Re: [Xen-devel] Debugging Windows HVM crashes on Ryzen 3xxx series CPUs.

[Jan Beulich <jbeulich@xxxxxxxx>]

On 25.10.2019 09:00, Steven Haigh wrote:
> Further to my last, I downloaded the latest Windows Server 2016 ISO from 
> Microsoft.
> 
> Filename: Windows_Server_2016_Datacenter_EVAL_en-us_14393_refresh.ISO
> 
> Have attached as much of the log as I could get attempting to boot from 
> the ISO and having a blank LV as the install target.
> 
> The Windows error message (shown via VNC) is HAL MEMORY ALLOCATION.

Hmm, that's as if there was still (again?) an issue with CPUID
handling - iirc the same was observable on maximum-size Rome
systems prior to df29d03f1d (and its fixup). Below the debugging
patch I did use at the time, maybe it turns out helpful here too
(and perhaps you'd really only need the first hunk, I had put in
the other one just in case anyway).

However this looks to be different from your earlier report,
where you said you've got some

(XEN) d1v0 VIRIDIAN CRASH: ac 0 a0a0 fffff8065c06bf88 bf8

So I wonder whether there's a new issue masking the old one.

Jan

--- unstable.orig/xen/arch/x86/hvm/hvm.c
+++ unstable/xen/arch/x86/hvm/hvm.c
@@ -3372,6 +3372,9 @@ int hvm_vmexit_cpuid(struct cpu_user_reg
     }
 
     guest_cpuid(curr, leaf, subleaf, &res);
+if(regs->ax && (regs->eax >> 16) != 0x4000 && (long)regs->rip < 0) {//temp
+ printk("%pv[%08lx]: %08x:%08x=%08x:%08x:%08x:%08x\n", curr, regs->rip, leaf, 
subleaf, res.a, res.b, res.c, res.d);
+}
     HVMTRACE_6D(CPUID, leaf, subleaf, res.a, res.b, res.c, res.d);
 
     regs->rax = res.a;
--- unstable.orig/xen/arch/x86/hvm/svm/svm.c
+++ unstable/xen/arch/x86/hvm/svm/svm.c
@@ -2223,7 +2223,13 @@ static void svm_do_msr_access(struct cpu
 
         rc = hvm_msr_read_intercept(regs->ecx, &msr_content);
         if ( rc == X86EMUL_OKAY )
+{//temp
             msr_split(regs, msr_content);
+ if(regs->ecx == 0xc001100c || regs->ecx == 0xc0011005)
+  printk("%pv[%08lx]: %08x -> %08x:%08x\n", curr, regs->rip, regs->ecx, 
regs->edx, regs->eax);
+} else if(regs->ecx == 0xc001100c || regs->ecx == 0xc0011005) {
+ printk("%pv[%08lx]: %08x -> #GP\n", curr, regs->rip, regs->ecx);
+}
     }
     else
         rc = hvm_msr_write_intercept(regs->ecx, msr_fold(regs), true);

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