[PATCH 5.15 061/107] KVM: x86: Mask off unsupported and unknown bits of IA32_ARCH_CAPABILITIES

Greg Kroah-Hartman
2022-09-06T13:53:30Z

From: Jim Mattson <jmattson@google.com>

[ Upstream commit 0204750bd4c6ccc2fb7417618477f10373b33f56 ]

KVM should not claim to virtualize unknown IA32_ARCH_CAPABILITIES
bits. When kvm_get_arch_capabilities() was originally written, there
were only a few bits defined in this MSR, and KVM could virtualize all
of them. However, over the years, several bits have been defined that
KVM cannot just blindly pass through to the guest without additional
work (such as virtualizing an MSR promised by the
IA32_ARCH_CAPABILITES feature bit).

Define a mask of supported IA32_ARCH_CAPABILITIES bits, and mask off
any other bits that are set in the hardware MSR.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Fixes: 5b76a3cff011 ("KVM: VMX: Tell the nested hypervisor to skip L1D flush on vmentry")
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-Id: <20220830174947.2182144-1-jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/kvm/x86.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f5b7a05530eb0..9109e5589b421 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1465,12 +1465,32 @@ static const u32 msr_based_features_all[] = {
static u32 msr_based_features[ARRAY_SIZE(msr_based_features_all)];
static unsigned int num_msr_based_features;

+/*
+ * Some IA32_ARCH_CAPABILITIES bits have dependencies on MSRs that KVM
+ * does not yet virtualize. These include:
+ * 10 - MISC_PACKAGE_CTRLS
+ * 11 - ENERGY_FILTERING_CTL
+ * 12 - DOITM
+ * 18 - FB_CLEAR_CTRL
+ * 21 - XAPIC_DISABLE_STATUS
+ * 23 - OVERCLOCKING_STATUS
+ */
+
+#define KVM_SUPPORTED_ARCH_CAP \
+ (ARCH_CAP_RDCL_NO | ARCH_CAP_IBRS_ALL | ARCH_CAP_RSBA | \
+ ARCH_CAP_SKIP_VMENTRY_L1DFLUSH | ARCH_CAP_SSB_NO | ARCH_CAP_MDS_NO | \
+ ARCH_CAP_PSCHANGE_MC_NO | ARCH_CAP_TSX_CTRL_MSR | ARCH_CAP_TAA_NO | \
+ ARCH_CAP_SBDR_SSDP_NO | ARCH_CAP_FBSDP_NO | ARCH_CAP_PSDP_NO | \
+ ARCH_CAP_FB_CLEAR | ARCH_CAP_RRSBA | ARCH_CAP_PBRSB_NO)
+
static u64 kvm_get_arch_capabilities(void)
{
u64 data = 0;

- if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES))
+ if (boot_cpu_has(X86_FEATURE_ARCH_CAPABILITIES)) {
rdmsrl(MSR_IA32_ARCH_CAPABILITIES, data);
+ data &= KVM_SUPPORTED_ARCH_CAP;
+ }

/*
* If nx_huge_pages is enabled, KVM's shadow paging will ensure that
@@ -1518,9 +1538,6 @@ static u64 kvm_get_arch_capabilities(void)
*/
}

- /* Guests don't need to know "Fill buffer clear control" exists */
- data &= ~ARCH_CAP_FB_CLEAR_CTRL;
-
return data;
}

--
2.35.1