[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v7 07/17] vmx: Initialize VT-d Posted-Interrupts Descriptor
This patch initializes the VT-d Posted-interrupt Descriptor. CC: Kevin Tian <kevin.tian@xxxxxxxxx> CC: Keir Fraser <keir@xxxxxxx> CC: Jan Beulich <jbeulich@xxxxxxxx> CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Signed-off-by: Feng Wu <feng.wu@xxxxxxxxx> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> --- v7: - Add comments to function 'pi_desc_init' to clarify why we update the posted-interrupt descriptor in non-atomical way in it. v3: - Move pi_desc_init() to xen/arch/x86/hvm/vmx/vmcs.c - Remove the 'inline' flag of pi_desc_init() xen/arch/x86/hvm/vmx/vmcs.c | 22 ++++++++++++++++++++++ xen/include/asm-x86/hvm/vmx/vmx.h | 2 ++ 2 files changed, 24 insertions(+) diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c index a0a97e7..5f67797 100644 --- a/xen/arch/x86/hvm/vmx/vmcs.c +++ b/xen/arch/x86/hvm/vmx/vmcs.c @@ -39,6 +39,7 @@ #include <asm/flushtlb.h> #include <asm/shadow.h> #include <asm/tboot.h> +#include <asm/apic.h> static bool_t __read_mostly opt_vpid_enabled = 1; boolean_param("vpid", opt_vpid_enabled); @@ -951,6 +952,24 @@ void virtual_vmcs_vmwrite(void *vvmcs, u32 vmcs_encoding, u64 val) virtual_vmcs_exit(vvmcs); } +/* + * This function is only called in a vCPU's initialization phase, + * so we can update the posted-interrupt descriptor in non-atomic way. + */ +static void pi_desc_init(struct vcpu *v) +{ + uint32_t dest; + + v->arch.hvm_vmx.pi_desc.nv = posted_intr_vector; + + dest = cpu_physical_id(v->processor); + + if ( x2apic_enabled ) + v->arch.hvm_vmx.pi_desc.ndst = dest; + else + v->arch.hvm_vmx.pi_desc.ndst = MASK_INSR(dest, PI_xAPIC_NDST_MASK); +} + static int construct_vmcs(struct vcpu *v) { struct domain *d = v->domain; @@ -1089,6 +1108,9 @@ static int construct_vmcs(struct vcpu *v) if ( cpu_has_vmx_posted_intr_processing ) { + if ( iommu_intpost ) + pi_desc_init(v); + __vmwrite(PI_DESC_ADDR, virt_to_maddr(&v->arch.hvm_vmx.pi_desc)); __vmwrite(POSTED_INTR_NOTIFICATION_VECTOR, posted_intr_vector); } diff --git a/xen/include/asm-x86/hvm/vmx/vmx.h b/xen/include/asm-x86/hvm/vmx/vmx.h index 8d91110..70b254f 100644 --- a/xen/include/asm-x86/hvm/vmx/vmx.h +++ b/xen/include/asm-x86/hvm/vmx/vmx.h @@ -88,6 +88,8 @@ typedef enum { #define EPT_EMT_WB 6 #define EPT_EMT_RSV2 7 +#define PI_xAPIC_NDST_MASK 0xFF00 + void vmx_asm_vmexit_handler(struct cpu_user_regs); void vmx_asm_do_vmentry(void); void vmx_intr_assist(void); -- 2.1.0 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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