Check that PCID is actually supported before verifying that it can be set
in vmcs.HOST_CR4 for 64-bit hosts. PCID is all but ubiquitous on modern
CPUs, but PCID may be hidden by the host to workaround a TLB flushing bug
on Alderlake and Raptorlake.
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
x86/vmx_tests.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/x86/vmx_tests.c b/x86/vmx_tests.c
index 7952ccb9..226f526d 100644
--- a/x86/vmx_tests.c
+++ b/x86/vmx_tests.c
@@ -7625,10 +7625,12 @@ static void test_host_addr_size(void)
test_vmx_vmlaunch(0);
report_prefix_pop();
- vmcs_write(HOST_CR4, cr4_saved | X86_CR4_PCIDE);
- report_prefix_pushf("\"CR4.PCIDE\" set");
- test_vmx_vmlaunch(0);
- report_prefix_pop();
+ if (this_cpu_has(X86_FEATURE_PCID)) {
+ vmcs_write(HOST_CR4, cr4_saved | X86_CR4_PCIDE);
+ report_prefix_pushf("\"CR4.PCIDE\" set");
+ test_vmx_vmlaunch(0);
+ report_prefix_pop();
+ }
for (i = 32; i <= 63; i = i + 4) {
tmp = rip_saved | 1ull << i;
--
2.42.0.283.g2d96d420d3-goog
