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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH for-4.5 v9 RESEND 04/19] xen: Relocate p2m_mem_access_resume to mem_access common
Relocate p2m_mem_access_resume to common and abstract the new
p2m_mem_event_emulate_check into the p2m layer to.
Signed-off-by: Tamas K Lengyel <tklengyel@xxxxxxxxxxxxx>
---
v9: Pass the vcpu instead of the domain to emulate_check
and a small cosmetic fix.
v8: Abstract p2m_mem_event_emulate_check.
v6: Keep the comment describing the function.
v5: Style fix.
---
xen/arch/x86/mm/p2m.c | 127 ++++++++++++++++++------------------------
xen/common/mem_access.c | 28 +++++++++-
xen/common/mem_event.c | 2 +-
xen/include/asm-arm/p2m.h | 7 +++
xen/include/asm-x86/p2m.h | 7 ++-
xen/include/xen/mem_access.h | 5 ++
6 files changed, 98 insertions(+), 78 deletions(-)
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 31d0d9e..4822517 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1382,6 +1382,59 @@ static void p2m_mem_event_fill_regs(mem_event_request_t
*req)
req->x86_regs.cs_arbytes = seg.attr.bytes;
}
+void p2m_mem_event_emulate_check(struct vcpu *v, const mem_event_response_t
*rsp)
+{
+ /* Mark vcpu for skipping one instruction upon rescheduling. */
+ if ( rsp->flags & MEM_EVENT_FLAG_EMULATE )
+ {
+ xenmem_access_t access;
+ bool_t violation = 1;
+
+ if ( p2m_get_mem_access(v->domain, rsp->gfn, &access) == 0 )
+ {
+ switch ( access )
+ {
+ case XENMEM_access_n:
+ case XENMEM_access_n2rwx:
+ default:
+ violation = rsp->access_r || rsp->access_w || rsp->access_x;
+ break;
+
+ case XENMEM_access_r:
+ violation = rsp->access_w || rsp->access_x;
+ break;
+
+ case XENMEM_access_w:
+ violation = rsp->access_r || rsp->access_x;
+ break;
+
+ case XENMEM_access_x:
+ violation = rsp->access_r || rsp->access_w;
+ break;
+
+ case XENMEM_access_rx:
+ case XENMEM_access_rx2rw:
+ violation = rsp->access_w;
+ break;
+
+ case XENMEM_access_wx:
+ violation = rsp->access_r;
+ break;
+
+ case XENMEM_access_rw:
+ violation = rsp->access_x;
+ break;
+
+ case XENMEM_access_rwx:
+ violation = 0;
+ break;
+ }
+ }
+
+ v->arch.mem_event.emulate_flags = violation ? rsp->flags : 0;
+ }
+}
+
bool_t p2m_mem_access_check(paddr_t gpa, unsigned long gla,
struct npfec npfec,
mem_event_request_t **req_ptr)
@@ -1509,80 +1562,6 @@ bool_t p2m_mem_access_check(paddr_t gpa, unsigned long
gla,
return (p2ma == p2m_access_n2rwx);
}
-void p2m_mem_access_resume(struct domain *d)
-{
- mem_event_response_t rsp;
-
- /* Pull all responses off the ring */
- while( mem_event_get_response(d, &d->mem_event->access, &rsp) )
- {
- struct vcpu *v;
-
- if ( rsp.flags & MEM_EVENT_FLAG_DUMMY )
- continue;
-
- /* Validate the vcpu_id in the response. */
- if ( (rsp.vcpu_id >= d->max_vcpus) || !d->vcpu[rsp.vcpu_id] )
- continue;
-
- v = d->vcpu[rsp.vcpu_id];
-
- /* Mark vcpu for skipping one instruction upon rescheduling. */
- if ( rsp.flags & MEM_EVENT_FLAG_EMULATE )
- {
- xenmem_access_t access;
- bool_t violation = 1;
-
- if ( p2m_get_mem_access(d, rsp.gfn, &access) == 0 )
- {
- switch ( access )
- {
- case XENMEM_access_n:
- case XENMEM_access_n2rwx:
- default:
- violation = rsp.access_r || rsp.access_w || rsp.access_x;
- break;
-
- case XENMEM_access_r:
- violation = rsp.access_w || rsp.access_x;
- break;
-
- case XENMEM_access_w:
- violation = rsp.access_r || rsp.access_x;
- break;
-
- case XENMEM_access_x:
- violation = rsp.access_r || rsp.access_w;
- break;
-
- case XENMEM_access_rx:
- case XENMEM_access_rx2rw:
- violation = rsp.access_w;
- break;
-
- case XENMEM_access_wx:
- violation = rsp.access_r;
- break;
-
- case XENMEM_access_rw:
- violation = rsp.access_x;
- break;
-
- case XENMEM_access_rwx:
- violation = 0;
- break;
- }
- }
-
- v->arch.mem_event.emulate_flags = violation ? rsp.flags : 0;
- }
-
- /* Unpause domain */
- if ( rsp.flags & MEM_EVENT_FLAG_VCPU_PAUSED )
- mem_event_vcpu_unpause(v);
- }
-}
-
/* Set access type for a region of pfns.
* If start_pfn == -1ul, sets the default access type */
long p2m_set_mem_access(struct domain *d, unsigned long pfn, uint32_t nr,
diff --git a/xen/common/mem_access.c b/xen/common/mem_access.c
index 9a8c1a9..64e5301 100644
--- a/xen/common/mem_access.c
+++ b/xen/common/mem_access.c
@@ -29,6 +29,32 @@
#include <asm/p2m.h>
#include <xsm/xsm.h>
+void mem_access_resume(struct domain *d)
+{
+ mem_event_response_t rsp;
+
+ /* Pull all responses off the ring. */
+ while ( mem_event_get_response(d, &d->mem_event->access, &rsp) )
+ {
+ struct vcpu *v;
+
+ if ( rsp.flags & MEM_EVENT_FLAG_DUMMY )
+ continue;
+
+ /* Validate the vcpu_id in the response. */
+ if ( (rsp.vcpu_id >= d->max_vcpus) || !d->vcpu[rsp.vcpu_id] )
+ continue;
+
+ v = d->vcpu[rsp.vcpu_id];
+
+ p2m_mem_event_emulate_check(v, &rsp);
+
+ /* Unpause domain. */
+ if ( rsp.flags & MEM_EVENT_FLAG_VCPU_PAUSED )
+ mem_event_vcpu_unpause(v);
+ }
+}
+
int mem_access_memop(unsigned long cmd,
XEN_GUEST_HANDLE_PARAM(xen_mem_access_op_t) arg)
{
@@ -58,7 +84,7 @@ int mem_access_memop(unsigned long cmd,
switch ( mao.op )
{
case XENMEM_access_op_resume:
- p2m_mem_access_resume(d);
+ mem_access_resume(d);
rc = 0;
break;
diff --git a/xen/common/mem_event.c b/xen/common/mem_event.c
index 7cc99b3..9f1a1b0 100644
--- a/xen/common/mem_event.c
+++ b/xen/common/mem_event.c
@@ -439,7 +439,7 @@ static void mem_paging_notification(struct vcpu *v,
unsigned int port)
static void mem_access_notification(struct vcpu *v, unsigned int port)
{
if ( likely(v->domain->mem_event->access.ring_page != NULL) )
- p2m_mem_access_resume(v->domain);
+ mem_access_resume(v->domain);
}
#ifdef HAS_MEM_SHARING
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index faf14d3..38e32e6 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -66,6 +66,13 @@ typedef enum {
p2m_max_real_type, /* Types after this won't be store in the p2m */
} p2m_type_t;
+static inline
+void p2m_mem_event_emulate_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 a2a6289..1de493e 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -573,8 +573,6 @@ void p2m_mem_paging_resume(struct domain *d);
bool_t p2m_mem_access_check(paddr_t gpa, unsigned long gla,
struct npfec npfec,
mem_event_request_t **req_ptr);
-/* Resumes the running of the VCPU, restarting the last instruction */
-void p2m_mem_access_resume(struct domain *d);
/* Set access type for a region of pfns.
* If start_pfn == -1ul, sets the default access type */
@@ -586,6 +584,11 @@ long p2m_set_mem_access(struct domain *d, unsigned long
start_pfn, uint32_t nr,
int p2m_get_mem_access(struct domain *d, unsigned long pfn,
xenmem_access_t *access);
+/* Check for emulation and mark vcpu for skipping one instruction
+ * upon rescheduling if required. */
+void p2m_mem_event_emulate_check(struct vcpu *v,
+ const mem_event_response_t *rsp);
+
/*
* Internal functions, only called by other p2m code
*/
diff --git a/xen/include/xen/mem_access.h b/xen/include/xen/mem_access.h
index 19d1a2d..6ceb2a4 100644
--- a/xen/include/xen/mem_access.h
+++ b/xen/include/xen/mem_access.h
@@ -31,6 +31,9 @@ int mem_access_memop(unsigned long cmd,
XEN_GUEST_HANDLE_PARAM(xen_mem_access_op_t) arg);
int mem_access_send_req(struct domain *d, mem_event_request_t *req);
+/* Resumes the running of the VCPU, restarting the last instruction */
+void mem_access_resume(struct domain *d);
+
#else
static inline
@@ -46,6 +49,8 @@ int mem_access_send_req(struct domain *d, mem_event_request_t
*req)
return -ENOSYS;
}
+static inline void mem_access_resume(struct domain *d) {}
+
#endif /* HAS_MEM_ACCESS */
#endif /* _XEN_ASM_MEM_ACCESS_H */
--
1.7.10.4
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