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arm: KVM: Add optimized PIPT icache flushing

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Calling __cpuc_coherent_user_range to invalidate the icache on
a PIPT icache machine has some pointless overhead, as it starts
by cleaning the dcache to the PoU, while we're guaranteed to
have already cleaned it to the PoC.

As KVM is the only user of such a feature, let's implement some
ad-hoc cache flushing in kvm_mmu.h. Should it become useful to
other subsystems, it can be moved to a more global location.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Marc Zyngier 2017-10-23 17:11:17 +01:00 committed by Christoffer Dall
parent 4fee947366
commit 91c703e038
2 changed files with 31 additions and 3 deletions
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2
arch/arm/include/asm/kvm_hyp.h
View file

@ -68,6 +68,8 @@
#define HIFAR __ACCESS_CP15(c6, 4, c0, 2)
#define HPFAR __ACCESS_CP15(c6, 4, c0, 4)
#define ICIALLUIS __ACCESS_CP15(c7, 0, c1, 0)
#define BPIALLIS __ACCESS_CP15(c7, 0, c1, 6)
#define ICIMVAU __ACCESS_CP15(c7, 0, c5, 1)
#define ATS1CPR __ACCESS_CP15(c7, 0, c8, 0)
#define TLBIALLIS __ACCESS_CP15(c8, 0, c3, 0)
#define TLBIALL __ACCESS_CP15(c8, 0, c7, 0)

32
arch/arm/include/asm/kvm_mmu.h
View file

@ -37,6 +37,8 @@
#include <linux/highmem.h>
#include <asm/cacheflush.h>
#include <asm/cputype.h>
#include <asm/kvm_hyp.h>
#include <asm/pgalloc.h>
#include <asm/stage2_pgtable.h>
@ -157,6 +159,8 @@ static inline void __invalidate_icache_guest_page(struct kvm_vcpu *vcpu,
kvm_pfn_t pfn,
unsigned long size)
{
u32 iclsz;
/*
* If we are going to insert an instruction page and the icache is
* either VIPT or PIPT, there is a potential problem where the host
@ -181,18 +185,40 @@ static inline void __invalidate_icache_guest_page(struct kvm_vcpu *vcpu,
return;
}
/* PIPT cache. As for the d-side, use a temporary kernel mapping. */
/*
* CTR IminLine contains Log2 of the number of words in the
* cache line, so we can get the number of words as
* 2 << (IminLine - 1). To get the number of bytes, we
* multiply by 4 (the number of bytes in a 32-bit word), and
* get 4 << (IminLine).
*/
iclsz = 4 << (read_cpuid(CPUID_CACHETYPE) & 0xf);
while (size) {
void *va = kmap_atomic_pfn(pfn);
void *end = va + PAGE_SIZE;
void *addr = va;
__cpuc_coherent_user_range((unsigned long)va,
(unsigned long)va + PAGE_SIZE);
do {
write_sysreg(addr, ICIMVAU);
addr += iclsz;
} while (addr < end);
dsb(ishst);
isb();
size -= PAGE_SIZE;
pfn++;
kunmap_atomic(va);
}
/* Check if we need to invalidate the BTB */
if ((read_cpuid_ext(CPUID_EXT_MMFR1) >> 28) != 4) {
write_sysreg(0, BPIALLIS);
dsb(ishst);
isb();
}
}
static inline void __kvm_flush_dcache_pte(pte_t pte)