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Re: [Xen-devel] [PATCH v2 2/5] x86/domain: Initialise vcpu debug registers correctly
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 26 Oct 2018 15:51:53 +0100
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 26 Oct 2018 14:52:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
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On 26/10/2018 15:37, Jan Beulich wrote:
On 26.10.18 at 16:22, <andrew.cooper3@xxxxxxxxxx> wrote:
On 26/10/2018 14:31, Jan Beulich wrote:
On 15.10.18 at 12:36, <andrew.cooper3@xxxxxxxxxx> wrote:
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -323,6 +323,18 @@ void free_vcpu_struct(struct vcpu *v)
free_xenheap_page(v);
}
+/* Initialise various registers to their architectural INIT/RESET state. */
+void arch_vcpu_regs_init(struct vcpu *v)
+{
+ v->arch.user_regs = (typeof(v->arch.user_regs)){
+ .rflags = X86_EFLAGS_MBS,
+ };
Sadly this initializer broke the build once again for gcc 4.3.x.
Oh - that's unfortunate. I guess it will need a memset instead.
Or we finally need to bump the minimum version we're happy with.
(As a side note, using .eflags instead of .rflags would have a
fair chance of an omitted REX prefix.)
You specifically requested rflags over eflags in your previous review.
Did I? I haven't been able to find v1 of this patch at all in the archives
(going back to May), or in my inbox (using just part of the title for
searching). Was that posted in private, or under a different title? I'm
trying to figure why I would have asked for that...
<5B17E80A02000078001C8C1D@xxxxxxxxxxxxxxxxxxxxxxxx>
This series is the fairly non-controversial parts of the original full series, because there is no point delaying getting it in. I'm still fighting with the monitor framework, which is a prerequisite to being able to fix #DB injection in the VT-x and SVM code.
~Andrew
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