Commit 5202397d authored by Chris Wright's avatar Chris Wright Committed by Avi Kivity
Browse files

KVM guest: remove KVM guest pv mmu support 



This has not been used for some years now.  It's time to remove it.

Signed-off-by: default avatarChris Wright <chrisw@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 1a214246

arch/x86/kernel/kvm.c

+0 −181
Original line number Diff line number Diff line
@@ -39,8 +39,6 @@ 
#include <asm/desc.h>

#include <asm/tlbflush.h>



#define MMU_QUEUE_SIZE 1024



static int kvmapf = 1;



static int parse_no_kvmapf(char *arg)
@@ -60,21 +58,10 @@ static int parse_no_stealacc(char *arg) 


early_param("no-steal-acc", parse_no_stealacc);



struct kvm_para_state {

	u8 mmu_queue[MMU_QUEUE_SIZE];

	int mmu_queue_len;

};



static DEFINE_PER_CPU(struct kvm_para_state, para_state);

static DEFINE_PER_CPU(struct kvm_vcpu_pv_apf_data, apf_reason) __aligned(64);

static DEFINE_PER_CPU(struct kvm_steal_time, steal_time) __aligned(64);

static int has_steal_clock = 0;



static struct kvm_para_state *kvm_para_state(void)

{

	return &per_cpu(para_state, raw_smp_processor_id());

}



/*

 * No need for any "IO delay" on KVM

 */
@@ -271,151 +258,6 @@ do_async_page_fault(struct pt_regs *regs, unsigned long error_code) 
	}

}



static void kvm_mmu_op(void *buffer, unsigned len)

{

	int r;

	unsigned long a1, a2;



	do {

		a1 = __pa(buffer);

		a2 = 0;   /* on i386 __pa() always returns <4G */

		r = kvm_hypercall3(KVM_HC_MMU_OP, len, a1, a2);

		buffer += r;

		len -= r;

	} while (len);

}



static void mmu_queue_flush(struct kvm_para_state *state)

{

	if (state->mmu_queue_len) {

		kvm_mmu_op(state->mmu_queue, state->mmu_queue_len);

		state->mmu_queue_len = 0;

	}

}



static void kvm_deferred_mmu_op(void *buffer, int len)

{

	struct kvm_para_state *state = kvm_para_state();



	if (paravirt_get_lazy_mode() != PARAVIRT_LAZY_MMU) {

		kvm_mmu_op(buffer, len);

		return;

	}

	if (state->mmu_queue_len + len > sizeof state->mmu_queue)

		mmu_queue_flush(state);

	memcpy(state->mmu_queue + state->mmu_queue_len, buffer, len);

	state->mmu_queue_len += len;

}



static void kvm_mmu_write(void *dest, u64 val)

{

	__u64 pte_phys;

	struct kvm_mmu_op_write_pte wpte;



#ifdef CONFIG_HIGHPTE

	struct page *page;

	unsigned long dst = (unsigned long) dest;



	page = kmap_atomic_to_page(dest);

	pte_phys = page_to_pfn(page);

	pte_phys <<= PAGE_SHIFT;

	pte_phys += (dst & ~(PAGE_MASK));

#else

	pte_phys = (unsigned long)__pa(dest);

#endif

	wpte.header.op = KVM_MMU_OP_WRITE_PTE;

	wpte.pte_val = val;

	wpte.pte_phys = pte_phys;



	kvm_deferred_mmu_op(&wpte, sizeof wpte);

}



/*

 * We only need to hook operations that are MMU writes.  We hook these so that

 * we can use lazy MMU mode to batch these operations.  We could probably

 * improve the performance of the host code if we used some of the information

 * here to simplify processing of batched writes.

 */

static void kvm_set_pte(pte_t *ptep, pte_t pte)

{

	kvm_mmu_write(ptep, pte_val(pte));

}



static void kvm_set_pte_at(struct mm_struct *mm, unsigned long addr,

			   pte_t *ptep, pte_t pte)

{

	kvm_mmu_write(ptep, pte_val(pte));

}



static void kvm_set_pmd(pmd_t *pmdp, pmd_t pmd)

{

	kvm_mmu_write(pmdp, pmd_val(pmd));

}



#if PAGETABLE_LEVELS >= 3

#ifdef CONFIG_X86_PAE

static void kvm_set_pte_atomic(pte_t *ptep, pte_t pte)

{

	kvm_mmu_write(ptep, pte_val(pte));

}



static void kvm_pte_clear(struct mm_struct *mm,

			  unsigned long addr, pte_t *ptep)

{

	kvm_mmu_write(ptep, 0);

}



static void kvm_pmd_clear(pmd_t *pmdp)

{

	kvm_mmu_write(pmdp, 0);

}

#endif



static void kvm_set_pud(pud_t *pudp, pud_t pud)

{

	kvm_mmu_write(pudp, pud_val(pud));

}



#if PAGETABLE_LEVELS == 4

static void kvm_set_pgd(pgd_t *pgdp, pgd_t pgd)

{

	kvm_mmu_write(pgdp, pgd_val(pgd));

}

#endif

#endif /* PAGETABLE_LEVELS >= 3 */



static void kvm_flush_tlb(void)

{

	struct kvm_mmu_op_flush_tlb ftlb = {

		.header.op = KVM_MMU_OP_FLUSH_TLB,

	};



	kvm_deferred_mmu_op(&ftlb, sizeof ftlb);

}



static void kvm_release_pt(unsigned long pfn)

{

	struct kvm_mmu_op_release_pt rpt = {

		.header.op = KVM_MMU_OP_RELEASE_PT,

		.pt_phys = (u64)pfn << PAGE_SHIFT,

	};



	kvm_mmu_op(&rpt, sizeof rpt);

}



static void kvm_enter_lazy_mmu(void)

{

	paravirt_enter_lazy_mmu();

}



static void kvm_leave_lazy_mmu(void)

{

	struct kvm_para_state *state = kvm_para_state();



	mmu_queue_flush(state);

	paravirt_leave_lazy_mmu();

}



static void __init paravirt_ops_setup(void)

{

	pv_info.name = "KVM";
@@ -424,29 +266,6 @@ static void __init paravirt_ops_setup(void) 
	if (kvm_para_has_feature(KVM_FEATURE_NOP_IO_DELAY))

		pv_cpu_ops.io_delay = kvm_io_delay;



	if (kvm_para_has_feature(KVM_FEATURE_MMU_OP)) {

		pv_mmu_ops.set_pte = kvm_set_pte;

		pv_mmu_ops.set_pte_at = kvm_set_pte_at;

		pv_mmu_ops.set_pmd = kvm_set_pmd;

#if PAGETABLE_LEVELS >= 3

#ifdef CONFIG_X86_PAE

		pv_mmu_ops.set_pte_atomic = kvm_set_pte_atomic;

		pv_mmu_ops.pte_clear = kvm_pte_clear;

		pv_mmu_ops.pmd_clear = kvm_pmd_clear;

#endif

		pv_mmu_ops.set_pud = kvm_set_pud;

#if PAGETABLE_LEVELS == 4

		pv_mmu_ops.set_pgd = kvm_set_pgd;

#endif

#endif

		pv_mmu_ops.flush_tlb_user = kvm_flush_tlb;

		pv_mmu_ops.release_pte = kvm_release_pt;

		pv_mmu_ops.release_pmd = kvm_release_pt;

		pv_mmu_ops.release_pud = kvm_release_pt;



		pv_mmu_ops.lazy_mode.enter = kvm_enter_lazy_mmu;

		pv_mmu_ops.lazy_mode.leave = kvm_leave_lazy_mmu;

	}

#ifdef CONFIG_X86_IO_APIC

	no_timer_check = 1;

#endif