diff options
| author | Quentin Perret <qperret@google.com> | 2023-05-23 13:18:27 +0300 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2023-06-02 00:34:51 +0300 |
| commit | 0a9f15fd56742b785ba4d06e64976f1f700b807c (patch) | |
| tree | d2b9f6169d0a8ea61e8feb6322e99247635fc853 /arch/arm64/include/asm/kvm_pkvm.h | |
| parent | 20936cd11479709ccd5de2dc77ac8063cd9bfad8 (diff) | |
| download | linux-0a9f15fd56742b785ba4d06e64976f1f700b807c.tar.xz | |
KVM: arm64: pkvm: Add support for fragmented FF-A descriptors
FF-A memory descriptors may need to be sent in fragments when they don't
fit in the mailboxes. Doing so involves using the FRAG_TX and FRAG_RX
primitives defined in the FF-A protocol.
Add support in the pKVM FF-A relayer for fragmented descriptors by
monitoring outgoing FRAG_TX transactions and by buffering large
descriptors on the reclaim path.
Co-developed-by: Andrew Walbran <qwandor@google.com>
Signed-off-by: Andrew Walbran <qwandor@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20230523101828.7328-11-will@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'arch/arm64/include/asm/kvm_pkvm.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_pkvm.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/kvm_pkvm.h b/arch/arm64/include/asm/kvm_pkvm.h index 2b495ec59deb..e46250a02017 100644 --- a/arch/arm64/include/asm/kvm_pkvm.h +++ b/arch/arm64/include/asm/kvm_pkvm.h @@ -6,7 +6,9 @@ #ifndef __ARM64_KVM_PKVM_H__ #define __ARM64_KVM_PKVM_H__ +#include <linux/arm_ffa.h> #include <linux/memblock.h> +#include <linux/scatterlist.h> #include <asm/kvm_pgtable.h> /* Maximum number of VMs that can co-exist under pKVM. */ @@ -110,8 +112,19 @@ static inline unsigned long host_s2_pgtable_pages(void) static inline unsigned long hyp_ffa_proxy_pages(void) { - /* A page each for the hypervisor's RX and TX mailboxes. */ - return 2 * KVM_FFA_MBOX_NR_PAGES; + size_t desc_max; + + /* + * The hypervisor FFA proxy needs enough memory to buffer a fragmented + * descriptor returned from EL3 in response to a RETRIEVE_REQ call. + */ + desc_max = sizeof(struct ffa_mem_region) + + sizeof(struct ffa_mem_region_attributes) + + sizeof(struct ffa_composite_mem_region) + + SG_MAX_SEGMENTS * sizeof(struct ffa_mem_region_addr_range); + + /* Plus a page each for the hypervisor's RX and TX mailboxes. */ + return (2 * KVM_FFA_MBOX_NR_PAGES) + DIV_ROUND_UP(desc_max, PAGE_SIZE); } #endif /* __ARM64_KVM_PKVM_H__ */ |