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Re: [Xen-devel] [PATCH v2] x86/hvm: separate ioreq server code from generic hvm code

On 04/01/2016 03:54 AM, Paul Durrant wrote:
The code in hvm/hvm.c related to handling I/O emulation using the ioreq
server framework is large and mostly self-contained.

This patch separates the ioreq server code into a new hvm/ioreq.c source
module and accompanying asm-x86/hvm/ioreq.h header file. There is no
intended functional change, only code movement.

This may be more than just code movement. It breaks PVH. I haven't looked at what exactly is breaking but I figured I'd give a heads-up.


(XEN) ----[ Xen-4.7-unstable  x86_64  debug=y  Tainted:    C ]----
(XEN) CPU:    2
(XEN) RIP:    e008:[<ffff82d0801dac82>] handle_hvm_io_completion+0x1bb/0x288
(XEN) RFLAGS: 0000000000010286   CONTEXT: hypervisor (d1v0)
(XEN) rax: ffff8302453b8000   rbx: ffff8300a56e3000   rcx: ffff8302453bffc0
(XEN) rdx: ffff83024da8b000   rsi: ffff82d080326280   rdi: ffff8300a56e3000
(XEN) rbp: ffff8302453bfd80   rsp: ffff8302453bfc20   r8: ffff830247180ed0
(XEN) r9:  00000000ffffff21   r10: 00000000deadbeef   r11: 0000000000000246
(XEN) r12: ffff8300a56e3000   r13: 0000000000000000   r14: ffff83024da8b250
(XEN) r15: ffff8302453f3000   cr0: 000000008005003b   cr4: 00000000001526e0
(XEN) cr3: 000000024db49000   cr2: 0000000000000000
(XEN) ds: 002b   es: 002b   fs: 0000   gs: 0000   ss: e010   cs: e008
(XEN) Xen code around <ffff82d0801dac82> (handle_hvm_io_completion+0x1bb/0x288): (XEN) 00 94 fe ff ff 4d 8b 6d <00> 8b 45 00 0f 18 08 4d 39 f5 0f 85 73 fe ff ff
(XEN) Xen stack trace from rsp=ffff8302453bfc20:
(XEN)    ffff8302453b8000 ffff8302453bfc30 0000000000000000 0000000000000000
(XEN)    0000000000000000 ffff8302453bfc88 00000000001526e0 ffff8302453bfc88
(XEN)    0000000000000046 ffff8300a573d000 0000000000000002 ffff8302453f3000
(XEN)    ffff8300a29fe000 ffff8302453bfc98 ffff82d080178ad1 ffff8302453bfcf8
(XEN)    ffff82d0801659e1 ffff8302453bff18 ffff8302453b8000 efff0002453bfcd8
(XEN)    ffff8302453a9000 0000000000000000 0000000000000046 0000000000000082
(XEN)    00000000000000fd 0000005077eb2c26 0000000000000000 ffff8302453bfd10
(XEN)    ffff82d080197ced ffff8300a56e3000 ffff8302453bfd60 00000000001526e0
(XEN)    ffff8302453bfd50 0000000000000046 ffff83009f7e7020 ffff83024da8b000
(XEN)    ffff8300a56e3000 0000000000000000 ffff8302453bfdb0 ffff8300a56e3000
(XEN)    ffff8300a573d000 ffff83024da8b000 0000000000000002 ffff8302453f3000
(XEN)    ffff8302453bfda0 ffff82d0801d4496 ffff8300a56e3000 ffff8300a573d000
(XEN)    ffff8302453bfdc0 ffff82d0801f49ee ffff8302453bfdc0 ffff8300a56e3000
(XEN)    ffff8302453bfe20 ffff82d08016a952 0000000000000000 0000000000000000
(XEN)    0000000000000000 0000000000000000 ffff8302453bfe20 ffff8300a573d000
(XEN)    000000507862cc3e ffff8300a56e3000 ffff830247180128 0000000000000001
(XEN)    ffff8302453bfeb0 ffff82d08012c50f 92dd987700000002 ffff830247180140
(XEN)    00000002003bfe60 ffff830247180120 ffff8302453bfe60 ffff82d080130034
(XEN)    ffff8302453bfeb0 ffff8300a56e3000 0000000001c9c380 ffff82d0801bed01
(XEN)    ffff8300a573d000 ffff82d080312b00 ffff82d080312a00 ffffffffffffffff
(XEN) Xen call trace:
(XEN)    [<ffff82d0801dac82>] handle_hvm_io_completion+0x1bb/0x288
(XEN)    [<ffff82d0801d4496>] hvm_do_resume+0x35/0x14b
(XEN)    [<ffff82d0801f49ee>] vmx_do_resume+0x12c/0x143
(XEN)    [<ffff82d08016a952>] context_switch+0xf4a/0xf4c
(XEN)    [<ffff82d08012c50f>] schedule.c#schedule+0x5a5/0x5d7
(XEN)    [<ffff82d08012f732>] softirq.c#__do_softirq+0x82/0x8d
(XEN)    [<ffff82d08012f78a>] do_softirq+0x13/0x15
(XEN)    [<ffff82d0801651a5>] domain.c#idle_loop+0x5e/0x6e
(XEN) Pagetable walk from 0000000000000000:
(XEN)  L4[0x000] = 0000000000000000 ffffffffffffffff
(XEN) ****************************************
(XEN) Panic on CPU 2:
(XEN) [error_code=0000]
(XEN) Faulting linear address: 0000000000000000

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