[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-3.1-testing] x86: Fix HVM hypercall preemption causing guest crash.
# HG changeset patch # User Keir Fraser <keir.fraser@xxxxxxxxxx> # Date 1201620464 0 # Node ID d03ed9c63d33012d96ecab3a54fcb8e971e47806 # Parent ef03fdafc731675cbb673c737c522d25f5ef84bf x86: Fix HVM hypercall preemption causing guest crash. Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx> xen-unstable changeset: 16929:128f7bc0a277375571b4817fc65bfcd14e00a7ec xen-unstable date: Tue Jan 29 11:47:42 2008 +0000 --- xen/arch/x86/domain.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletion(-) diff -r ef03fdafc731 -r d03ed9c63d33 xen/arch/x86/domain.c --- a/xen/arch/x86/domain.c Mon Jan 28 10:42:14 2008 +0000 +++ b/xen/arch/x86/domain.c Tue Jan 29 15:27:44 2008 +0000 @@ -1388,7 +1388,12 @@ unsigned long hypercall_create_continuat { regs = guest_cpu_user_regs(); regs->eax = op; - regs->eip -= 2; /* re-execute 'syscall' / 'int 0x82' */ + /* + * For PV guest, we update EIP to re-execute 'syscall' / 'int 0x82'; + * HVM does not need this since 'vmcall' / 'vmmcall' is fault-like. + */ + if ( !is_hvm_vcpu(current) ) + regs->eip -= 2; /* re-execute 'syscall' / 'int 0x82' */ #ifdef __x86_64__ if ( !is_hvm_vcpu(current) ? _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
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