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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v17 05/10] x86: dynamically attach/detach CMT service for a guest
On 29/09/14 11:40, Chao Peng wrote:
> Add hypervisor side support for dynamically attach and detach
> Cache Monitoring Technology(CMT) services for a certain guest.
>
> When attach CMT service for a guest, system will allocate an
> RMID for it. When detach or guest is shutdown, the RMID will be
> recycled for future use.
>
> Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
> Signed-off-by: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> xen/arch/x86/domain.c | 3 +++
> xen/arch/x86/domctl.c | 29 ++++++++++++++++++++++++++
> xen/arch/x86/psr.c | 46
> ++++++++++++++++++++++++++++++++++++++++++
> xen/include/asm-x86/domain.h | 2 ++
> xen/include/asm-x86/psr.h | 10 +++++++++
> xen/include/public/domctl.h | 12 +++++++++++
> 6 files changed, 102 insertions(+)
>
> diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
> index 7b1dfe6..3cfd8f4 100644
> --- a/xen/arch/x86/domain.c
> +++ b/xen/arch/x86/domain.c
> @@ -60,6 +60,7 @@
> #include <xen/numa.h>
> #include <xen/iommu.h>
> #include <compat/vcpu.h>
> +#include <asm/psr.h>
>
> DEFINE_PER_CPU(struct vcpu *, curr_vcpu);
> DEFINE_PER_CPU(unsigned long, cr4);
> @@ -647,6 +648,8 @@ void arch_domain_destroy(struct domain *d)
>
> free_xenheap_page(d->shared_info);
> cleanup_domain_irq_mapping(d);
> +
> + psr_free_rmid(d);
> }
>
> unsigned long pv_guest_cr4_fixup(const struct vcpu *v, unsigned long
> guest_cr4)
> diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
> index 7a5de43..6ed480a 100644
> --- a/xen/arch/x86/domctl.c
> +++ b/xen/arch/x86/domctl.c
> @@ -35,6 +35,7 @@
> #include <asm/mem_sharing.h>
> #include <asm/xstate.h>
> #include <asm/debugger.h>
> +#include <asm/psr.h>
>
> static int gdbsx_guest_mem_io(
> domid_t domid, struct xen_domctl_gdbsx_memio *iop)
> @@ -1319,6 +1320,34 @@ long arch_do_domctl(
> }
> break;
>
> + case XEN_DOMCTL_psr_cmt_op:
> + if ( !psr_cmt_enabled() )
> + {
> + ret = -ENODEV;
> + break;
> + }
> +
> + switch ( domctl->u.psr_cmt_op.cmd )
> + {
> + case XEN_DOMCTL_PSR_CMT_OP_ATTACH:
> + ret = psr_alloc_rmid(d);
> + break;
> + case XEN_DOMCTL_PSR_CMT_OP_DETACH:
> + if ( d->arch.psr_rmid > 0 )
> + psr_free_rmid(d);
> + else
> + ret = -ENOENT;
> + break;
> + case XEN_DOMCTL_PSR_CMT_OP_QUERY_RMID:
> + domctl->u.psr_cmt_op.data = d->arch.psr_rmid;
> + copyback = 1;
> + break;
> + default:
> + ret = -ENOSYS;
> + break;
> + }
> + break;
> +
> default:
> ret = iommu_do_domctl(domctl, d, u_domctl);
> break;
> diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
> index a4cbc0a..4b4a4cf 100644
> --- a/xen/arch/x86/psr.c
> +++ b/xen/arch/x86/psr.c
> @@ -15,6 +15,7 @@
> */
> #include <xen/init.h>
> #include <xen/cpu.h>
> +#include <xen/sched.h>
> #include <asm/psr.h>
>
> #define PSR_CMT (1<<0)
> @@ -103,6 +104,51 @@ static int __init init_psr(void)
> }
> __initcall(init_psr);
>
> +/* Called with domain lock held, no psr specific lock needed */
> +int psr_alloc_rmid(struct domain *d)
> +{
> + unsigned int rmid;
> +
> + ASSERT(psr_cmt_enabled());
> +
> + if ( d->arch.psr_rmid > 0 )
> + return -EEXIST;
> +
> + for ( rmid = 1; rmid <= psr_cmt->rmid_max; rmid++ )
> + {
> + if ( psr_cmt->rmid_to_dom[rmid] != DOMID_INVALID )
> + continue;
> +
> + psr_cmt->rmid_to_dom[rmid] = d->domain_id;
> + break;
> + }
> +
> + /* No RMID available, assign RMID=0 by default. */
> + if ( rmid > psr_cmt->rmid_max )
> + {
> + d->arch.psr_rmid = 0;
> + return -EUSERS;
> + }
> +
> + d->arch.psr_rmid = rmid;
> +
> + return 0;
> +}
> +
> +/* Called with domain lock held, no psr specific lock needed */
> +void psr_free_rmid(struct domain *d)
> +{
> + unsigned int rmid;
> +
> + rmid = d->arch.psr_rmid;
> + /* We do not free system reserved "RMID=0". */
> + if ( rmid == 0 )
> + return;
> +
> + psr_cmt->rmid_to_dom[rmid] = DOMID_INVALID;
> + d->arch.psr_rmid = 0;
> +}
> +
> /*
> * Local variables:
> * mode: C
> diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
> index 7abe1b3..2be1d1e 100644
> --- a/xen/include/asm-x86/domain.h
> +++ b/xen/include/asm-x86/domain.h
> @@ -314,6 +314,8 @@ struct arch_domain
> /* Shared page for notifying that explicit PIRQ EOI is required. */
> unsigned long *pirq_eoi_map;
> unsigned long pirq_eoi_map_mfn;
> +
> + unsigned int psr_rmid; /* RMID assigned to the domain for CMT */
> } __cacheline_aligned;
>
> #define has_arch_pdevs(d) (!list_empty(&(d)->arch.pdev_list))
> diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h
> index 8a3803c..98cfa6d 100644
> --- a/xen/include/asm-x86/psr.h
> +++ b/xen/include/asm-x86/psr.h
> @@ -16,6 +16,8 @@
> #ifndef __ASM_PSR_H__
> #define __ASM_PSR_H__
>
> +#include <xen/types.h>
> +
> /* Resource Type Enumeration */
> #define PSR_RESOURCE_TYPE_L3 0x2
>
> @@ -38,6 +40,14 @@ struct psr_cmt {
>
> extern struct psr_cmt *psr_cmt;
>
> +static inline bool_t psr_cmt_enabled(void)
> +{
> + return !!psr_cmt;
> +}
> +
> +int psr_alloc_rmid(struct domain *d);
> +void psr_free_rmid(struct domain *d);
> +
> #endif /* __ASM_PSR_H__ */
>
> /*
> diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
> index cfa39b3..59220ed 100644
> --- a/xen/include/public/domctl.h
> +++ b/xen/include/public/domctl.h
> @@ -965,6 +965,16 @@ struct xen_domctl_vnuma {
> typedef struct xen_domctl_vnuma xen_domctl_vnuma_t;
> DEFINE_XEN_GUEST_HANDLE(xen_domctl_vnuma_t);
>
> +struct xen_domctl_psr_cmt_op {
> +#define XEN_DOMCTL_PSR_CMT_OP_DETACH 0
> +#define XEN_DOMCTL_PSR_CMT_OP_ATTACH 1
> +#define XEN_DOMCTL_PSR_CMT_OP_QUERY_RMID 2
> + uint32_t cmd;
> + uint32_t data;
> +};
> +typedef struct xen_domctl_psr_cmt_op xen_domctl_psr_cmt_op_t;
> +DEFINE_XEN_GUEST_HANDLE(xen_domctl_psr_cmt_op_t);
> +
> struct xen_domctl {
> uint32_t cmd;
> #define XEN_DOMCTL_createdomain 1
> @@ -1038,6 +1048,7 @@ struct xen_domctl {
> #define XEN_DOMCTL_get_vcpu_msrs 72
> #define XEN_DOMCTL_set_vcpu_msrs 73
> #define XEN_DOMCTL_setvnumainfo 74
> +#define XEN_DOMCTL_psr_cmt_op 75
> #define XEN_DOMCTL_gdbsx_guestmemio 1000
> #define XEN_DOMCTL_gdbsx_pausevcpu 1001
> #define XEN_DOMCTL_gdbsx_unpausevcpu 1002
> @@ -1099,6 +1110,7 @@ struct xen_domctl {
> struct xen_domctl_gdbsx_pauseunp_vcpu gdbsx_pauseunp_vcpu;
> struct xen_domctl_gdbsx_domstatus gdbsx_domstatus;
> struct xen_domctl_vnuma vnuma;
> + struct xen_domctl_psr_cmt_op psr_cmt_op;
> uint8_t pad[128];
> } u;
> };
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