On Thursday 03 June 2010 17:45:22 Gui Jianfeng wrote:
> According to SDM, we need check whether single-context INVVPID type is
> supported before issuing invvpid instruction.
>
> Signed-off-by: Gui Jianfeng <guijianfeng@xxxxxxxxxxxxxx>
> ---
> arch/x86/include/asm/vmx.h | 2 ++
> arch/x86/kvm/vmx.c | 14 +++++++++++++-
> 2 files changed, 15 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
> index 104cf86..4e78b25 100644
> --- a/arch/x86/include/asm/vmx.h
> +++ b/arch/x86/include/asm/vmx.h
> @@ -376,6 +376,8 @@ enum vmcs_field {
> #define VMX_EPT_EXTENT_CONTEXT_BIT (1ull << 25)
> #define VMX_EPT_EXTENT_GLOBAL_BIT (1ull << 26)
>
> +#define VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT (1ull << 9)
> +
> #define VMX_EPT_DEFAULT_GAW 3
> #define VMX_EPT_MAX_GAW 0x4
> #define VMX_EPT_MT_EPTE_SHIFT 3
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 0e561a5..f363fe3 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -355,6 +355,17 @@ static inline bool cpu_has_vmx_invept_global(void)
> return vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT;
> }
>
> +static inline bool cpu_has_vmx_invvpid_single(void)
> +{
> + /*
> + * bit 41 of IA32_VMX_EPT_VPID_CAP MSR indicates whehter the
> + * single-context INVVPID type is supported. vmx_capability.vpid
> + * represents the higher 32 bits of IA32_VMX_EPT_VPID_CAP MSR, so
> + * VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT(bit 9) is used here.
> + */
The comment is better with the VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT marco, since it
would also applied to other similar ones.
And I have checked my sent mail, found the word "later" maybe the reason you put
the comment here... In fact I meant something like
#define VMX_EPT_INVVPID_SINGLE_CONTEXT_BIT (1 << 9) /* (41 - 32) */
Sorry if the word caused confusing...
--
regards
Yang, Sheng
> + return vmx_capability.vpid & VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT;
> +}
> +
> static inline bool cpu_has_vmx_ept(void)
> {
> return vmcs_config.cpu_based_2nd_exec_ctrl &
> @@ -499,7 +510,8 @@ static inline void vpid_sync_vcpu_all(struct vcpu_vmx
> *vmx) if (vmx->vpid == 0)
> return;
>
> - __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
> + if (cpu_has_vmx_invvpid_single())
> + __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
> }
>
> static inline void ept_sync_global(void)
--
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