ia64/xen-unstable

changeset 18875:05b293d7fbb7

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IA64: make the fpswa emulation keep the previous behaviour.

When fpswa library return statue > 0, keep the previous behavior.
This case should be addressed somehow later, but it seems somewhat
difficult to resolve, so keep the previous behavor for now.
It is assumed that a guest kernel calls fpswa library
without preemption. This assumption breaks if a guest kernel is
preemptive.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Fri Dec 12 10:35:58 2008 +0900 (2008-12-12)
parents 9e0f8f78d37a
children 09c467481a44
files xen/arch/ia64/xen/faults.c xen/arch/ia64/xen/hypercall.c xen/include/asm-ia64/domain.h
line diff
     1.1 --- a/xen/arch/ia64/xen/faults.c	Fri Dec 12 10:34:18 2008 +0900
     1.2 +++ b/xen/arch/ia64/xen/faults.c	Fri Dec 12 10:35:58 2008 +0900
     1.3 @@ -337,6 +337,7 @@ handle_fpu_swa(int fp_fault, struct pt_r
     1.4  			rc = IA64_RETRY;
     1.5  	}
     1.6  	if (rc == IA64_RETRY) {
     1.7 +		PSCBX(current, fpswa_ret) = (fpswa_ret_t){IA64_RETRY, 0, 0, 0};
     1.8  		gdprintk(XENLOG_DEBUG,
     1.9  			 "%s(%s): floating-point bundle at 0x%lx not mapped\n",
    1.10  			 __FUNCTION__, fp_fault ? "fault" : "trap", fault_ip);
    1.11 @@ -347,6 +348,7 @@ handle_fpu_swa(int fp_fault, struct pt_r
    1.12  	                 &isr, &regs->pr, &regs->cr_ifs, regs);
    1.13  
    1.14  	if (ret.status) {
    1.15 +		PSCBX(current, fpswa_ret) = ret;
    1.16  		printk("%s(%s): fp_emulate() returned %ld\n",
    1.17  		       __FUNCTION__, fp_fault ? "fault" : "trap", ret.status);
    1.18  	}

     2.1 --- a/xen/arch/ia64/xen/hypercall.c	Fri Dec 12 10:34:18 2008 +0900
     2.2 +++ b/xen/arch/ia64/xen/hypercall.c	Fri Dec 12 10:35:58 2008 +0900
     2.3 @@ -165,6 +165,13 @@ fw_hypercall_fpswa (struct vcpu *v, stru
     2.4  	struct page_info *hv_page = NULL;
     2.5  	XEN_EFI_RR_DECLARE(rr6, rr7);
     2.6  
     2.7 +	if (unlikely(PSCBX(v, fpswa_ret).status != 0 && 
     2.8 +		     PSCBX(v, fpswa_ret).status != IA64_RETRY)) {
     2.9 +		ret = PSCBX(v, fpswa_ret);
    2.10 +		PSCBX(v, fpswa_ret) = (fpswa_ret_t){0, 0, 0, 0};
    2.11 +		return ret;
    2.12 +	}
    2.13 +
    2.14  	if (!fpswa_interface)
    2.15  		goto error;
    2.16  

     3.1 --- a/xen/include/asm-ia64/domain.h	Fri Dec 12 10:34:18 2008 +0900
     3.2 +++ b/xen/include/asm-ia64/domain.h	Fri Dec 12 10:35:58 2008 +0900
     3.3 @@ -288,6 +288,7 @@ struct arch_vcpu {
     3.4      char irq_new_condition;    // vpsr.i/vtpr change, check for pending VHPI
     3.5      char hypercall_continuation;
     3.6  
     3.7 +    fpswa_ret_t fpswa_ret;     /* save return values of FPSWA emulation */
     3.8      struct timer hlt_timer;
     3.9      struct arch_vmx_struct arch_vmx; /* Virtual Machine Extensions */
    3.10