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ANDROID: KVM: arm64: Allocate memory at hyp for host sve state

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Allocate memory and donate it to hyp at setup time for tracking
the host sve state at hyp in protected mode. This memory is used
in the subsequent patch.

Signed-off-by: Fuad Tabba <tabba@google.com>

Bug: 267291591
Change-Id: If07eec9ea9c7b216d02e2d1ea69bd62d99f08081
This commit is contained in:
Fuad Tabba 2023-03-13 15:00:56 +00:00 committed by Lee Jones
parent a752b269cb
commit 6a8b1d4934
1 changed files with 28 additions and 2 deletions
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30
arch/arm64/include/asm/kvm_pkvm.h
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@ -13,6 +13,23 @@
#include <asm/kvm_pgtable.h>
#include <asm/sysreg.h>
/*
* Stores the sve state for the host in protected mode.
*/
struct kvm_host_sve_state {
u64 zcr_el1;
/*
* Ordering is important since __sve_save_state/__sve_restore_state
* relies on it.
*/
u32 fpsr;
u32 fpcr;
/* Must be SVE_VQ_BYTES (128 bit) aligned. */
char sve_regs[];
};
/* Maximum number of VMs that can co-exist under pKVM. */
#define KVM_MAX_PVMS 255
@ -385,10 +402,19 @@ static inline unsigned long hyp_ffa_proxy_pages(void)
return (2 * KVM_FFA_MBOX_NR_PAGES) + DIV_ROUND_UP(desc_max, PAGE_SIZE);
}
static inline size_t pkvm_host_fp_state_size(void)
{
if (system_supports_sve())
return size_add(sizeof(struct kvm_host_sve_state),
SVE_SIG_REGS_SIZE(sve_vq_from_vl(kvm_host_sve_max_vl)));
else
return sizeof(struct user_fpsimd_state);
}
static inline unsigned long hyp_host_fp_pages(unsigned long nr_cpus)
{
return PAGE_ALIGN(nr_cpus * sizeof(struct user_fpsimd_state)) >>
PAGE_SHIFT;
return PAGE_ALIGN(size_mul(nr_cpus, pkvm_host_fp_state_size())) >>
PAGE_SHIFT;
}
#endif /* __ARM64_KVM_PKVM_H__ */