From: Xudong Hao <xudong.hao@intel.com>
To: pbonzini@redhat.com, kvm@vger.kernel.org
Cc: Xudong Hao <xudong.hao@intel.com>
Subject: [PATCH kvm-unit-tests] x86/vmx: Skip LAM CR3 bits in 32-bit guest reserved bit tests
Date: Tue, 7 Jul 2026 07:02:40 +0000 [thread overview]
Message-ID: <20260707070240.78295-1-xudong.hao@intel.com> (raw)
According to Intel SDM 4.4.1 "Linear-Address Masking" (LAM), CR3 bits
61 (LAM_U57) and 62 (LAM_U48) are LAM control bits, not reserved. Skip
the LAM control bits in the CR3 reserved-bit loops when LAM is
supported for vmx_pae_test and vmx_pse_test.
Fixes: 55b77db1 ("vmx: add a test for 32-bit guest PAE paging PDPTEs")
Fixes: feef9d92 ("vmx: add test for 32-bit non-PAE guest")
Signed-off-by: Xudong Hao <xudong.hao@intel.com>
---
x86/vmx_tests.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index 16f8a648..2c0feca0 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -5896,6 +5896,11 @@ static void test_vmx_guest_pdptes(u64 cr3, u64 *pdpt)
}
for (b = cpuid_maxphyaddr(); b < 64; b++) {
+ /* CR3 bits 61 and 62 are LAM control bits, not reserved. */
+ if (this_cpu_has(X86_FEATURE_LAM) &&
+ (b == X86_CR3_LAM_U57_BIT || b == X86_CR3_LAM_U48_BIT))
+ continue;
+
vmx_32bit_guest_init_common(cr3 | (1ull << b), pdpt);
test_guest_state("CR3 reserved bit", true, (1ull << b), "bit");
}
@@ -5979,6 +5984,11 @@ static void vmx_pse_test(void)
}
for (b = cpuid_maxphyaddr(); b < 64; b++) {
+ /* CR3 bits 61 and 62 are LAM control bits, not reserved. */
+ if (this_cpu_has(X86_FEATURE_LAM) &&
+ (b == X86_CR3_LAM_U57_BIT || b == X86_CR3_LAM_U48_BIT))
+ continue;
+
vmx_32bit_guest_init_common(cr3 | (1ull << b), NULL);
test_guest_state("CR3 reserved bit", true, (1ull << b), "bit");
}
--
2.52.0
next reply other threads:[~2026-07-07 7:02 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-07 7:02 Xudong Hao [this message]
2026-09-02 8:54 ` [PATCH kvm-unit-tests] x86/vmx: Skip LAM CR3 bits in 32-bit guest reserved bit tests Hao, Xudong
2026-09-08 13:24 ` Paolo Bonzini
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