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ANDROID: arm64: virt: Invalidate tlb once the balloon before reporting/inflating

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Instead of invalidating the tlb of the guest every page it relinquishes,
invalidate once before the host is informed about the free pages.

Bug: 315173520
Change-Id: I8450fd552a27dfc791efa15e884982aeedaa3234
Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
Signed-off-by: Elliot Berman <elliot.berman@oss.qualcomm.com>
This commit is contained in:
Prakruthi Deepak Heragu
2025-03-11 13:37:01 -07:00
committed by Todd Kjos
parent 849c862ab9
commit d3c5649103
2 changed files with 12 additions and 0 deletions
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drivers/virtio/virtio_balloon.c
+4
View File
@@ -187,6 +187,8 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq)
sg_init_one(&sg, vb->pfns, sizeof(vb->pfns[0]) * vb->num_pfns);
post_page_relinquish_tlb_inv();
/* We should always be able to add one buffer to an empty queue. */
virtqueue_add_outbuf(vq, &sg, 1, vb, GFP_KERNEL);
virtqueue_kick(vq);
@@ -219,6 +221,8 @@ static int virtballoon_free_page_report(struct page_reporting_dev_info *pr_dev_i
if (WARN_ON_ONCE(err))
return err;
post_page_relinquish_tlb_inv();
virtqueue_kick(vq);
/* When host has read buffer, this completes via balloon_ack */
include/linux/virtio_balloon.h
+8
View File
@@ -16,6 +16,7 @@ struct page;
struct virtio_balloon_hyp_ops {
bool (*page_relinquish_disallowed)(void);
void (*page_relinquish)(struct page *page, unsigned int nr);
void (*post_page_relinquish_tlb_inv)(void);
};
extern struct virtio_balloon_hyp_ops *virtio_balloon_hyp_ops;
@@ -35,10 +36,17 @@ static inline void page_relinquish(struct page *page, unsigned int nr)
return virtio_balloon_hyp_ops->page_relinquish(page, nr);
}
static inline void post_page_relinquish_tlb_inv(void)
{
if (virtio_balloon_hyp_ops &&
virtio_balloon_hyp_ops->post_page_relinquish_tlb_inv)
return virtio_balloon_hyp_ops->post_page_relinquish_tlb_inv();
}
#else /* !CONFIG_VIRTIO_BALLOON_HYP_OPS */
static inline bool page_relinquish_disallowed(void) { return false; }
static inline void page_relinquish(struct page *page, unsigned int nr) { }
static inline void post_page_relinquish_tlb_inv(void) { }
#endif /* CONFIG_VIRTIO_BALLOON_HYP_OPS */