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openSUSE:12.2
xen
25191-x86-tdt-delta-calculation.patch
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File 25191-x86-tdt-delta-calculation.patch of Package xen
# HG changeset patch # User David Vrabel <david.vrabel@citrix.com> # Date 1334159385 -3600 # Node ID a95fc7decc831a01ed43c307c52287b32e7f4832 # Parent d196634484a9f86136704f973293925445961079 x86: fix delta calculation in TSC deadline timer emulation In the virtual LAPIC, correct the delta calculation when emulating the TSC deadline timer. Without this fix, XenServer (which is based on Xen 4.1) does not work when running as an HVM guest. dom0 fails to boot because its timer interrupts are very delayed (by several minutes in some cases). Signed-off-by: David Vrabel <david.vrabel@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com> Committed-by: Keir Fraser <keir@xen.org> --- a/xen/arch/x86/hvm/vlapic.c +++ b/xen/arch/x86/hvm/vlapic.c @@ -889,7 +889,6 @@ uint64_t vlapic_tdt_msr_get(struct vlap void vlapic_tdt_msr_set(struct vlapic *vlapic, uint64_t value) { uint64_t guest_tsc; - uint64_t guest_time; struct vcpu *v = vlapic_vcpu(vlapic); /* may need to exclude some other conditions like vlapic->hw.disabled */ @@ -901,12 +900,10 @@ void vlapic_tdt_msr_set(struct vlapic *v /* new_value = 0, >0 && <= now, > now */ guest_tsc = hvm_get_guest_tsc(v); - guest_time = hvm_get_guest_time(v); if ( value > guest_tsc ) { - uint64_t delta = value - v->arch.hvm_vcpu.cache_tsc_offset; - delta = gtsc_to_gtime(v->domain, delta); - delta = max_t(s64, delta - guest_time, 0); + uint64_t delta = gtsc_to_gtime(v->domain, value - guest_tsc); + delta = max_t(s64, delta, 0); HVM_DBG_LOG(DBG_LEVEL_VLAPIC_TIMER, "delta[0x%016"PRIx64"]", delta); @@ -940,9 +937,8 @@ void vlapic_tdt_msr_set(struct vlapic *v HVM_DBG_LOG(DBG_LEVEL_VLAPIC_TIMER, "tdt_msr[0x%016"PRIx64"]," - " gtsc[0x%016"PRIx64"]," - " gtime[0x%016"PRIx64"]", - vlapic->hw.tdt_msr, guest_tsc, guest_time); + " gtsc[0x%016"PRIx64"]", + vlapic->hw.tdt_msr, guest_tsc); } static int __vlapic_accept_pic_intr(struct vcpu *v)
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