linux-kernel - Re: [PATCH] x86/Hyper-V: Fix definition HV_MAX_FLUSH_REP

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Date:   Fri, 15 Mar 2019 18:45:32 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     lantianyu1986@...il.com
Cc:     Lan Tianyu <Tianyu.Lan@...rosoft.com>, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, sashal@...nel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        x86@...nel.org, rkrcmar@...hat.com, devel@...uxdriverproject.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        michael.h.kelley@...rosoft.com, vkuznets@...hat.com,
        stable@...r.kernel.org
Subject: Re: [PATCH] x86/Hyper-V: Fix definition HV_MAX_FLUSH_REP_COUNT

On 22/02/19 11:48, lantianyu1986@...il.com wrote:
> From: Lan Tianyu <Tianyu.Lan@...rosoft.com>
> 
> The max flush rep count of HvFlushGuestPhysicalAddressList hypercall
> is equal with how many entries of union hv_gpa_page_range can be populated
> into the input parameter page. The origin code lacks parenthesis around
> PAGE_SIZE - 2 * sizeof(u64). This patch is to fix it.
> 
> Cc: <stable@...r.kernel.org>
> Fixs: cc4edae4b9(x86/hyper-v: Add HvFlushGuestAddressList hypercall support)
> Signed-off-by: Lan Tianyu <Tianyu.Lan@...rosoft.com>
> ---
>  arch/x86/include/asm/hyperv-tlfs.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
> index 705dafc2d11a..2bdbbbcfa393 100644
> --- a/arch/x86/include/asm/hyperv-tlfs.h
> +++ b/arch/x86/include/asm/hyperv-tlfs.h
> @@ -841,7 +841,7 @@ union hv_gpa_page_range {
>   * count is equal with how many entries of union hv_gpa_page_range can
>   * be populated into the input parameter page.
>   */
> -#define HV_MAX_FLUSH_REP_COUNT (PAGE_SIZE - 2 * sizeof(u64) /	\
> +#define HV_MAX_FLUSH_REP_COUNT ((PAGE_SIZE - 2 * sizeof(u64)) /	\
>  				sizeof(union hv_gpa_page_range))
>  
>  struct hv_guest_mapping_flush_list {
> 

Queued for after he merge window, with the fixed "Fixes" tag.

Paolo