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Re: [Xen-devel] [PATCH] x86/vvmx: virtualize x2APIC mode and APIC accesses can't both be enabled
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 24 Dec 2019 15:34:12 +0000
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- Cc: Wei Liu <wl@xxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>
- Delivery-date: Tue, 24 Dec 2019 15:34:29 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 24/12/2019 15:32, Roger Pau Monne wrote:
> According to the Intel SDM, "virtualize x2APIC mode" and "virtualize
> APIC accesses" can't be enabled at the same time, or else a
> vm{launch/entry} failure will happen. This was seen when running Xen
> nested and with x2APIC enabled:
>
> Dec 23 20:06:54.444025 (XEN) d3v0 VMLAUNCH error: 0x7
> [...]
> Dec 23 20:08:33.004078 (XEN) *** Control State ***
> Dec 23 20:08:33.004086 (XEN) PinBased=0000003f CPUBased=b6a075fe
> SecondaryExec=000014fb
> [...]
>
> Fix this by making sure nvmx_update_secondary_exec_control clears the
> incompatible bits from the host vmcs before merging it with the nested
> vmcs.
>
> This fixes a regression reported by osstest in the
> test-amd64-amd64-qemuu-nested-intel job.
>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> xen/arch/x86/hvm/vmx/vvmx.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
> index 5dd00e11b5..d8ab167d62 100644
> --- a/xen/arch/x86/hvm/vmx/vvmx.c
> +++ b/xen/arch/x86/hvm/vmx/vvmx.c
> @@ -594,6 +594,7 @@ void nvmx_update_secondary_exec_control(struct vcpu *v,
> u32 shadow_cntrl;
> struct nestedvmx *nvmx = &vcpu_2_nvmx(v);
> u32 apicv_bit = SECONDARY_EXEC_APIC_REGISTER_VIRT |
> + SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
> SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY;
>
> host_cntrl &= ~apicv_bit;
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