From: Avi Kivity Subject: [PATCH 092/104] KVM: VMX: Fix exit qualification width on i386 Date: Mon, 17 Sep 2007 10:32:14 +0200 Message-ID: <11900179493319-git-send-email-avi@qumranet.com> References: <11900179463203-git-send-email-avi@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, "He, Qing" To: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Return-path: In-Reply-To: <11900179463203-git-send-email-avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org From: He, Qing According to Intel Software Developer's Manual, Vol. 3B, Appendix H.4.2, exit qualification should be of natural width. However, current code uses u64 as the data type for this register, which occasionally introduces invalid value to VMExit handling logics. This patch fixes this bug. I have tested Windows and Linux guest on i386 host, and they can boot successfully with this patch. Signed-off-by: Qing He Signed-off-by: Avi Kivity --- drivers/kvm/vmx.c | 12 ++++++------ 1 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index fa4277d..c44c9ac 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -1840,12 +1840,12 @@ static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { - u64 exit_qualification; + unsigned long exit_qualification; int size, down, in, string, rep; unsigned port; ++vcpu->stat.io_exits; - exit_qualification = vmcs_read64(EXIT_QUALIFICATION); + exit_qualification = vmcs_readl(EXIT_QUALIFICATION); string = (exit_qualification & 16) != 0; if (string) { @@ -1877,11 +1877,11 @@ vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall) static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { - u64 exit_qualification; + unsigned long exit_qualification; int cr; int reg; - exit_qualification = vmcs_read64(EXIT_QUALIFICATION); + exit_qualification = vmcs_readl(EXIT_QUALIFICATION); cr = exit_qualification & 15; reg = (exit_qualification >> 8) & 15; switch ((exit_qualification >> 4) & 3) { @@ -1950,7 +1950,7 @@ static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { - u64 exit_qualification; + unsigned long exit_qualification; unsigned long val; int dr, reg; @@ -1958,7 +1958,7 @@ static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) * FIXME: this code assumes the host is debugging the guest. * need to deal with guest debugging itself too. */ - exit_qualification = vmcs_read64(EXIT_QUALIFICATION); + exit_qualification = vmcs_readl(EXIT_QUALIFICATION); dr = exit_qualification & 7; reg = (exit_qualification >> 8) & 15; vcpu_load_rsp_rip(vcpu); -- 1.5.3 ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/