[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2 08/12] x86/altp2m: alternate p2m memory events.
Add a flag to indicate that a memory event occurred in an alternate p2m and a field containing the p2m index. Allow the response to switch to a different p2m using the same flag and field. Modify p2m_access_check() to handle alternate p2m's. Signed-off-by: Ed White <edmund.h.white@xxxxxxxxx> --- xen/arch/x86/mm/p2m.c | 20 +++++++++++++++++++- xen/include/asm-arm/p2m.h | 7 +++++++ xen/include/asm-x86/p2m.h | 4 ++++ xen/include/public/vm_event.h | 13 ++++++++++++- xen/include/xen/mem_access.h | 1 + 5 files changed, 43 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c index 87b4b75..389360a 100644 --- a/xen/arch/x86/mm/p2m.c +++ b/xen/arch/x86/mm/p2m.c @@ -1516,6 +1516,13 @@ void p2m_mem_access_emulate_check(struct vcpu *v, } } +void p2m_mem_access_altp2m_check(struct vcpu *v, const vm_event_response_t *rsp) +{ + if ( (rsp->flags & MEM_ACCESS_ALTERNATE_P2M) && + altp2mhvm_active(v->domain) ) + p2m_switch_vcpu_altp2m_by_id(v, rsp->u.mem_access.altp2m_idx); +} + bool_t p2m_mem_access_check(paddr_t gpa, unsigned long gla, struct npfec npfec, vm_event_request_t **req_ptr) @@ -1523,7 +1530,7 @@ bool_t p2m_mem_access_check(paddr_t gpa, unsigned long gla, struct vcpu *v = current; unsigned long gfn = gpa >> PAGE_SHIFT; struct domain *d = v->domain; - struct p2m_domain* p2m = p2m_get_hostp2m(d); + struct p2m_domain *p2m = NULL; mfn_t mfn; p2m_type_t p2mt; p2m_access_t p2ma; @@ -1531,6 +1538,11 @@ bool_t p2m_mem_access_check(paddr_t gpa, unsigned long gla, int rc; unsigned long eip = guest_cpu_user_regs()->eip; + if ( altp2mhvm_active(d) ) + p2m = p2m_get_altp2m(v); + if ( !p2m ) + p2m = p2m_get_hostp2m(d); + /* First, handle rx2rw conversion automatically. * These calls to p2m->set_entry() must succeed: we have the gfn * locked and just did a successful get_entry(). */ @@ -1637,6 +1649,12 @@ bool_t p2m_mem_access_check(paddr_t gpa, unsigned long gla, req->vcpu_id = v->vcpu_id; p2m_vm_event_fill_regs(req); + + if ( altp2mhvm_active(v->domain) ) + { + req->flags |= MEM_ACCESS_ALTERNATE_P2M; + req->u.mem_access.altp2m_idx = vcpu_altp2mhvm(v).p2midx; + } } /* Pause the current VCPU */ diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h index 63748ef..b31dd6f 100644 --- a/xen/include/asm-arm/p2m.h +++ b/xen/include/asm-arm/p2m.h @@ -109,6 +109,13 @@ void p2m_mem_access_emulate_check(struct vcpu *v, /* Not supported on ARM. */ } +static inline +void p2m_mem_access_altp2m_check(struct vcpu *v, + const mem_event_response_t *rsp) +{ + /* Not supported on ARM. */ +} + #define p2m_is_foreign(_t) ((_t) == p2m_map_foreign) #define p2m_is_ram(_t) ((_t) == p2m_ram_rw || (_t) == p2m_ram_ro) diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h index 16fd523..d84da33 100644 --- a/xen/include/asm-x86/p2m.h +++ b/xen/include/asm-x86/p2m.h @@ -762,6 +762,10 @@ bool_t p2m_find_altp2m_by_eptp(struct domain *d, uint64_t eptp, unsigned long *i /* Switch alternate p2m for a single vcpu */ bool_t p2m_switch_vcpu_altp2m_by_id(struct vcpu *v, uint16_t idx); +/* Check to see if vcpu should be switched to a different p2m. */ +void p2m_mem_access_altp2m_check(struct vcpu *v, + const vm_event_response_t *rsp); + /* * p2m type to IOMMU flags */ diff --git a/xen/include/public/vm_event.h b/xen/include/public/vm_event.h index 577e971..b492f65 100644 --- a/xen/include/public/vm_event.h +++ b/xen/include/public/vm_event.h @@ -149,13 +149,24 @@ struct vm_event_regs_x86 { * potentially having side effects (like memory mapped or port I/O) disabled. */ #define MEM_ACCESS_EMULATE_NOWRITE (1 << 7) +/* + * This flag can be set in a request or a response + * + * On a request, indicates that the event occurred in the alternate p2m specified by + * the altp2m_idx request field. + * + * On a response, indicates that the VCPU should resume in the alternate p2m specified + * by the altp2m_idx response field if possible. + */ +#define MEM_ACCESS_ALTERNATE_P2M (1 << 8) struct vm_event_mem_access { uint64_t gfn; uint64_t offset; uint64_t gla; /* if flags has MEM_ACCESS_GLA_VALID set */ uint32_t flags; /* MEM_ACCESS_* */ - uint32_t _pad; + uint16_t altp2m_idx; /* may be used during request and response */ + uint16_t _pad; }; struct vm_event_write_ctrlreg { diff --git a/xen/include/xen/mem_access.h b/xen/include/xen/mem_access.h index f60b727..4d3d5ca 100644 --- a/xen/include/xen/mem_access.h +++ b/xen/include/xen/mem_access.h @@ -36,6 +36,7 @@ static inline void mem_access_resume(struct vcpu *v, vm_event_response_t *rsp) { p2m_mem_access_emulate_check(v, rsp); + p2m_mem_access_altp2m_check(v, rsp); } #else -- 1.9.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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