macros in vmx_restore_vmx_basic() instead of open coding everything
using BIT_ULL() and GENMASK_ULL().  Opportunistically split feature bits
and reserved bits into separate variables, and add a comment explaining
the subset logic (it's not immediately obvious that the set of feature
bits is NOT the set of _supported_ feature bits).

Cc: Shan Kang <shan.kang@intel.com>
Cc: Kai Huang <kai.huang@intel.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
[sean: split to separate patch, write changelog, drop #defines]
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20240605231918.2915961-7-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Xin Li 2024-06-05 16:19:14 -07:00 committed by Sean Christopherson
parent 9df398ff7d
commit c97b106fa8
1 changed files with 18 additions and 7 deletions
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25
arch/x86/kvm/vmx/nested.c
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@ -1251,21 +1251,32 @@ static bool is_bitwise_subset(u64 superset, u64 subset, u64 mask)
static int vmx_restore_vmx_basic(struct vcpu_vmx *vmx, u64 data)
{
const u64 feature_and_reserved =
/* feature (except bit 48; see below) */
BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55) |
/* reserved */
BIT_ULL(31) | GENMASK_ULL(47, 45) | GENMASK_ULL(63, 56);
const u64 feature_bits = VMX_BASIC_DUAL_MONITOR_TREATMENT |
VMX_BASIC_INOUT |
VMX_BASIC_TRUE_CTLS;
const u64 reserved_bits = GENMASK_ULL(63, 56) |
GENMASK_ULL(47, 45) |
BIT_ULL(31);
u64 vmx_basic = vmcs_config.nested.basic;
if (!is_bitwise_subset(vmx_basic, data, feature_and_reserved))
BUILD_BUG_ON(feature_bits & reserved_bits);
/*
* Except for 32BIT_PHYS_ADDR_ONLY, which is an anti-feature bit (has
* inverted polarity), the incoming value must not set feature bits or
* reserved bits that aren't allowed/supported by KVM. Fields, i.e.
* multi-bit values, are explicitly checked below.
*/
if (!is_bitwise_subset(vmx_basic, data, feature_bits | reserved_bits))
return -EINVAL;
/*
* KVM does not emulate a version of VMX that constrains physical
* addresses of VMX structures (e.g. VMCS) to 32-bits.
*/
if (data & BIT_ULL(48))
if (data & VMX_BASIC_32BIT_PHYS_ADDR_ONLY)
return -EINVAL;
if (vmx_basic_vmcs_revision_id(vmx_basic) !=