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KVM: nVMX: allow tests to use bad virtual-APIC page address 

As mentioned in the comment, there are some special cases where we can simply
clear the TPR shadow bit from the CPU-based execution controls in the vmcs02.
Handle them so that we can remove some XFAILs from vmx.flat.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-04-15 15:16:17 +02:00
parent cfd32acf78
commit 690908104e
3 changed files with 19 additions and 10 deletions
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25
arch/x86/kvm/vmx/nested.c
View File

@ -2873,20 +2873,27 @@ static void nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
/*
* If translation failed, VM entry will fail because
* prepare_vmcs02 set VIRTUAL_APIC_PAGE_ADDR to -1ull.
* Failing the vm entry is _not_ what the processor
* does but it's basically the only possibility we
* have. We could still enter the guest if CR8 load
* exits are enabled, CR8 store exits are enabled, and
* virtualize APIC access is disabled; in this case
* the processor would never use the TPR shadow and we
* could simply clear the bit from the execution
* control. But such a configuration is useless, so
* let's keep the code simple.
*/
if (!is_error_page(page)) {
vmx->nested.virtual_apic_page = page;
hpa = page_to_phys(vmx->nested.virtual_apic_page);
vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, hpa);
} else if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING) &&
nested_cpu_has(vmcs12, CPU_BASED_CR8_STORE_EXITING) &&
!nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
/*
* The processor will never use the TPR shadow, simply
* clear the bit from the execution control. Such a
* configuration is useless, but it happens in tests.
* For any other configuration, failing the vm entry is
* _not_ what the processor does but it's basically the
* only possibility we have.
*/
vmcs_clear_bits(CPU_BASED_VM_EXEC_CONTROL,
CPU_BASED_TPR_SHADOW);
} else {
printk("bad virtual-APIC page address\n");
dump_vmcs();
}
}

2
arch/x86/kvm/vmx/vmx.c
View File

@ -5603,7 +5603,7 @@ static void vmx_dump_dtsel(char *name, uint32_t limit)
vmcs_readl(limit + GUEST_GDTR_BASE - GUEST_GDTR_LIMIT));
}
static void dump_vmcs(void)
void dump_vmcs(void)
{
u32 vmentry_ctl = vmcs_read32(VM_ENTRY_CONTROLS);
u32 vmexit_ctl = vmcs_read32(VM_EXIT_CONTROLS);

2
arch/x86/kvm/vmx/vmx.h
View File

@ -517,4 +517,6 @@ static inline void decache_tsc_multiplier(struct vcpu_vmx *vmx)
vmcs_write64(TSC_MULTIPLIER, vmx->current_tsc_ratio);
}
void dump_vmcs(void);
#endif /* __KVM_X86_VMX_H */