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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-ia64-devel] Re: [PATCH] Fix mca handler so as not to destroy ar
On Tue, Aug 05, 2008 at 12:37:17PM +0900, Isaku Yamahata wrote:
>
> Hi Kazu. Sorry for late alert.
> VIRTUAL_MODE_ENTER() still refers ar.k6.
> Could you fix it?
One more.
Before pinning down vpd and vhpt, it's necessary to
make sure that they doesn't overlap with stack like __vmxswitch_rr7()
and ia64_new_rr7().
thanks,
>
>
> On Wed, Jul 30, 2008 at 01:29:39PM +0900, SUZUKI Kazuhiro wrote:
> > Hi,
> >
> > Thank you for your comments.
> > I attached an updated patch following to the comments.
> >
> > Thanks,
> > KAZ
> >
> > Signed-off-by: Kazuhiro Suzuki <kaz@xxxxxxxxxxxxxx>
> >
> >
> > From: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
> > Subject: Re: [PATCH] Fix mca handler so as not to destroy ar(was: Re:
> > [Xen-ia64-devel] Re: mca handler)
> > Date: Mon, 28 Jul 2008 11:20:05 +0900
> >
> > > On Fri, Jul 25, 2008 at 05:47:37PM +0900, SUZUKI Kazuhiro wrote:
> > > > The following patch fixes the mca handler so as not to destroy ar
> > > > and some bugs.
> > >
> > > Thank you for fixing some bugs and it looks basically good.
> > > Some comments below.
> > >
> > >
> > > > @@ -524,24 +457,111 @@ ia64_reload_tr:
> > > > srlz.d
> > > > ;;
> > > > #ifdef XEN
> > > > -.reload_vhpt:
> > > > - // 5. VHPT
> > > > - GET_THIS_PADDR(r1, inserted_vhpt);;
> > > > - cmp.eq p7,p0=r2,r0
> > > > -(p7) br.cond.sptk .overlap_vhpt // vhpt isn't mapped.
> > > > + // 5. shared_info
> > > > + GET_THIS_PADDR(r2, inserted_shared_info);;
> > > > + ld8 r16=[r2]
> > > > + mov r18=XSI_SHIFT<<2
> > > > + movl r20=__pgprot(__DIRTY_BITS | _PAGE_PL_PRIV | _PAGE_AR_RW)
> > > > + ;;
> > > > + GET_THIS_PADDR(r2, domain_shared_info);;
> > > > + ld8 r17=[r2]
> > > > + ;;
> > > > + dep r17=0,r17,60,4
> > > > + ;;
> > > > + or r17=r17,r20 // construct PA | page
> > > > properties
> > > > + mov cr.itir=r18
> > > > + mov cr.ifa=r16
> > > > + ;;
> > > > + mov r16=IA64_TR_SHARED_INFO
> > > > + ;;
> > > > + itr.d dtr[r16]=r17 // wire in new mapping...
> > > > + ;;
> > > > + srlz.d
> > > > + ;;
> > >
> > > Unconditionally pinning down shared_info into inserted_shared_info
> > > is wrong because shared_info is shared only with PV domain and xen VMM.
> > > So In VMX domain case, it shouldn't pinned down. Otherwise VMX guest
> > > wrongly accesses to shared_info.
> > > In ia64_do_tlb_purge() case, unconditionally purging
> > > DTR[IA64_TR_SHARED_INFO] is okay, but unconditionally inserting
> > > DTR[IA64_TR_SHARED_INFO] is bad.
> > >
> > > thanks,
>
> > diff -r 1970781956c7 xen/arch/ia64/linux-xen/mca_asm.S
> > --- a/xen/arch/ia64/linux-xen/mca_asm.S Wed Jul 23 12:10:20 2008 +0900
> > +++ b/xen/arch/ia64/linux-xen/mca_asm.S Wed Jul 30 11:33:51 2008 +0900
> > @@ -154,71 +154,6 @@
> > .text
> > .align 16
> >
> > -#ifdef XEN
> > -/*
> > - * void set_per_cpu_data(void)
> > - * {
> > - * int i;
> > - * for (i = 0; i < 64; i++) {
> > - * if (ia64_mca_tlb_list[i].cr_lid == ia64_getreg(_IA64_REG_CR_LID)) {
> > - * ia64_set_kr(IA64_KR_PER_CPU_DATA,
> > ia64_mca_tlb_list[i].percpu_paddr);
> > - * return;
> > - * }
> > - * }
> > - * while(1); // Endless loop on error
> > - * }
> > - */
> > -#define SET_PER_CPU_DATA() \
> > - LOAD_PHYSICAL(p0,r2,ia64_mca_tlb_list);; \
> > - mov r7 = r0; \
> > - mov r6 = r0;; \
> > - adds r3 = IA64_MCA_PERCPU_OFFSET, r2; \
> > -1: add r4 = r6, r2; \
> > - mov r5=cr.lid;; \
> > - adds r7 = 1, r7; \
> > - ld8 r4 = [r4];; \
> > - cmp.ne p6, p7 = r5, r4; \
> > - cmp4.lt p8, p9 = NR_CPUS-1, r7; \
> > -(p7) br.cond.dpnt 3f; \
> > - adds r6 = 16, r6; \
> > -(p9) br.cond.sptk 1b; \
> > -2: br 2b;; /* Endless loop on error */ \
> > -3: add r4 = r6, r3;; \
> > - ld8 r4 = [r4];; \
> > - mov ar.k3=r4
> > -
> > -/*
> > - * GET_VA_VCPU_VHPT_MADDR() emulates 'reg = __va_ul(vcpu_vhpt_maddr(v))'.
> > - */
> > -#ifdef CONFIG_XEN_IA64_PERVCPU_VHPT
> > -#define HAS_PERVCPU_VHPT_MASK 0x2
> > -#define GET_VA_VCPU_VHPT_MADDR(reg,tmp) \
> > - GET_THIS_PADDR(reg,cpu_kr);; \
> > - add reg=IA64_KR_CURRENT_OFFSET,reg;; \
> > - ld8 reg=[reg];; \
> > - dep tmp=0,reg,60,4;; /* V to P */ \
> > - add tmp=IA64_VCPU_VHPT_PAGE_OFFSET,tmp;; \
> > - ld8 tmp=[tmp];; \
> > - cmp.eq p6,p0=tmp,r0; /* v->arch.vhpt_page == NULL */ \
> > -(p6) br.cond.sptk 1f; \
> > - add reg=IA64_VCPU_VHPT_MADDR_OFFSET,reg;; \
> > - dep reg=0,reg,60,4;; /* V to P */ \
> > - ld8 reg=[reg];; \
> > - dep reg=-1,reg,60,4; /* P to V */ \
> > - br.sptk 2f; \
> > -1: \
> > - GET_THIS_PADDR(reg, vhpt_paddr);; \
> > - ld8 reg=[reg];; \
> > - dep reg=-1,reg,60,4; /* P to V */ \
> > -2:
> > -#else /* CONFIG_XEN_IA64_PERVCPU_VHPT */
> > -#define GET_VA_VCPU_VHPT_MADDR(reg,tmp) \
> > - GET_THIS_PADDR(reg, vhpt_paddr);; \
> > - ld8 reg=[reg];; \
> > - dep reg=-1,reg,60,4 /* P to V */
> > -#endif /* CONFIG_XEN_IA64_PERVCPU_VHPT */
> > -#endif /* XEN */
> > -
> > /*
> > * Just the TLB purge part is moved to a separate function
> > * so we can re-use the code for cpu hotplug code as well
> > @@ -227,10 +162,6 @@ 2:
> > */
> >
> > ia64_do_tlb_purge:
> > -#ifdef XEN
> > - // This needs to be called in order for GET_THIS_PADDR to work
> > - SET_PER_CPU_DATA();;
> > -#endif
> > #define O(member) IA64_CPUINFO_##member##_OFFSET
> >
> > GET_THIS_PADDR(r2, cpu_info) // load phys addr of cpu_info into r2
> > @@ -346,15 +277,19 @@ 4:
> > // a VMX domain hasn't been started since boot
> > GET_THIS_PADDR(r2, inserted_vpd);;
> > ld8 r16=[r2]
> > - mov r18=XMAPPEDREGS_SHIFT<<2
> > - ;;
> > - cmp.eq p7,p0=r2,r0
> > + mov r18=IA64_GRANULE_SHIFT<<2
> > + ;;
> > + cmp.eq p7,p0=r16,r0
> > ;;
> > (p7) br.cond.sptk .vpd_not_mapped
> > ;;
> > ptr.i r16,r18
> > ;;
> > + ptr.d r16,r18
> > + ;;
> > srlz.i
> > + ;;
> > + srlz.d
> > ;;
> > .vpd_not_mapped:
> >
> > @@ -362,6 +297,7 @@ 4:
> > // GET_VA_VCPU_VHPT_MADDR() may not give the
> > // value of the VHPT currently pinned into the TLB
> > GET_THIS_PADDR(r2, inserted_vhpt);;
> > + ld8 r2=[r2]
> > ;;
> > cmp.eq p7,p0=r2,r0
> > ;;
> > @@ -389,9 +325,6 @@ ia64_os_mca_spin:
> > cmp.ne p6,p0=r4,r0
> > (p6) br ia64_os_mca_spin
> >
> > -#ifdef XEN
> > - SET_PER_CPU_DATA();;
> > -#endif
> > // Save the SAL to OS MCA handoff state as defined
> > // by SAL SPEC 3.0
> > // NOTE : The order in which the state gets saved
> > @@ -524,24 +457,129 @@ ia64_reload_tr:
> > srlz.d
> > ;;
> > #ifdef XEN
> > -.reload_vhpt:
> > - // 5. VHPT
> > - GET_THIS_PADDR(r1, inserted_vhpt);;
> > - cmp.eq p7,p0=r2,r0
> > -(p7) br.cond.sptk .overlap_vhpt // vhpt isn't mapped.
> > + // if !VMX_DOMAIN(current)
> > + // pin down shared_info and mapped_regs
> > + // else
> > + // pin down VPD
> > + GET_THIS_PADDR(r2,cpu_kr);;
> > + add r2=IA64_KR_CURRENT_OFFSET,r2
> > + ;;
> > + ld8 r2=[r2]
> > + ;;
> > + dep r2=0,r2,60,4
> > + ;;
> > + add r2=IA64_VCPU_FLAGS_OFFSET,r2
> > + ;;
> > + ld8 r2=[r2]
> > + ;;
> > + cmp.eq p6,p7 = r2,r0
> > +(p7) br.cond.sptk .vmx_domain
> > +
> > + // 5. shared_info
> > + GET_THIS_PADDR(r2, inserted_shared_info);;
> > + ld8 r16=[r2]
> > + mov r18=XSI_SHIFT<<2
> > + movl r20=__pgprot(__DIRTY_BITS | _PAGE_PL_PRIV | _PAGE_AR_RW)
> > + ;;
> > + GET_THIS_PADDR(r2, domain_shared_info);;
> > + ld8 r17=[r2]
> > + ;;
> > + dep r17=0,r17,60,4
> > + ;;
> > + or r17=r17,r20 // construct PA | page properties
> > + mov cr.itir=r18
> > + mov cr.ifa=r16
> > + ;;
> > + mov r16=IA64_TR_SHARED_INFO
> > + ;;
> > + itr.d dtr[r16]=r17 // wire in new mapping...
> > + ;;
> > + srlz.d
> > + ;;
> > +
> > + // 6. mapped_regs
> > + GET_THIS_PADDR(r2, inserted_mapped_regs);;
> > + ld8 r16=[r2]
> > + mov r18=XMAPPEDREGS_SHIFT<<2
> > + ;;
> > + GET_THIS_PADDR(r2,cpu_kr);;
> > + add r2=IA64_KR_CURRENT_OFFSET,r2
> > + ;;
> > + ld8 r2=[r2]
> > + ;;
> > + dep r2=0,r2,60,4
> > + ;;
> > + add r2=IA64_VPD_BASE_OFFSET,r2
> > + ;;
> > + ld8 r17=[r2]
> > + ;;
> > + dep r17=0,r17,60,4
> > + ;;
> > + or r17=r17,r20 // construct PA | page properties
> > + mov cr.itir=r18
> > + mov cr.ifa=r16
> > + ;;
> > + mov r16=IA64_TR_MAPPED_REGS
> > + ;;
> > + itr.d dtr[r16]=r17 // wire in new mapping...
> > + ;;
> > + srlz.d
> > + ;;
> > + br.sptk.many .reload_vpd_not_mapped;;
> > +.vmx_domain:
> > +
> > + // 7. VPD
> > + GET_THIS_PADDR(r2, inserted_vpd);;
> > + ld8 r16=[r2]
> > + mov r18=IA64_GRANULE_SHIFT<<2
> > + ;;
> > + cmp.eq p7,p0=r16,r0
> > + ;;
> > +(p7) br.cond.sptk .reload_vpd_not_mapped
> > + dep r17=0,r16,60,4
> > + ;;
> > + dep r17=0,r17,0,IA64_GRANULE_SHIFT
> > + ;;
> > + movl r20=PAGE_KERNEL
> > + ;;
> > + or r17=r20,r17 // construct PA | page properties
> > + ;;
> > + mov cr.itir=r18
> > + mov cr.ifa=r16
> > + ;;
> > + mov r16=IA64_TR_VPD
> > + mov r18=IA64_TR_MAPPED_REGS
> > + ;;
> > + itr.i itr[r16]=r17
> > + ;;
> > + itr.d dtr[r18]=r17
> > + ;;
> > + srlz.i
> > + ;;
> > + srlz.d
> > + ;;
> > +.reload_vpd_not_mapped:
> > +
> > + // 8. VHPT
> > + GET_THIS_PADDR(r2, inserted_vhpt);;
> > + ld8 r2=[r2]
> > + ;;
> > + cmp.eq p7,p0=r2,r0
> > + ;;
> > +(p7) br.cond.sptk .overlap_vhpt // vhpt isn't mapped.
> >
> > // avoid overlapping with stack TR
> > - shr.u r17=r2,IA64_GRANULE_SHIFT
> > - GET_THIS_PADDR(r3, cpu_kr);;
> > - add r3=IA64_KR_CURRENT_STACK_OFFSET,r3
> > - ;;
> > - ld8 r3=[r3]
> > - ;;
> > - cmp.eq p7,p0=r3,r17
> > + dep r16=0,r2,0,IA64_GRANULE_SHIFT
> > + ;;
> > + GET_THIS_PADDR(r2,cpu_kr);;
> > + add r2=IA64_KR_CURRENT_OFFSET,r2
> > + ;;
> > + ld8 r2=[r2]
> > + ;;
> > + dep r17=0,r2,0,IA64_GRANULE_SHIFT
> > + ;;
> > + cmp.eq p7,p0=r16,r17
> > (p7) br.cond.sptk .overlap_vhpt
> > - ;;
> > -
> > - dep r16=0,r2,0,IA64_GRANULE_SHIFT
> > movl r20=PAGE_KERNEL
> > ;;
> > mov r18=IA64_TR_VHPT
> > @@ -1123,8 +1161,6 @@ GLOBAL_ENTRY(ia64_monarch_init_handler)
> > GLOBAL_ENTRY(ia64_monarch_init_handler)
> > .prologue
> > #ifdef XEN /* Need in ia64_monarch_init_handler? */
> > - SET_PER_CPU_DATA();;
> > -
> > // Set current to ar.k6
> > GET_THIS_PADDR(r2,cpu_kr);;
> > add r2=IA64_KR_CURRENT_OFFSET,r2;;
> > diff -r 1970781956c7 xen/arch/ia64/xen/regionreg.c
> > --- a/xen/arch/ia64/xen/regionreg.c Wed Jul 23 12:10:20 2008 +0900
> > +++ b/xen/arch/ia64/xen/regionreg.c Tue Jul 29 17:43:24 2008 +0900
> > @@ -52,6 +52,7 @@ static unsigned int domain_rid_bits_defa
> > static unsigned int domain_rid_bits_default = IA64_MIN_IMPL_RID_BITS;
> > integer_param("dom_rid_bits", domain_rid_bits_default);
> >
> > +DEFINE_PER_CPU(unsigned long, domain_shared_info);
> > DEFINE_PER_CPU(unsigned long, inserted_vhpt);
> > DEFINE_PER_CPU(unsigned long, inserted_shared_info);
> > DEFINE_PER_CPU(unsigned long, inserted_mapped_regs);
> > @@ -270,6 +271,8 @@ int set_one_rr(unsigned long rr, unsigne
> > if (!PSCB(v,metaphysical_mode))
> > set_rr(rr,newrrv.rrval);
> > } else if (rreg == 7) {
> > + __get_cpu_var(domain_shared_info) =
> > + (unsigned long)v->domain->shared_info;
> > #if VHPT_ENABLED
> > __get_cpu_var(inserted_vhpt) = __va_ul(vcpu_vhpt_maddr(v));
> > #endif
> > diff -r 1970781956c7 xen/include/asm-ia64/linux-xen/asm/mca_asm.h
> > --- a/xen/include/asm-ia64/linux-xen/asm/mca_asm.h Wed Jul 23 12:10:20
> > 2008 +0900
> > +++ b/xen/include/asm-ia64/linux-xen/asm/mca_asm.h Mon Jul 28 11:42:09
> > 2008 +0900
> > @@ -58,8 +58,35 @@
> > #endif
> >
> > #ifdef XEN
> > +/*
> > + * void set_per_cpu_data(*ret)
> > + * {
> > + * int i;
> > + * for (i = 0; i < 64; i++) {
> > + * if (ia64_mca_tlb_list[i].cr_lid == ia64_getreg(_IA64_REG_CR_LID)) {
> > + * *ret = ia64_mca_tlb_list[i].percpu_paddr;
> > + * return;
> > + * }
> > + * }
> > + * while(1); // Endless loop on error
> > + * }
> > + */
> > +#define SET_PER_CPU_DATA(reg,_tmp1,_tmp2,_tmp3) \
> > + LOAD_PHYSICAL(p0,reg,ia64_mca_tlb_list);;\
> > + mov _tmp1 = ar.lc;; \
> > + mov ar.lc = NR_CPUS-1; \
> > + mov _tmp2 = cr.lid;; \
> > +10: ld8 _tmp3 = [reg],16;; \
> > + cmp.ne p6, p7 = _tmp3, _tmp2;; \
> > +(p7) br.cond.dpnt 30f;; \
> > + br.cloop.sptk.few 10b;; \
> > +20: br 20b;;/* Endless loop on error */ \
> > +30: mov ar.lc = _tmp1; \
> > + adds reg = IA64_MCA_PERCPU_OFFSET-IA64_MCA_TLB_INFO_SIZE, reg;; \
> > + ld8 reg = [reg]
> > +
> > #define GET_THIS_PADDR(reg, var) \
> > - mov reg = IA64_KR(PER_CPU_DATA);; \
> > + SET_PER_CPU_DATA(reg,r5,r6,r7);; \
> > addl reg = THIS_CPU(var) - PERCPU_ADDR, reg
> > #else
> > #define GET_THIS_PADDR(reg, var) \
> > diff -r 1970781956c7 xen/include/asm-ia64/regionreg.h
> > --- a/xen/include/asm-ia64/regionreg.h Wed Jul 23 12:10:20 2008 +0900
> > +++ b/xen/include/asm-ia64/regionreg.h Fri Jul 25 10:36:14 2008 +0900
> > @@ -36,6 +36,7 @@ typedef union ia64_rr {
> > #define RR_RID(arg) (((arg) & 0x0000000000ffffff) << 8)
> > #define RR_RID_MASK 0x00000000ffffff00L
> >
> > +DECLARE_PER_CPU(unsigned long, domain_shared_info);
> > DECLARE_PER_CPU(unsigned long, inserted_vhpt);
> > DECLARE_PER_CPU(unsigned long, inserted_shared_info);
> > DECLARE_PER_CPU(unsigned long, inserted_mapped_regs);
>
> > _______________________________________________
> > Xen-ia64-devel mailing list
> > Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-ia64-devel
>
--
yamahata
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