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openSUSE:Evergreen:Maintenance:114
xen.openSUSE_Evergreen_11.4
23298-hvmop-get-mem-type.patch
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File 23298-hvmop-get-mem-type.patch of Package xen.openSUSE_Evergreen_11.4
References: bnc#684297 # HG changeset patch # User Olaf Hering <olaf@aepfle.de> # Date 1304512678 -3600 # Node ID 26413986e6e06cedc2eb96c4b3c4b37f2df12125 # Parent 10f27b8b3d63959c7a8e15299a7a398b7ff7f230 x86/mm: add HVMOP_get_mem_type hvmop The balloon driver in the guest frees guest pages and marks them as mmio. When the kernel crashes and the crash kernel attempts to read the oldmem via /proc/vmcore a read from ballooned pages will generate 100% load in dom0 because Xen asks qemu-dm for the page content. Since the reads come in as 8byte requests each ballooned page is tried 512 times. Add a new hvmop HVMOP_get_mem_type to return the hvmmem_type_t for the given pfn. Pages which are neither ram or mmio will be HVMMEM_mmio_dm. This interface enables the crash kernel to skip ballooned pages. Signed-off-by: Olaf Hering <olaf@aepfle.de> Acked-by: Tim Deegan <Tim.Deegan@citrix.com> Committed-by: Tim Deegan <Tim.Deegan@citrix.com> Index: xen-4.0.3-testing/xen/arch/ia64/vmx/vmx_hypercall.c =================================================================== --- xen-4.0.3-testing.orig/xen/arch/ia64/vmx/vmx_hypercall.c +++ xen-4.0.3-testing/xen/arch/ia64/vmx/vmx_hypercall.c @@ -217,6 +217,7 @@ do_hvm_op(unsigned long op, XEN_GUEST_HA break; } + case HVMOP_get_mem_type: case HVMOP_set_mem_type: rc = -ENOSYS; break; Index: xen-4.0.3-testing/xen/arch/x86/hvm/hvm.c =================================================================== --- xen-4.0.3-testing.orig/xen/arch/x86/hvm/hvm.c +++ xen-4.0.3-testing/xen/arch/x86/hvm/hvm.c @@ -3026,6 +3026,37 @@ long do_hvm_op(unsigned long op, XEN_GUE break; } + case HVMOP_get_mem_type: + { + struct xen_hvm_get_mem_type a; + struct domain *d; + p2m_type_t t; + + if ( copy_from_guest(&a, arg, 1) ) + return -EFAULT; + + rc = rcu_lock_target_domain_by_id(a.domid, &d); + if ( rc != 0 ) + return rc; + + rc = -EINVAL; + if ( is_hvm_domain(d) ) + { + gfn_to_mfn_unshare(d, a.pfn, &t, 0); + if ( p2m_is_mmio(t) ) + a.mem_type = HVMMEM_mmio_dm; + else if ( p2m_is_readonly(t) ) + a.mem_type = HVMMEM_ram_ro; + else if ( p2m_is_ram(t) ) + a.mem_type = HVMMEM_ram_rw; + else + a.mem_type = HVMMEM_mmio_dm; + rc = copy_to_guest(arg, &a, 1) ? -EFAULT : 0; + } + rcu_unlock_domain(d); + break; + } + case HVMOP_set_mem_type: { struct xen_hvm_set_mem_type a; Index: xen-4.0.3-testing/xen/include/public/hvm/hvm_op.h =================================================================== --- xen-4.0.3-testing.orig/xen/include/public/hvm/hvm_op.h +++ xen-4.0.3-testing/xen/include/public/hvm/hvm_op.h @@ -75,6 +75,12 @@ DEFINE_XEN_GUEST_HANDLE(xen_hvm_set_pci_ /* Flushes all VCPU TLBs: @arg must be NULL. */ #define HVMOP_flush_tlbs 5 +typedef enum { + HVMMEM_ram_rw, /* Normal read/write guest RAM */ + HVMMEM_ram_ro, /* Read-only; writes are discarded */ + HVMMEM_mmio_dm, /* Reads and write go to the device model */ +} hvmmem_type_t; + /* Following tools-only interfaces may change in future. */ #if defined(__XEN__) || defined(__XEN_TOOLS__) @@ -108,11 +114,6 @@ typedef struct xen_hvm_modified_memory x DEFINE_XEN_GUEST_HANDLE(xen_hvm_modified_memory_t); #define HVMOP_set_mem_type 8 -typedef enum { - HVMMEM_ram_rw, /* Normal read/write guest RAM */ - HVMMEM_ram_ro, /* Read-only; writes are discarded */ - HVMMEM_mmio_dm, /* Reads and write go to the device model */ -} hvmmem_type_t; /* Notify that a region of memory is to be treated in a specific way. */ struct xen_hvm_set_mem_type { /* Domain to be updated. */ @@ -129,6 +130,20 @@ DEFINE_XEN_GUEST_HANDLE(xen_hvm_set_mem_ #endif /* defined(__XEN__) || defined(__XEN_TOOLS__) */ +#define HVMOP_get_mem_type 15 +/* Return hvmmem_type_t for the specified pfn. */ +struct xen_hvm_get_mem_type { + /* Domain to be queried. */ + domid_t domid; + /* OUT variable. */ + uint16_t mem_type; + uint16_t pad[2]; /* align next field on 8-byte boundary */ + /* IN variable. */ + uint64_t pfn; +}; +typedef struct xen_hvm_get_mem_type xen_hvm_get_mem_type_t; +DEFINE_XEN_GUEST_HANDLE(xen_hvm_get_mem_type_t); + /* Hint from PV drivers for pagetable destruction. */ #define HVMOP_pagetable_dying 9 struct xen_hvm_pagetable_dying {
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