linux-kernel - Re: [PATCH 1/3] kvm: mmu: Replace unsigned with unsigned int for PTE access

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Date:   Wed, 05 Feb 2020 13:00:11 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Ben Gardon <bgardon@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Peter Xu <peterx@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Peter Shier <pshier@...gle.com>,
        Oliver Upton <oupton@...gle.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 1/3] kvm: mmu: Replace unsigned with unsigned int for PTE access

Ben Gardon <bgardon@...gle.com> writes:

> There are several functions which pass an access permission mask for
> SPTEs as an unsigned. This works, but checkpatch complains about it.
> Switch the occurrences of unsigned to unsigned int to satisfy checkpatch.
>
> No functional change expected.
>
> Tested by running kvm-unit-tests on an Intel Haswell machine. This
> commit introduced no new failures.
>
> This commit can be viewed in Gerrit at:
> 	https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2358
>
> Signed-off-by: Ben Gardon <bgardon@...gle.com>
> Reviewed-by: Oliver Upton <oupton@...gle.com>
> ---
>  arch/x86/kvm/mmu/mmu.c | 24 +++++++++++++-----------
>  1 file changed, 13 insertions(+), 11 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 84eeb61d06aa3..a9c593dec49bf 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -452,7 +452,7 @@ static u64 get_mmio_spte_generation(u64 spte)
>  }
>  
>  static void mark_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, u64 gfn,
> -			   unsigned access)
> +			   unsigned int access)
>  {
>  	u64 gen = kvm_vcpu_memslots(vcpu)->generation & MMIO_SPTE_GEN_MASK;
>  	u64 mask = generation_mmio_spte_mask(gen);
> @@ -484,7 +484,7 @@ static unsigned get_mmio_spte_access(u64 spte)
>  }
>  
>  static bool set_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn,
> -			  kvm_pfn_t pfn, unsigned access)
> +			  kvm_pfn_t pfn, unsigned int access)
>  {
>  	if (unlikely(is_noslot_pfn(pfn))) {
>  		mark_mmio_spte(vcpu, sptep, gfn, access);
> @@ -2475,7 +2475,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
>  					     gva_t gaddr,
>  					     unsigned level,
>  					     int direct,
> -					     unsigned access)
> +					     unsigned int access)
>  {
>  	union kvm_mmu_page_role role;
>  	unsigned quadrant;
> @@ -2990,7 +2990,7 @@ static bool kvm_is_mmio_pfn(kvm_pfn_t pfn)
>  #define SET_SPTE_NEED_REMOTE_TLB_FLUSH	BIT(1)
>  
>  static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
> -		    unsigned pte_access, int level,
> +		    unsigned int pte_access, int level,
>  		    gfn_t gfn, kvm_pfn_t pfn, bool speculative,
>  		    bool can_unsync, bool host_writable)
>  {
> @@ -3081,9 +3081,10 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
>  	return ret;
>  }
>  
> -static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, unsigned pte_access,
> -			int write_fault, int level, gfn_t gfn, kvm_pfn_t pfn,
> -		       	bool speculative, bool host_writable)
> +static int mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
> +			unsigned int pte_access, int write_fault, int level,
> +			gfn_t gfn, kvm_pfn_t pfn, bool speculative,
> +			bool host_writable)
>  {
>  	int was_rmapped = 0;
>  	int rmap_count;
> @@ -3165,7 +3166,7 @@ static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu,
>  {
>  	struct page *pages[PTE_PREFETCH_NUM];
>  	struct kvm_memory_slot *slot;
> -	unsigned access = sp->role.access;
> +	unsigned int access = sp->role.access;
>  	int i, ret;
>  	gfn_t gfn;
>  
> @@ -3400,7 +3401,8 @@ static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gfn_t gfn, kvm_pfn_t pfn)
>  }
>  
>  static bool handle_abnormal_pfn(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
> -				kvm_pfn_t pfn, unsigned access, int *ret_val)
> +				kvm_pfn_t pfn, unsigned int access,
> +				int *ret_val)
>  {
>  	/* The pfn is invalid, report the error! */
>  	if (unlikely(is_error_pfn(pfn))) {
> @@ -4005,7 +4007,7 @@ static int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, bool direct)
>  
>  	if (is_mmio_spte(spte)) {
>  		gfn_t gfn = get_mmio_spte_gfn(spte);
> -		unsigned access = get_mmio_spte_access(spte);
> +		unsigned int access = get_mmio_spte_access(spte);
>  
>  		if (!check_mmio_spte(vcpu, spte))
>  			return RET_PF_INVALID;
> @@ -4349,7 +4351,7 @@ static void inject_page_fault(struct kvm_vcpu *vcpu,
>  }
>  
>  static bool sync_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn,
> -			   unsigned access, int *nr_present)
> +			   unsigned int access, int *nr_present)
>  {
>  	if (unlikely(is_mmio_spte(*sptep))) {
>  		if (gfn != get_mmio_spte_gfn(*sptep)) {

Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.com>

-- 
Vitaly